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High

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

  • Disclosed: 05.05.2026
  • Updated: 11.10.2026 10:22

Impact

Anyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc)

Patches

https://github.com/phpseclib/phpseclib/commit/d53d2021bcb9f6a04d5d44ec99e6bbef219a71bc

Workarounds

No.

References

https://github.com/phpseclib/phpseclib/commit/d53d2021bcb9f6a04d5d44ec99e6bbef219a71bc

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package phpseclib/phpseclib >= 0.1.1, < 1.0.29, >= 2.0.0, < 2.0.54, >= 3.0.0, < 3.0.52 1.0.29, 2.0.54, 3.0.52

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-400
Platform
Composer
Package
phpseclib/phpseclib
Disclosed
05.05.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-3qpq-r242-jqj7 - CC BY 4.0

Vulnerability history: phpseclib/phpseclib

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (11) in the archive
Total entries
11
First → latest
04.2021 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 8
  • Medium 2
  • Low 1

Disclosures per year

Severity:
  1. Phpseclib needs guardrails on large binaryfield integers
    High · 7.5 CVE-2023-49316 >= 3.0.0, < 3.0.34 3.0.34
  2. phpseclib guardrails needed on OID length
    High · 7.5 CVE-2024-27355 >= 2.0.0, < 2.0.47, >= 3.0.0, < 3.0.36, >= 0.1.1, < 1.0.23 2.0.47, 3.0.36, 1.0.23
  3. phpseclib: guardrails needed on isPrime and randomPrime
    High · 7.5 CVE-2024-27354 >= 0.1.1, < 1.0.23, >= 2.0.0, < 2.0.47, >= 3.0.0, < 3.0.36 1.0.23, 2.0.47, 3.0.36
  4. phpseclib has a CVE-2024-27355 mitigation bypass — OID amplification DoS in ASN1::decodeOID() this entry
    High · 7.5 CVE-2026-44167 >= 0.1.1, < 1.0.29, >= 2.0.0, < 2.0.54, >= 3.0.0, < 3.0.52 1.0.29, 2.0.54, 3.0.52
  5. phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
    High CVE-2026-32935 >= 3.0.0, < 3.0.50, >= 2.0.0, < 2.0.52, >= 0.1.1, < 1.0.27 3.0.50, 2.0.52, 1.0.27
  6. Name confusion in x509 Subject Alternative Name fields
    High · 7.5 CVE-2023-52892 < 1.0.22, >= 2.0.0, < 2.0.46, >= 3.0.0, < 3.0.33 1.0.22, 2.0.46, 3.0.33
  7. phpseclib Infinite Loop vulnerability
    High · 7.5 CVE-2023-27560 >= 3.0.0, < 3.0.19 3.0.19
  8. Improper Certificate Validation in phpseclib
    High · 7.5 CVE-2021-30130 >= 3.0.0, < 3.0.7, < 2.0.31 3.0.7, 2.0.31

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