CVE-2026-78135

HIGHNVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
Patch available. Sources: github_release.
generic

strongSwan - strongSwan Vulnerability (CVE-2026-78135)

https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html
github_release Patch Available

strongSwan 6.1.0

Patch available: strongswan/strongswan 6.1.0

https://github.com/strongswan/strongswan/releases/tag/6.1.0

Vendor Advisories for CVE-2026-78135(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 37× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 07:16 UTCEG score recompute
  2. 2026-09-19 07:16 UTCVendor advisory
  3. 2026-09-19 07:16 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 19:25 UTCVendor advisory
  6. 2026-09-18 19:25 UTCGHSA enrichment
  7. 2026-09-18 07:35 UTCVendor advisory
  8. 2026-09-18 07:35 UTCGHSA enrichment
  9. 2026-09-17 19:44 UTCEG score recompute
  10. 2026-09-17 19:44 UTCVendor advisory
  11. 2026-09-17 19:44 UTCGHSA enrichment
  12. 2026-09-17 07:50 UTCVendor advisory
  13. 2026-09-17 07:50 UTCGHSA enrichment
  14. 2026-09-16 19:59 UTCEG score recompute▲ 1.70
  15. 2026-09-16 19:59 UTCVendor advisory
  16. 2026-09-16 19:59 UTCGHSA enrichment
  17. 2026-09-16 19:44 UTCNVD updateCVSS v3 → 7.3 · severity → HIGH
  18. 2026-09-16 18:36 UTCEG score recompute
  19. 2026-09-16 18:36 UTCVendor advisory
  20. 2026-09-16 18:36 UTCGHSA enrichment
  21. 2026-09-16 14:08 UTCEPSS rescore
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 16:34 UTCEG score recompute
  24. 2026-09-15 16:34 UTCVendor advisory
  25. 2026-09-15 16:34 UTCGHSA enrichment
Show 19 more
  1. 2026-09-15 15:43 UTCEG score recompute
  2. 2026-09-15 15:43 UTCVendor advisory
  3. 2026-09-15 15:43 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 21:13 UTCVendor advisory
  7. 2026-09-14 21:13 UTCGHSA enrichment
  8. 2026-09-13 19:11 UTCEG score recompute
  9. 2026-09-13 19:11 UTCVendor advisory
  10. 2026-09-13 19:11 UTCGHSA enrichment
  11. 2026-09-12 17:09 UTCEG score recompute
  12. 2026-09-12 17:09 UTCGHSA enrichment
  13. 2026-09-11 15:07 UTCEG score recompute
  14. 2026-09-11 15:07 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 03:20 UTCEG score recompute
  18. 2026-09-11 02:35 UTCEG score recompute
  19. 2026-09-11 02:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78135?
CVE-2026-78135 is a high vulnerability published on September 11, 2026. libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATECHILDSA requests are mishandled, there can be an authentication bypass.
When was CVE-2026-78135 disclosed?
CVE-2026-78135 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78135 actively exploited?
CVE-2026-78135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-78135?
CVE-2026-78135 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-78135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78135, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-78135

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