CVE-2026-30922

highpriority · track · 0EPSS 0.008 · 57 %ileDEEUFRRUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.82% (57th) EPSS
CVSS 7.5 · high
Is it mine?
47 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with "Indefinite Length" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise Module for Public Cloud 15 SP4suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise Module for Python 3 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise Server 15 SP4-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise Server 15 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of SUSE Linux Enterprise Server 15 SP6-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-150400.12.13.1.noarch as component of openSUSE Leap 15.6suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython-pyasn1-0:0.1.9-4.14.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython-pyasn1-0:0.1.9-4.14.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.1.9-4.14.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.1.9-4.14.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Micro 5.2suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Micro 5.3suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Micro 5.4suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Micro 5.5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Server 15 SP4-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Server 15 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython3-pyasn1-0:0.4.2-150000.3.16.1.noarch as component of SUSE Linux Enterprise Server 15 SP6-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-4.1.noarch as component of SUSE Linux Micro 6.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.1-160000.4.1.noarch as component of SUSE Linux Micro 6.2suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.5.0-slfo.1.1_3.1.noarch as component of SUSE Linux Micro 6.1suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.1-160000.4.1.noarch as component of SUSE Linux Enterprise Server 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.1-160000.4.1.noarch as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.6.3-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.6.3-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.6.3-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython311-pyasn1-0:0.6.3-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.3-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.3-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.3-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.3-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedpython313-pyasn1-0:0.6.1-160000.4.1.noarch as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6
v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · SUSE Product Security
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-674USCWE-674USCWE-674USCWE-835USCWE-835US
05

affected products (47)

Products and version ranges known to be affected.

showing 20 of 47
06

advisories (16)

Vendor and ecosystem advisories describing this.

  • SUSE-SU-2026:1075-1Security update for python-pyasn12026-03-26csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:1076-1Security update for python-pyasn12026-03-26csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:1158-1Security update for python-pyasn12026-03-31csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:20821-1Security update for python-pyasn12026-03-24csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:20835-1Security update for python-pyasn12026-03-25csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:20878-1Security update for python-pyasn12026-03-25csaf · suse_csafDE

    Security update for python-pyasn1

  • SUSE-SU-2026:20929-1Security update for python-pyasn12026-03-25csaf · suse_csafDE

    Security update for python-pyasn1

  • WID-SEC-W-2026-0935Red Hat Ansible Automation Platform: Mehrere SchwachstellenDeutsch2026-03-31csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Ansible Automation Platform ausnutzen, um einen Denial of Service Angriff durchzuführen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder Cross-Site-Scripting-Angriffe durchzuführen.

  • WID-SEC-W-2026-1007IBM App Connect Enterprise: Mehrere SchwachstellenDeutsch2026-04-07csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

  • WID-SEC-W-2026-2437Oracle Communications: Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE

    Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

  • WID-SEC-W-2026-2933Splunk SOAR: Mehrere SchwachstellenDeutsch2026-08-19csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Splunk SOAR ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen SQL-Injection Angriff durchzuführen, um einen Cross-Site Scripting Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

  • openSUSE-SU-2026:10393-1python311-pyasn1-0.6.3-1.1 on GA media2026-03-19csaf · suse_csafDE

    python311-pyasn1-0.6.3-1.1 on GA media

  • openSUSE-SU-2026:20418-1Security update for python-pyasn12026-03-25csaf · suse_csafDE

    Security update for python-pyasn1

  • GHSA-jr27-m4p2-rc6rDenial of Service in pyasn1 via Unbounded Recursion2026-03-17ghsa · osvUS

    ### Summary The `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with Indefinite Length (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. ### Details The vulnerability exists because the decoder iterates through the input stream and recursively calls `decodeFun` (the decoding callback) for every nested component found, without tracking or limiting the recursion depth. Vulnerable Code Locations: 1. `indefLenValueDecoder` (Line 998): ```for component in decodeFun(substrate, asn1Spec, allowEoo=True, **options):``` This method handles indefinite-length constructed types. It sits inside a `while True` loop and recursively calls the decoder for every nested tag. 2. `valueDecoder` (Lines 786 and 907): ```for component in decodeFun(substrate, componentType, **options):``` This method handles standard decoding when a schema is present. It contains two distinct recursive calls that lack depth checks: Line 786: Recursively decodes components of `SEQUENCE` or `SET` types. Line 907: Recursively decodes elements of `SEQUENCE OF` or `SET OF` types. 4. `_decodeComponentsSchemaless` (Line 661): ```for component in decodeFun(substrate, **options):``` This method handles decoding when no schema is provided. In all three cases, `decodeFun` is invoked without passing a `depth` parameter or checking against a global `MAX_ASN1_NESTING` limit. ### PoC ``` import sys from pyasn1.codec.ber import decoder sys.setrecursionlimit(100000) print("[*] Generating Recursion Bomb Payload...") depth = 50_000 chunk = b'\x30\x80' payload = chunk * depth print(f"[*] Payload size: {len(payload) / 1024:.2f} KB") print("[*] Triggering Decoder...") try: decoder.decode(payload) except RecursionError: print("[!] Crashed: Recursion Limit Hit") except MemoryError: print("[!] Crashed: Out of Memory") except Exception as e: print(f"[!] Crashed: {e}") ``` ``` [*] Payload size: 9.77 KB [*] Triggering Decoder... [!] Crashed: Recursion Limit Hit ``` ### Impact - This is an unhandled runtime exception that typically terminates the worker process or thread handling the request. This allows a remote attacker to trivially kill service workers with a small payload (<100KB), resulting in a Denial of Service. Furthermore, in environments where recursion limits are increased, this leads to server-wide memory exhaustion. - Service Crash: Any service using `pyasn1` to parse untrusted ASN.1 data (e.g., LDAP, SNMP, Kerberos, X.509 parsers) can be crashed remotely. - Resource Exhaustion: The attack consumes RAM linearly with the nesting depth. A small payload (<200KB) can consume hundreds of megabytes of RAM or exhaust the stack. ### Credits Vulnerability discovered by Kevin Tu of TMIR at ByteDance.

  • CERTFR-2026-AVI-1378Multiples vulnérabilités dans les produits IBMFrançais2026-10-23vendor · certfrFR
  • PYSEC-2026-22632026-03-18vendor · osvUS

    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with "Indefinite Length" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.

07

also known as (7)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvcert_bundsuse_csafcertfrNVDCVE.orgMITRE
published 2026-03-18modified 2026-09-10
09

references (50)

External citations — patches, advisories, analysis.

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