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HIGH

CVE-2026-59885

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pyasn1PyPIall versions · fixed in 0.6.4

Vendor advisories

  • CVE-2026-59885 Red Hat Product Security102 products fixed · 97 known affected

    pyasn1: python-pyasn1: pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER

    exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8

  • RHSA-2026:83121 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.4.6 (rocm)

  • RHSA-2026:77532 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Release of components for Service Telemetry Framework 1.5.7

  • RHSA-2026:73987 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

  • RHSA-2026:70267 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.14.9

  • RHSA-2026:69255 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.16.6

14 more advisories

Full record on 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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-07-14
Last Modified
2026-07-15
GitHub Advisory
GHSA-8ppf-4f7h-5ppj

Frequently asked questions

What is CVE-2026-59885?

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.

Is CVE-2026-59885 actively exploited?

Active exploitation of CVE-2026-59885 has not been confirmed. Its EPSS score was 0.6% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-59885?

CVE-2026-59885 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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