PT-2026-58287 · Pypi · Pyasn1

CVE-2026-59885 · Published 2026-07-14 · Updated 2026-07-14

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions pyasn1 versions prior to 0.6.4

Description The BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. A crafted payload containing an OID with many arcs can cause excessive CPU consumption during the decode() call, leading to a denial of service for applications processing untrusted ASN.1 data. Similarly, the encoders exhibit the same quadratic behavior when re-encoding previously decoded attacker-supplied values.

Recommendations Update pyasn1 to version 0.6.4.

Exploit

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-407

Related Identifiers

CVE-2026-59885

GHSA-8PPF-4F7H-5PPJ

Affected Products

Pyasn1

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59885.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-59885 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-59885 · Security Note
• https://github.com/pyasn1/pyasn1/commit/45bdb19eb7df4b3780fe9c912c63e99bffc39dd9 · Note
• https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj · Note
• https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4 · Note