What is CVE-2026-59884?

CVE-2026-59884 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-2026-59884?

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

Resource exhaustion in Pyasn1

CVE-2026-59884

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to…

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

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-2026-59884?: CVE-2026-59884 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-2026-59884?: High severity. CVSS v3 base score is 7.5 out of 10.