What is CVE-2026-18108?

CVE-2026-18108 is a critical-severity vulnerability in Timlegge Net::saml2, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-08-03.

How severe is CVE-2026-18108?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Timlegge Net::saml2

CVE-2026-18108

Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encrypted_assertion accepts an EncryptedAssertion whose decrypted content carries no signature. _verify_encrypted_assertion decrypts the EncryptedAsserti…

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Timlegge Net::saml2 — versions 0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (patch)
9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes)
9b29abf9-4ab0-4765-b253-1875cd9b441e

Frequently asked questions

What is CVE-2026-18108?: CVE-2026-18108 is a critical-severity vulnerability in Timlegge Net::saml2, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-08-03.
How severe is CVE-2026-18108?: Critical severity. CVSS v3 base score is 9.8 out of 10.