SB2026042834 - Ubuntu update for pyasn1
Published: April 28, 2026
Security Bulletin ID
SB2026042834
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) Uncontrolled Recursion (CVE-ID: CVE-2026-30922)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the pyasn1 BER decoder when decoding deeply nested ASN.1 data with indefinite-length constructed types. A remote attacker can supply a specially crafted payload containing nested SEQUENCE or SET tags to cause a denial of service.
Services that parse untrusted ASN.1 data may terminate with a RecursionError or exhaust available memory.
Remediation
Install update from vendor's website.