What is CVE-2026-78126?

CVE-2026-78126 is a medium-severity vulnerability in Strongswan, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-09-11.

How severe is CVE-2026-78126?

Medium severity. CVSS v3 base score is 5.9 out of 10.

NULL pointer dereference in Strongswan

CVE-2026-78126

strongSwan 4.1.10 through 6.0.7 allows a NULL pointer dereference in the eap-aka plugin.

Published 2026-09-11 · last modified 2026-09-14.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.6th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Strongswan

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/strongswan/strongswan/releases/tag/6.1.0 (Patch, Release Notes, Vendor Advisory)
www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78126).ht… (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78126?: CVE-2026-78126 is a medium-severity vulnerability in Strongswan, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-09-11.
How severe is CVE-2026-78126?: Medium severity. CVSS v3 base score is 5.9 out of 10.