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

Quick assessment

Affected
phpseclib phpseclib
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

phpseclib是phpseclib开源的一个 PHP 安全通信库。 phpseclib 1.0.29之前版本、2.0.54之前版本和3.0.52之前版本存在资源管理错误漏洞，该漏洞源于加载不受信任的ASN1文件时存在绕过CVE-2024-27355的问题。

CVSS 7.5 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
phpseclib phpseclib >= 3.0.0, < 3.0.52 affected
>= 2.0.0, < 2.0.54 affected
>= 0.1.1, < 1.0.29 affected
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I. Basic Information for CVE-2026-44167

Vulnerability Information
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Vulnerability Title
phpseclib: CVE-2024-27355 mitigation bypass — OID amplification DoS in ASN1::decodeOID()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
phpseclib 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phpseclib是phpseclib开源的一个 PHP 安全通信库。 phpseclib 1.0.29之前版本、2.0.54之前版本和3.0.52之前版本存在资源管理错误漏洞，该漏洞源于加载不受信任的ASN1文件时存在绕过CVE-2024-27355的问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phpseclib phpseclib >= 3.0.0, < 3.0.52 -

II. Public POCs for CVE-2026-44167

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10633 chars
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III. Intelligence Information for CVE-2026-44167

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Patches & Fixes for CVE-2026-44167 (1)

Vendor Advisories for CVE-2026-44167 (1)

IV. Related Vulnerabilities

Same product: phpseclib
Same vendor: phpseclib
Same weakness: CWE-400

V. Comments for CVE-2026-44167

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