CVE-2026-18092: Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass via XML signature wrapping because n

Q: How do I fix CVE-2026-18092?

net\: upgrade to 0.86. Exact commands for each OS are on this page.

Q: Is CVE-2026-18092 being exploited?

CVE-2026-18092 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-18092 affect?

CVE-2026-18092 affects net\. Severity is high (CVSS 8.1). Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass via XML signature wrapping because new_from_xml reads assertion identity with document-wide XPath instead of the signed subtree. new_from_xml reads the NameID, attri

Routine

HIGH 8.1UPGRADE

CVE-2026-18092 is a high-severity flaw (CVSS 8.1) 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 via XML signature wrapping because new_from_xml reads assertion identity with document-wide XPath instead of the signed subtree. new_from_xml reads the NameID, attribute values, SessionIndex, audience and other identity fields with document-wide XPath, such as //saml:Assertion/saml:AttributeStatement/saml:Attribute and //saml:Subject/saml:NameID, which select the first mat

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-08-03
Last modified	2026-10-23

Publisher (CNA): CPANSec · Vendor: timlegge

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-03 14:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated 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.

Exact fixes by distribution

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

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.

Quick answers

How do I fix CVE-2026-18092?

net\: upgrade to 0.86. Exact commands for each OS are on this page.

Is CVE-2026-18092 being exploited?

CVE-2026-18092 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-18092 affect?

CVE-2026-18092 affects net\. Severity is high (CVSS 8.1). Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass via XML signature wrapping because new_from_xml reads assertion identity with document-wide XPath instead of the signed subtree. new_from_xml reads the NameID, attri

How urgent is CVE-2026-18092?

Priority 35/100. High severity

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-2026-18089 HIGH 7.5 UPGRADE Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass by verifying responses against the r

References

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