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Vulnerabilities / CVE-2026-28802

critical

CVE-2026-28802

authlib: Authlib: Signature verification bypass via malicious JWT allows unauthorized access

Published Modified CWE 347
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA7.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Red Hat9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (high), Red Hat (high).

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.

Affected packages and fixed versions

SourcePackageFixed in
chainguardairflow-33.1.8-r0
debian 13python-authlibno fix listed
debian 14python-authlib1.6.7-1
echo pip::Echo OSVauthlib1.6.6+echo.1, 1.6.7
minimosairflow-2, airflow-32.11.2-r0 and 1 more
pip::GitHub Security Advisory pipauthlib1.6.7
rapidfort debian 12python-authlib0:1.6.7-1
rapidfort debian 13python-authlib0:1.6.7-1
Red Hatsatellite/foreman-mcp-server-rhel9no fix listed
wolfiairflow-33.1.8-r0
Show all 11 entries from 10 sources
SourcePackageFixed in
chainguardairflow-33.1.8-r0
debian 13python-authlibno fix listed
debian 14python-authlib1.6.7-1
echo pip::Echo OSVauthlib1.6.6+echo.1, 1.6.7
minimosairflow-22.11.2-r0
minimosairflow-33.1.8-r0
pip::GitHub Security Advisory pipauthlib1.6.7
rapidfort debian 12python-authlib0:1.6.7-1
rapidfort debian 13python-authlib0:1.6.7-1
Red Hatsatellite/foreman-mcp-server-rhel9no fix listed
wolfiairflow-33.1.8-r0

References

All 16 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.