CVE-2026-32600
Authentication Tag Validation Bypass in xml-security Enables Decryption
Publication date: 2026-03-16
Last updated on: 2026-03-17
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| simplesamlphp | xml-security | to 1.13.9 (exc) |
| simplesamlphp | xml-security | From 2.0.0 (inc) to 2.3.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-354 | The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade the xml-security library to version 2.3.1 or later, or version 1.13.9 or later, where the issue with authentication tag length validation is fixed.
Can you explain this vulnerability to me?
This vulnerability exists in the xml-security library versions prior to 2.3.1 and 1.13.9. The issue is that XML nodes encrypted with aes-128-gcm, aes-192-gcm, or aes-256-gcm do not properly validate the length of the authentication tag. Because of this, an attacker can brute-force the authentication tag, recover the GHASH key, and decrypt the encrypted XML nodes. Additionally, the attacker can forge arbitrary ciphertexts without knowing the encryption key.
How can this vulnerability impact me? :
The vulnerability can lead to unauthorized decryption of encrypted XML data, exposing sensitive information. It also allows attackers to forge ciphertexts, potentially leading to data tampering or injection of malicious data. This compromises the confidentiality and integrity of the data protected by the xml-security library.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know