Allocation of Resources Without Limits or Throttling in jwcrypto - CVE-2026-80179
Published: August 27, 2026
Vulnerability identifier: #VU145891
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80179
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in JWE.deserialize() compact JWE parsing fallback when parsing attacker-controlled malformed non-JSON token text with many period delimiters. A remote attacker can send a specially crafted JWE string to cause a denial of service.
Exploitation requires the application to pass untrusted JWE input to the deserializer before authentication succeeds.
Affected software
jwcrypto
How to mitigate CVE-2026-80179
Install security update from vendor's website.
jwcrypto - update to 1.5.9