CVEvulnerability

CVE-2026-59884

7.5 HIGH Published 2026-07-14 Modified 2026-07-21 Official page ↗
Status
Analyzed
Published
2026-07-14
Last modified
2026-07-21
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-400

Description

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is fixed in version 0.6.4.

Affected configurations

• pyasn1 pyasn1 (< 0.6.4)

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References