CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2026-39373
Medium (5.3) in latchset jwcrypto. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in jwcrypto 1.5.7.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-31)
- CWE
- CWE-409
- Published
- Modified
- Record from
- the NVD, synced
Affected
- latchset:jwcrypto
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fjrm-76x2-c4q4 | PyPI | jwcrypto | <1.5.7 | 1.5.7 |
| PYSEC-2026-70 | PyPI | jwcrypto | <1.5.7 | 1.5.7 |