🛡️ OESA-2026-1923 — python-jwcrypto

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

python-jwcrypto security update

Implements JWK, JWS, JWE specifications with python-cryptography

Security Fix(es):

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.(CVE-2026-39373)

Affected software

OESA-2026-1923 is recorded against 1 package.

  • python-jwcrypto (fixed in 1.5.0-4.oe2403sp2)

Timeline and source

Published on 17 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openeuler.org (Advisory)
nvd.nist.gov (Advisory)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-04-17
Updated 2026-08-12
Modified 2026-04-17
Fix URL N/A

Affected Packages

Software From version Fixed in
python-jwcrypto — 1.5.0-4.oe2403sp2

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