CVE-2026-85152

Aliases:RHSA-2026:54438DEBIAN-CVE-2026-85152UBUNTU-CVE-2026-85152
Advisory lineage Upstream: 5 Downstream: 2
Analyzed
Published: 04 Sept 2026, 16:36
Last modified:04 Sept 2026, 19:29

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.4 HIGH
v3.1 (cve.org)
EPSS Score
0.16% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 Sept 2026, 16:36
Published
Vulnerability first disclosed
04 Sept 2026, 19:29
Last Modified
Vulnerability information updated

Description

undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.

CVSS Metrics

  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.16%• Percentile: 6%

Techniques & Countermeasures

  • CWE-346•Origin Validation Error

    The product does not properly verify that the source of data or communication is valid.

Affected Systems

  • debian•node-undici

    all | all | all | < 8.10.2+dfsg+~cs3.2.2-1

  • ubuntu•node-undici

    all | all

  • nodejs•undici

    ≥ 8.10.0, < 8.10.2

  • redhat•nodejs24

    < 0:24.18.1-0.2.2.hum1

  • redhat•nodejs24-bin

    < 0:24.18.1-0.2.2.hum1

  • undici•undici

    ≥ 8.10.0, < 8.10.2

References (38)