What is CVE-2026-78127?

CVE-2026-78127 is a low-severity vulnerability in Strongswan, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 3.7/10. Published 2026-09-11.

How severe is CVE-2026-78127?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Strongswan

CVE-2026-78127

libcharon in strongSwan 4.1.2 through 6.0.7 has a missing release of memory after its effective lifetime in the IKE message parser.

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

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (35.0th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% 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: 0.004 · change: +0.001

Affected products

Strongswan

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

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-2026-78127).ht… (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78127?: CVE-2026-78127 is a low-severity vulnerability in Strongswan, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 3.7/10. Published 2026-09-11.
How severe is CVE-2026-78127?: Low severity. CVSS v3 base score is 3.7 out of 10.