CVE-2026-39373
JWCrypto: JWE ZIP decompression bomb
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:LAvailabilityLow
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka red hat
latchset
oss-project
ООО «Ред Софт»
commercial·RUaka red soft
Exploitability
Official Patch Available
References
https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4
github.com
https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4
github.com
https://github.com/latchset/jwcrypto
github.com
and 3 more references View all →
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