CVE-2026-1525

criticalpriority · track · 39EPSS 0.005 · 43 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.51% (43rd) EPSS
CVSS 9.8 · critical
Is it mine?
13 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted: * Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays * Applications that accept user-controlled header names without case-normalization Potential consequences: * Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request) * HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking

01

remediations

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

A vendor fix is available.

  • Fixednodejs-1:22.22.2-1.el10_1.x86_64 as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-devel-1:22.22.2-1.el10_1.x86_64 as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-docs-1:22.22.2-1.el10_1.noarch as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-full-i18n-1:22.22.2-1.el10_1.x86_64 as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-libs-1:22.22.2-1.el10_1.x86_64 as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-npm-1:10.9.7-1.22.22.2.1.el10_1.x86_64 as component of SUSE Liberty Linux 10suse_csaf

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

  • Fixednodejs-1:22.22.2-1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-devel-1:22.22.2-1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-docs-1:22.22.2-1.module+el8.10.0+24148+847b6786.noarch::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-full-i18n-1:22.22.2-1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-libs-1:22.22.2-1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-nodemon-0:3.0.1-1.module+el8.10.0+24148+847b6786.noarch::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-packaging-0:2021.06-6.module+el8.10.0+24148+847b6786.noarch::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednodejs-packaging-bundler-0:2021.06-6.module+el8.10.0+24148+847b6786.noarch::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixednpm-1:10.9.7-1.22.22.2.1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_csaf

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

  • Fixedv8-12.4-devel-3:12.4.254.21-1.22.22.2.1.module+el8.10.0+24148+847b6786.x86_64::nodejs:22 as component of SUSE Liberty Linux 8suse_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.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.5–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Lsecondary · ENISA EU
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Lsecondaryexploitability 3.9 · impact 2.5
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Lsecondary · OSV
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · SUSE Product Security
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-444USCWE-444US
05

affected products (13)

Products and version ranges known to be affected.

06

advisories (4)

Vendor and ecosystem advisories describing this.

  • RHSA-2026:7080security update for nodejs222026-04-08csaf · suse_csafDE

    security update for nodejs22

  • RHSA-2026:7123security update for nodejs2026-04-08csaf · suse_csafDE

    security update for nodejs

  • WID-SEC-W-2026-0933IBM App Connect Enterprise (Hono und Undici): Mehrere SchwachstellenDeutsch2026-03-30csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen oder andere nicht näher bezeichnete Angriffe durchzuführen.

  • GHSA-2mjp-6q6p-2qxmUndici has an HTTP Request/Response Smuggling issue2026-03-13ghsa · osvUS

    ### Impact Undici allows duplicate HTTP `Content-Length` headers when they are provided in an array with case-variant names (e.g., `Content-Length` and `content-length`). This produces malformed HTTP/1.1 requests with multiple conflicting `Content-Length` values on the wire. **Who is impacted:** - Applications using `undici.request()`, `undici.Client`, or similar low-level APIs with headers passed as flat arrays - Applications that accept user-controlled header names without case-normalization **Potential consequences:** - **Denial of Service**: Strict HTTP parsers (proxies, servers) will reject requests with duplicate `Content-Length` headers (400 Bad Request) - **HTTP Request Smuggling**: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking ### Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later. ### Workarounds If upgrading is not immediately possible: 1. **Validate header names**: Ensure no duplicate `Content-Length` headers (case-insensitive) are present before passing headers to undici 2. **Use object format**: Pass headers as a plain object (`{ 'content-length': '123' }`) rather than an array, which naturally deduplicates by key 3. **Sanitize user input**: If headers originate from user input, normalize header names to lowercase and reject duplicates

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundnvdosvsuse_csafNVDCVE.orgMITRE
published 2026-03-12modified 2026-06-17
09

references (17)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan