CVE-2023-46136

highpriority · track · 40EPSS 0.011 · 65 %ileexploit · PoCDEEUNLRUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
1.07% (65th) EPSS
CVSS 7.5 · high
Is it mine?
97 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-22

Werkzeug is a comprehensive WSGI web application library. In versions on the 3.x branch prior to 3.0.1 and on the 2.x branch prior to 2.3.8, if an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1 and 2.3.8.

01

cvss

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

8.0
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.7–8

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 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
v3.18highCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.18highCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · security-advisories@github.comexploitability 2.1 · impact 5.9
v3.15.7mediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV
v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)
v3.18highCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL
02

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-400USCWE-400USCWE-407USCWE-407USCWE-787USCWE-787US
03

exploits (1)

Public proof-of-concept and weaponised exploit code.

04

affected products (97)

Products and version ranges known to be affected.

showing 20 of 97
05

advisories (7)

Vendor and ecosystem advisories describing this.

  • NCSC-2024-0414Kwetsbaarheden verholpen in Oracle CommunicationsNL2024-10-17csaf · ncsc_nlNL

    Oracle heeft kwetsbaarheden verholpen in diverse Communications producten en systemen.

  • WID-SEC-W-2023-3024Red Hat OpenShift: Schwachstelle ermöglicht Denial of ServiceDeutsch2023-11-28csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat OpenShift ausnutzen, um einen Denial of Service Angriff durchzuführen.

  • WID-SEC-W-2024-0662IBM InfoSphere Information Server: Mehrere SchwachstellenDeutsch2024-03-19csaf · cert_bundDE

    Ein entfernter, authentifizierter Angreifer kann mehrere Schwachstellen in IBM InfoSphere Information Server ausnutzen, um beliebigen Code auszuführen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

  • WID-SEC-W-2024-3195Oracle Communications: Mehrere SchwachstellenDeutsch2024-10-15csaf · 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-2024-3377Dell PowerProtect Data Domain: Mehrere SchwachstellenDeutsch2024-11-07csaf · cert_bundDE

    Ein lokaler Angreifer kann mehrere Schwachstellen in Dell PowerProtect Data Domain ausnutzen, um seine Privilegien zu erhöhen, Informationen offenzulegen und um nicht näher beschriebene Auswirkungen zu erzielen.

  • GHSA-hrfv-mqp8-q5rwWerkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning2023-10-25ghsa · osvUS

    Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.

  • PYSEC-2023-2212023-10-25vendor · osvUS

    Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1.

06

also known as (7)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvcert_bundncsc_nlNVDCVE.orgMITRE
published 2023-10-25modified 2026-10-08
09

references (14)

External citations — patches, advisories, analysis.

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