Use of Uninitialized Variable in strongSwan - CVE-2026-78123
Published: September 22, 2026
Vulnerability identifier: #VU151582
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78123
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use of uninitialized stack variables in the openssl plugin when processing PKCS#7 signerInfo or recipientInfo structures encoded with subjectKeyIdentifier. A remote attacker can send a crafted IKEv1 message containing such a structure to cause a denial of service.
Affected software
strongSwan
Debian Linux
strongswan (Debian package)
Debian Linux
strongswan (Debian package)
How to mitigate CVE-2026-78123
Install security update from vendor's website.
strongSwan - update to 6.1.0
strongswan (Debian package) - update to 6.0.1-6+deb13u7
strongswan (Debian package) - update to 6.0.1-6+deb13u7