SB2026042836 - Ubuntu update for pyasn1

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Main Vulnerability Database SB2026042836

SB2026042836 - Ubuntu update for pyasn1

Published: April 28, 2026

Security Bulletin ID SB2026042836
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Resource exhaustion (CVE-ID: CVE-2026-23490)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling RELATIVE-OID with excessive continuation octets. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.


2) 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.

References