What is CVE-2026-59885?

CVE-2026-59885 is a high-severity vulnerability in Pyasn1, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-14.

How severe is CVE-2026-59885?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Pyasn1

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 w…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Pyasn1 — versions < 0.6.4

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption
CWE-407 — Inefficient Algorithmic Complexity

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-59885?: CVE-2026-59885 is a high-severity vulnerability in Pyasn1, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-14.
How severe is CVE-2026-59885?: High severity. CVSS v3 base score is 7.5 out of 10.