CVE-2026-1526

highpriority · track · 0EPSS 0.012 · 67 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
1.17% (67th) EPSS
CVSS 7.5 · high
Is it mine?
13 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.

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.

7.5
010

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

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:Hsecondaryexploitability 3.9 · impact 3.6
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
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV
03

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-409USCWE-409USCWE-770US
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-vrm6-8vpv-qv8qUndici has Unbounded Memory Consumption in WebSocket permessage-deflate Decompression2026-03-13ghsa · osvUS

    ## Description The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the `PerMessageDeflate.decompress()` method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold. ## Impact - Remote denial of service against any Node.js application using undici's WebSocket client - A single compressed WebSocket frame of ~6 MB can decompress to ~1 GB or more - Memory exhaustion occurs in native/external memory, bypassing V8 heap limits - No application-level mitigation is possible as decompression occurs before message delivery ### Patches Users should upgrade to fixed versions. ### Workarounds No workaround are possible.

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 2026-09-04
09

references (33)

External citations — patches, advisories, analysis.

scry

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