CVE-2026-59884

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.

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Produits concernés

• pyasn1
• Pyasn1 pyasn1

Scores CVSS

Faiblesses (CWE)

• CWE-400

Références

• https://github.com/pyasn1/pyasn1/commit/628e36ecbb5277a3f01572ce418ef54271b165a5 Patch
• https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4 Release Notes
• https://github.com/pyasn1/pyasn1/security/advisories/GHSA-m4p7-r5rc-7g4j Third Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories