DEBIAN-CVE-2026-39373

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-39373
Published: 07 Apr 2026, 20:16
Last modified:11 Jul 2026, 21:00

Vulnerability Summary

Overall Risk (default)
low
21/100
CVSS Score
5.3 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

07 Apr 2026, 20:16
Published
Vulnerability first disclosed
11 Jul 2026, 21:00
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Systems

  • debian•python-jwcrypto

    all | all | all | all | < 1.5.6-1.1~deb13u1 | < 1.5.6-1.1

References (1)