CVE-2026-80179
Published:August 27, 2026
Updated:September 24, 2026
A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.
Affected Packages
jwcrypto (CONDA):
Affected version(s) >=0.5.0 <1.5.9Fix Suggestion:
Update to version 1.5.9https://github.com/latchset/jwcrypto.git (GITHUB):
Affected version(s) >=v0.2.0 <v1.5.9Fix Suggestion:
Update to version v1.5.9jwcrypto (PYTHON):
Affected version(s) >=0.2.0 <1.5.9Fix Suggestion:
Update to version 1.5.9Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.25