SB2026040864 - Denial of service in jwcrypto
Published: April 8, 2026
Security Bulletin ID
SB2026040864
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper handling of highly compressed data (CVE-ID: CVE-2026-39373)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of highly compressed data in the deserialize function when processing crafted JWE tokens with ZIP compression. A remote attacker can send a specially crafted JWE token to cause a denial of service.
Memory-constrained systems are more likely to be affected.
Remediation
Install update from vendor's website.