Incorrect Implementation of Authentication Algorithm Affecting signxml package, versions [,4.0.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published5 Jun 2025
- disclosed2 Jun 2025
- creditahacker1-securesaml
Introduced: 2 Jun 2025
NewCVE-2025-48994 (opens in a new tab)How to fix?
Upgrade signxml to version 4.0.4 or higher.
Overview
signxml is a Python XML Signature and XAdES library
Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm due to the improper handling of signature verification settings when require_x509 is set to false and hmac_key is specified. An attacker can manipulate the signature verification process by supplying a signature with an unexpected algorithm, leading to potential security breaches.
Note:
This is only exploitable if the user has not explicitly limited the expected signature algorithms using the expect_config setting in signxml.XMLVerifier.verify function.