CVE-2019-3465 Signature validation bypass in XmlSecLibs

What is CVE-2019-3465?

CVE-2019-3465 is a high-severity vulnerability in Debian Debian Linux, published on 7 Nov 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Rob Richards XmlSecLibs, all versions prior to v3.0.3, as used for example by SimpleSAMLphp, performed incorrect validation of cryptographic signatures in XML messages, allowing an authenticated attacker to impersonate others or elevate privileges by creating a crafted XML message.

Weakness: CWE-347

Which versions are affected by CVE-2019-3465?

4 open source packages ship an affected version, including robrichards/xmlseclibs. It affects 3 products.

Products include Debian Debian Linux, Simplesamlphp Simplesamlphp, Xmlseclibs Project Xmlseclibs.

How do I fix CVE-2019-3465?

Upgrade robrichards/xmlseclibs to a fixed version for your release line: 2.1.1 or 3.0.4.

Is CVE-2019-3465 being exploited?

There is no known exploitation of CVE-2019-3465 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-3465, DLA-1983-1, DSA-4560-1, GHSA-pqm6-cgwr-x6pf, UBUNTU-CVE-2019-3465.