Resource exhaustion in Phpseclib

CVE-2026-44167

phpseclib is a PHP secure communications library. Prior to 1.0.29, 2.0.54, and 3.0.52, anyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc). This is a bypass of CVE-2024-27355. This vulnerability is fixed in 1.0.29, 2.0.54, and 3.0.52.

Vulnerability class: DoS (Denial of Service)

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.003 (24.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-44167: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

  • Phpseclib — versions >= 3.0.0, < 3.0.52, >= 2.0.0, < 2.0.54, >= 0.1.1, < 1.0.29

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44167?
CVE-2026-44167 is a high-severity vulnerability in Phpseclib, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-05-12.
How severe is CVE-2026-44167?
High severity. CVSS v3 base score is 7.5 out of 10.