CVE-2026-78135
HIGHCVSS 7.3/10EPSS 0.34%
Last modified
CVE-2026-78135 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.
Description
libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Strongswan | Strongswan | >= 5.9.7, <= 6.0.7 |
References
- https://github.com/strongswan/strongswan/releases/tag/6.1.0Release Notes, Vendor Advisory
- https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).htmlVendor Advisory, Mitigation
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-78135?
libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.
How severe is CVE-2026-78135?
CVE-2026-78135 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.
How do I fix CVE-2026-78135?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-7813Authorization vulnerability in pgAdmin 4 server mode affecti…9.9
- CVE-2026-78130strongSwan 4.2.0 through 6.0.7 has a NULL pointer dereferenc…7.5
- CVE-2026-78131strongSwan 4.2.0 through 6.0.7 has a missing release of memo…3.7
- CVE-2026-78132strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x…7.5
- CVE-2026-78133libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-…7.5
- CVE-2026-78134strongSwan 4.5.0 through 6.0.7 has Incorrect Access Control …7.1
- CVE-2026-78136chirpmyradio CHIRP before 39178db allows eval injection via …7.8
- CVE-2026-78137The StoreGrowth WordPress plugin before 2.1.2 does not vali…7.5
- CVE-2026-78138The Finale Lite WordPress plugin before 2.21.0 does not per…4.3
- CVE-2026-78139The Notifima WordPress plugin before 3.1.4 does not verify …4.3
- CVE-2026-7814Stored cross-site scripting (XSS) vulnerability in pgAdmin 4…4.8
- CVE-2026-78140A flaw has been found in Dromara UJCMS up to 10.1.3. The imp…4.7
Are you affected by CVE-2026-78135?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST