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Vulnerability record · CVE-2026-76245 · published 19 August 2026

CVE-2026-76245: Insufficient verification of data authenticity vulnerability

stigmem (pip package stigmem-node) version 0.9.0a1 contains a timestamp-handling mismatch in federation peer-token validation that can cause valid peer tokens to be incorrectly treated as expired. This affects the availability and reliability of authenticated federation flows on nodes using federation peer authentication paths. The issue is fixed in 0.9.0a2, which uses the canonical millisecond-based validation path.

7.1 CVSS 4.0 High EPSS 0.24% · top 86.6% CWE-345 · Insufficient verification of data authenticity Deferred
7.1CVSS 4.0 base score
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
11 Sep 2026Last modified by NVD

Description

stigmem (pip package stigmem-node) version 0.9.0a1 contains a timestamp-handling mismatch in federation peer-token validation that can cause valid peer tokens to be incorrectly treated as expired. This affects the availability and reliability of authenticated federation flows on nodes using federation peer authentication paths. The issue is fixed in 0.9.0a2, which uses the canonical millisecond-based validation path.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-xh5j-xjfq-qvvx
https://www.vulncheck.com/advisories/stigmem-federation-peer-token-timestamp-validation-bypass

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Source: NIST National Vulnerability Database (record CVE-2026-76245), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.