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undici CVE-2026-85024

| EUVDEUVD-2026-71603 MEDIUM
Uncaught Exception (CWE-248)
2026-09-04 openjs
Denial Of Service Node.js Red Hat Undici Suse
5.9
CVSS 3.1 · Vendor: openjs
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Severity by source

Vendor (openjs) PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.9 MEDIUM

Network-exploitable, unauthenticated DoS requiring a specifically crafted compress-then-corrupt payload justifies AC:H; pure availability impact only.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.9 MEDIUM
qualitative

Primary rating from Vendor (openjs).

CVSS VectorVendor: openjs

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Sep 04, 2026 - 18:03 EUVD
Analysis Generated
Sep 04, 2026 - 17:06 vuln.today
CVE Published
Sep 04, 2026 - 16:20 cve.org
MEDIUM 5.9

DescriptionCVE.org

undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.

AnalysisAI

Process-crashing denial of service in undici's WebSocket permessage-deflate implementation allows a remote unauthenticated attacker to terminate any Node.js process hosting the affected client by sending a crafted compressed WebSocket frame. The size-limit enforcement routine strips all event listeners - including the error handler - from the zlib inflate stream while the stream is still active; a subsequent malformed DEFLATE byte then emits an uncaught error that Node.js treats as a fatal unhandled exception, killing the process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The target application must use undici's WebSocket client and the permessage-deflate extension must be negotiated between both peers during the WebSocket handshake (i.e., both sides must have advertised and accepted the extension). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H, score 5.9) accurately captures a remotely triggerable, unauthenticated availability impact with high attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade undici to version 6.28.1 (for the 6.x branch), 7.29.1 (for the 7.x branch), or 8.10.2 (for the 8.x branch) as appropriate, per the OpenJS advisory at https://github.com/nodejs/undici/security/advisories/GHSA-3wwx-pv8p-q78v. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected

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CVE-2026-85024 vulnerability details – vuln.today
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