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librenswan: IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

🗓️ 27 Jul 2026 03:23:42Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 10 Views

Libreswan IKEv2 RSA PKCS1 v1.5 auth fails DER check, causing DoS; weak exponent enables forgery.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64libreswan4.12-2.el8_10.6libreswan-4.12-2.el8_10.6.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lelibreswan4.12-2.el8_10.6libreswan-4.12-2.el8_10.6.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xlibreswan4.12-2.el8_10.6libreswan-4.12-2.el8_10.6.s390x.rpm
Red Hat Enterprise Linux8.10x86_64libreswan4.12-2.el8_10.6libreswan-4.12-2.el8_10.6.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64libreswan-debuginfo4.12-2.el8_10.6libreswan-debuginfo-4.12-2.el8_10.6.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lelibreswan-debuginfo4.12-2.el8_10.6libreswan-debuginfo-4.12-2.el8_10.6.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xlibreswan-debuginfo4.12-2.el8_10.6libreswan-debuginfo-4.12-2.el8_10.6.s390x.rpm
Red Hat Enterprise Linux8.10x86_64libreswan-debuginfo4.12-2.el8_10.6libreswan-debuginfo-4.12-2.el8_10.6.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64libreswan-debugsource4.12-2.el8_10.6libreswan-debugsource-4.12-2.el8_10.6.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lelibreswan-debugsource4.12-2.el8_10.6libreswan-debugsource-4.12-2.el8_10.6.ppc64le.rpm
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17 Aug 2026 07:57Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.9 - 8.1
EPSS0.00346
SSVC
10