phpseclib: CVE-2024-27355 mitigation bypass — OID amplification DoS in ASN1::decodeOID()

Description

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.

Scores

EPSS (exploitation in 30 days)

0.20% · top 90% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-400: Uncontrolled Resource Consumption (opens in a new tab)All about CWE-400 and its CVEs

Affected products

• phpseclib · phpseclib

  • affected >= 3.0.0, < 3.0.52
  • affected >= 2.0.0, < 2.0.54
  • affected >= 0.1.1, < 1.0.29

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Packagistphpseclib/phpseclibGHSA-3qpq-r242-jqj7 (opens in a new tab)

References (2)

• https://github.com/phpseclib/phpseclib/security/advisories/GHSA-3qpq-r242-jqj7 (opens in a new tab)x_refsource_CONFIRM
• https://github.com/phpseclib/phpseclib/commit/d53d2021bcb9f6a04d5d44ec99e6bbef219a71bc (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-3qpq-r242-jqj7 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-44167](https://trackcve.app/badge/CVE-2026-44167.svg)](https://trackcve.app/cve/CVE-2026-44167)

Record last updated 14 May 2026, 19:24 UTC.