What is CVE-2025-31335?

CVE-2025-31335 is a medium-severity vulnerability in Shibboleth Opensaml C++ Library, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.0/10. Published 2025-03-28.

How severe is CVE-2025-31335?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2025-31335 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Shibboleth Opensaml C++ Library

CVE-2025-31335

The OpenSAML C++ library before 3.3.1 allows forging of signed SAML messages via parameter manipulation (when using SAML bindings that rely on non-XML signatures).

EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Shibboleth Opensaml C++ Library — versions 0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

w4zu/Debian_

References

Frequently asked questions

What is CVE-2025-31335?: CVE-2025-31335 is a medium-severity vulnerability in Shibboleth Opensaml C++ Library, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.0/10. Published 2025-03-28.
How severe is CVE-2025-31335?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2025-31335 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.