CVE-2026-23490 HIGH

CVE-2026-23490: pyasn1 has a DoS vulnerability in decoder

Vendor Pyasn1
Product pyasn1
Weakness CWE-770 · Uncontrolled resource consumption
Published January 16, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.

Key dates

02Disclosure timeline

January 16, 2026 CVE published
June 30, 2026 Record updated