CVE-2026-78135

Summary

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.

Affected Software

Weaknesses

• CWE-841: CWE-841 Improper Enforcement of Behavioral Workflow

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/strongswan/strongswan/releases/tag/6.1.0
• https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

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