[Pkg-freeipa-devel] Bug#1133006: python-jwcrypto: CVE-2026-39373

[Salvatore Bonaccorso]

Source: python-jwcrypto
Version: 1.5.6-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for python-jwcrypto.

CVE-2026-39373[0]:
| JWCrypto implements JWK, JWS, and JWE specifications using python-
| cryptography. Prior to 1.5.7, an unauthenticated attacker can
| exhaust server memory by sending crafted JWE tokens with ZIP
| compression. The existing patch for CVE-2024-28102  limits input
| token size to 250KB but does not validate the decompressed output
| size. An unauthenticated attacker can cause memory exhaustion on
| memory-constrained systems. A token under the 250KB input limit can
| decompress to approximately 100MB. This vulnerability is fixed in
| 1.5.7.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-39373
    https://www.cve.org/CVERecord?id=CVE-2026-39373
[1] https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4
[2] https://github.com/latchset/jwcrypto/commit/25db861d8b29434838669a94a843af03d29ea6ed

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore