Algorithm Confusion Vulnerability in SignXML by XML Security
CVE-2025-48994

6.9MEDIUM

Key Information:

Vendor

Xml-security

Status
Signxml
Vendor
CVE Published:
2 June 2025

What is CVE-2025-48994?

SignXML, a Python implementation of the W3C XML Signature standard, is susceptible to an algorithm confusion attack when verifying signatures without X509 certificate validation and with an HMAC shared secret set. In versions prior to 4.0.4, if the user does not explicitly limit expected signature algorithms, an attacker may exploit this vulnerability by supplying a signature signed with an unexpected asymmetric key instead of the provided HMAC key. From version 4.0.4 onwards, specifying the HMAC key restricts the accepted signature algorithms to HMAC only, mitigating this risk.

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Affected Version(s)

signxml < 4.0.4

References

https://github.com/XML-Security/signxml/security/advisori...
x_refsource_CONFIRM
https://github.com/XML-Security/signxml/commit/e3c0c2b82a...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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