CVE-2026-1526 (GCVE-0-2026-1526)

Vulnerability from cvelistv5 – Published: 2026-03-12 20:08 – Updated: 2026-06-30 02:43
VLAI
Title
undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-409 - Improper handling of highly compressed data (data amplification)
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://github.com/nodejs/undici/security/advisor…
https://hackerone.com/reports/3481206
https://cna.openjsf.org/security-advisories.html
https://datatracker.ietf.org/doc/html/rfc7692
https://access.redhat.com/security/cve/CVE-2026-1526 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447142 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:17789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7310 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7080 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7675 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7123 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7670 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7983 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7302 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7350 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:9742 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13826 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5807 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21772 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21931 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
undici undici Affected: < 6.24.0; 7.0.0 < 7.24.0
Unaffected: 6.24.0: 7.24.0
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Red Hat Cryostat 4 on RHEL 9     cpe:/a:redhat:cryostat:4::el9
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Developer Hub 1.8     cpe:/a:redhat:rhdh:1.8::el9
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Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat OpenShift AI 2.16     cpe:/a:redhat:openshift_ai:2.16::el8
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Red Hat Red Hat OpenShift Dev Spaces 3.28     cpe:/a:redhat:openshift_devspaces:3.28::el9
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Red Hat Red Hat OpenShift Pipelines 1.2     cpe:/a:redhat:openshift_pipelines:1.20::el9
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat Red Hat Developer Hub     cpe:/a:redhat:rhdh:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Credits
Matteo Collina Ulises Gascón HO9
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      "date": "2026-06-29",
      "epss": "0.00641",
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.