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undici CVE-2026-84961

| EUVDEUVD-2026-71494 HIGH
Improper Certificate Validation (CWE-295)
2026-09-04 openjs
Information Disclosure Red Hat Undici Suse
7.4
CVSS 3.1 · Vendor: openjs
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Severity by source

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

MITM position required raises AC:H; no privileges or interaction needed; both confidentiality and integrity fully compromised via TLS intercept; no availability impact.

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

Primary rating from Vendor (openjs).

CVSS VectorVendor: openjs

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

Lifecycle Timeline

4
POC Analysis Generated
Sep 07, 2026 - 15:34 vuln.today
Patch available
Sep 04, 2026 - 18:03 EUVD
Analysis Generated
Sep 04, 2026 - 17:37 vuln.today
CVE Published
Sep 04, 2026 - 16:47 cve.org
HIGH 7.4

DescriptionCVE.org

undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-supplied checkServerIdentity callback or a custom connector inside the connect option, is silently discarded before it reaches the TLS layer. As a result a peer whose certificate the application's custom checkServerIdentity was written to reject, but which still passes Node's default hostname and chain checks, is accepted when reached through BalancedPool. The Client, Pool, and Agent dispatchers are not affected because they extract the connect and tls options before cloning. This affects undici versions from 7.24.1 up to 7.29.1 and from 8.0.0 up to 8.10.2, and only when the application supplies a function-valued connect or tls option to BalancedPool. Users should upgrade to undici 7.29.1 or 8.10.2.

AnalysisAI

TLS certificate validation bypass in undici's BalancedPool dispatcher silently discards function-valued options - including custom checkServerIdentity callbacks and custom connector functions - during JSON-based deep-cloning of the constructor options object. Affected versions span 7.24.1 through 7.29.0 and 8.0.0 through 8.10.1. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Three conditions must all be true simultaneously: (1) the application uses undici's BalancedPool dispatcher - not Client, Pool, or Agent; (2) the BalancedPool constructor is called with a function-valued `connect` or `tls` option, specifically a `checkServerIdentity` callback or a custom connector function; (3) the attacker must hold a network MITM position and possess a certificate that satisfies Node.js's default hostname and chain validation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS of 7.4 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N) is well-calibrated. … 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 7.29.1 (for 7.x deployments) or 8.10.2 (for 8.x deployments) as confirmed by the OpenJS Foundation advisory at https://github.com/nodejs/undici/security/advisories/GHSA-w293-vg96-wgc3. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and audit all Node.js applications running undici versions 7.24.1-7.29.0 or 8.0.0-8.10.1, prioritizing those handling sensitive data (credentials, payment information, customer PII). …

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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-2026-84961 vulnerability details – vuln.today
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