CVE-2026-44167 phpseclib: CVE-2024-27355 mitigation bypass — OID amplification DoS in ASN1::decodeOID()

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...

Deserialization of Untrusted Data

Overview phpseclib/phpseclib is a PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc. Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the decodeOID function. An attacker can cause excessive resource consumption ...