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High severity7.5NVD Advisory· Published Jul 14, 2026· Updated Jul 21, 2026

CVE-2026-59885

CVE-2026-59885

Description

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pyasn1PyPI
< 0.6.40.6.4

Affected products

73

Patches

Vulnerability mechanics

References

5

News mentions

0

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