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Vulnerability record · CVE-2026-59885 · published 14 July 2026

CVE-2026-59885: Pyasn1 uncontrolled resource consumption vulnerability

PPyasn1 · Pyasn1

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.

7.5 CVSS 3.1 High EPSS 0.62% · top 52.6% CWE-400 · Uncontrolled resource consumptionCWE-407 · CWE-407
7.5CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
21 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pyasn1/pyasn1/commit/45bdb19eb7df4b3780fe9c912c63e99bffc39dd9 Patch
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4 Release Notes
https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-59885), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.