PatchTheCVECVE-2026-18089: Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass by verifying responses against the r
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Routine
HIGH 7.5REMOTEUPGRADE
CVE-2026-18089 is a high-severity flaw (CVSS 7.5) affecting net\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass by verifying responses against the response-embedded certificate in verify_xml when no trust anchor is configured. verify_xml in Net::SAML2::Role::VerifyXML runs "return if !$anchors && !$cacert;" as soon as the XML::Sig check succeeds, and that check uses the X.509 certificate taken from the response's own dsig:KeyInfo/dsig:X509Certificate element, so an unanchored respon
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
timlegge net\ UPGRADE
Affected: < 0.86
Fixed in: 0.86
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy net || rpm -q net || net --version
2. UPGRADE to 0.86 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade net
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade net
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-18108 CRITICAL 9.8 UPGRADE Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encrypted_assertion accep
- CVE-2026-18092 HIGH 8.1 UPGRADE Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass via XML signature wrapping because n