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Vulnerability record · CVE-2026-78133 · published 11 September 2026

CVE-2026-78133: Strongswan use after free vulnerability

Strongswan · Strongswan

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

7.5 CVSS 3.1 High EPSS 0.43% · top 65.7% CWE-416 · Use after free
7.5CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
14 Sep 2026Last modified by NVD

Description

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/strongswan/strongswan/releases/tag/6.1.0 PatchRelease NotesVendor Advisory
https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78133).html MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-0590Frees wan vulnerabilityFreeS/WAN 1.x and 2.x, and other related products including superfreeswan 1.x, openswan 1.x before 1.0.6, openswan 2.x before 2.1.4, and strongSwan b…EPSS 2.8%9.8CVE-2023-41913Strongswan classic buffer overflow vulnerabilitystrongSwan before 5.9.12 has a buffer overflow and possible unauthenticated remote code execution via a DH public value that exceeds the internal buf…EPSS 2.3%9.8CVE-2023-26463Strongswan improper certificate validation vulnerabilitystrongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named "public" for two different purposes within the s…EPSS 2.3%9.8CVE-2015-3991Strongswan vulnerabilitystrongSwan 5.2.2 and 5.3.0 allows remote attackers to cause a denial of service (daemon crash) or execute arbitrary code.EPSS 4.6%9.1CVE-2021-45079Strongswan null pointer dereference vulnerabilityIn strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the ca…EPSS 2.8%7.5CVE-2026-78130Strongswan null pointer dereference vulnerabilitystrongSwan 4.2.0 through 6.0.7 has a NULL pointer dereference in the x509 plugin's attribute certificate parser.EPSS 0.32%7.5CVE-2026-78132Strongswan vulnerabilitystrongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for ietfAttrSyntax.EPSS 0.32%7.5CVE-2022-40617Strongswan uncontrolled resource consumption vulnerabilitystrongSwan before 5.9.8 allows remote attackers to cause a denial of service in the revocation plugin by sending a crafted end-entity (and intermedia…EPSS 1.7%

Source: NIST National Vulnerability Database (record CVE-2026-78133), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.