CVE-2024-34581: w3c XML Signature Syntax And Processing

High severity, CVSS 7.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The W3C XML Signature Syntax and Processing (XMLDsig) specification, starting with 1.0, was originally published with a "RetrievalMethod is a URI ... that may be used to obtain key and/or certificate information" statement and no accompanying information about SSRF risks, and this may have contributed to vulnerable implementations such as those discussed in CVE-2023-36661 and CVE-2024-21893. NOTE: this was mitigated in 1.1 and 2.0 via a directly referenced Best Practices document that calls on implementers to be wary of SSRF.

Affected products

• w3c XML Signature Syntax And Processing: before 1.1 (fixed in 1.1); before 2.0 (fixed in 2.0)

Published 2024-06-26. Last modified 2026-06-17.