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CVE-2026-32313— xmlseclibs is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption

Quick assessment

Affected
robrichards xmlseclibs
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.

Xmlseclibs是robrichards个人开发者的一个用 PHP 编写的库，用于处理 XML 加密和签名。 Xmlseclibs 3.1.5之前版本存在安全漏洞，该漏洞源于使用aes-128-gcm、aes-192-gcm或aes-256-gcm加密的XML节点缺少身份验证标签长度验证，可能导致攻击者暴力破解身份验证标签、恢复GHASH密钥并解密加密节点，或伪造任意密文。

CVSS 8.2 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-32313

Vulnerability Information
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Vulnerability Title
xmlseclibs is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption
Source: CVE Program / CVE List V5
Vulnerability Description
xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Prior to 3.1.5, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker can use this to brute-force an authentication tag, recover the GHASH key, and decrypt the encrypted nodes. It also allows to forge arbitrary ciphertexts without knowing the encryption key. This vulnerability is fixed in 3.1.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Xmlseclibs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xmlseclibs是robrichards个人开发者的一个用 PHP 编写的库，用于处理 XML 加密和签名。 Xmlseclibs 3.1.5之前版本存在安全漏洞，该漏洞源于使用aes-128-gcm、aes-192-gcm或aes-256-gcm加密的XML节点缺少身份验证标签长度验证，可能导致攻击者暴力破解身份验证标签、恢复GHASH密钥并解密加密节点，或伪造任意密文。
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
robrichards xmlseclibs < 3.1.5 -

II. Public POCs for CVE-2026-32313

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9325 chars
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III. Intelligence Information for CVE-2026-32313

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Patches & Fixes for CVE-2026-32313 (2)

IV. Related Vulnerabilities

Same product: xmlseclibs
Same vendor: robrichards
Same weakness: CWE-354

V. Comments for CVE-2026-32313

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