CVE-2026-78135

HIGHNVD 7.37.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 0.4% (36th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 5.6 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-09-11) is not newer than that change (2026-09-16), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 5 sources updated this week

Also known asEUVD-2026-75921 (ENISA EUVD) · GHSA-937c-856w-w843 (GitHub Security Advisories)Source: ENISA EUVD

7.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.3HIGHmedium confidence
EG Risk
33
EG Risk 33/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity73% × 45%
Impact severity (EG Severity): CVSS 7.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.3): severity, escalated by confirmed exploitation. This CVE's 7.3 is its impact severity (EG Severity), not escalated.

EG Severity
7.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 11, 2026

Last Modified

September 16, 2026

Advisory Details (2)

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

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(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntustrongswan-swanctl (6.0.4-1ubuntu3.2) @ resolute2026-10-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
strongswan5.9.11-1 ... 6.1.0-2 (27 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
strongswan6.0.1-6 ... 6.0.1-6+deb13u6 (6 versions)
  • every version up to 6.0.1-6+deb13u7: fixed in 6.0.1-6+deb13u7
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
strongswan6.0.1-6 ... 6.0.7-1 (7 versions)
  • every version up to 6.1.0-1: fixed in 6.1.0-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 85× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 212 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 112 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-28 21:36 UTCEG score recompute
  6. 2026-10-28 21:36 UTCVendor advisory
  7. 2026-10-28 21:36 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  8. 2026-10-28 19:55 UTCOSV refresh
  9. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-25 14:00 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-20 22:01 UTCEG score recompute
  19. 2026-10-20 22:01 UTCVendor advisory
  20. 2026-10-20 22:01 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  21. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-18 03:11 UTCEG score recompute
  25. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 75 more
  1. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-10-13 06:51 UTCEG score recompute
  6. 2026-10-13 06:51 UTCVendor advisory
  7. 2026-10-13 06:51 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  8. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-12 15:37 UTCEG score recompute
  10. 2026-10-11 21:57 UTCVendor advisory
  11. 2026-10-11 21:57 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  12. 2026-10-11 19:23 UTCEG score recompute
  13. 2026-10-11 16:39 UTCEG score recompute
  14. 2026-10-11 13:57 UTCEG score recompute
  15. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-11 10:05 UTCVendor advisory
  17. 2026-10-11 10:04 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  18. 2026-10-10 20:08 UTCEG score recompute
  19. 2026-10-10 20:08 UTCVendor advisory
  20. 2026-10-10 20:08 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  21. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-10 08:04 UTCEG score recompute
  23. 2026-10-10 08:04 UTCVendor advisory
  24. 2026-10-10 08:04 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  26. 2026-10-09 19:40 UTCVendor advisory
  27. 2026-10-09 19:40 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  28. 2026-10-09 00:34 UTCEG score recompute
  29. 2026-10-09 00:34 UTCVendor advisory
  30. 2026-10-09 00:33 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  31. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  32. 2026-10-08 12:42 UTCVendor advisory
  33. 2026-10-08 12:41 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  34. 2026-10-07 23:56 UTCEG score recompute
  35. 2026-10-07 23:56 UTCVendor advisory
  36. 2026-10-07 23:56 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  37. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  38. 2026-10-07 12:05 UTCVendor advisory
  39. 2026-10-07 12:04 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  40. 2026-10-07 00:05 UTCEG score recompute
  41. 2026-10-07 00:05 UTCVendor advisory
  42. 2026-10-07 00:05 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  43. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  44. 2026-10-06 12:14 UTCVendor advisory
  45. 2026-10-06 12:14 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  46. 2026-10-06 00:23 UTCEG score recompute
  47. 2026-10-06 00:23 UTCVendor advisory
  48. 2026-10-06 00:23 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  49. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  50. 2026-10-05 12:29 UTCVendor advisory
  51. 2026-10-05 12:29 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  52. 2026-10-05 00:38 UTCEG score recompute
  53. 2026-10-05 00:38 UTCVendor advisory
  54. 2026-10-05 00:38 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  55. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  56. 2026-10-04 12:47 UTCVendor advisory
  57. 2026-10-04 12:47 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  58. 2026-10-04 00:56 UTCEG score recompute
  59. 2026-10-04 00:56 UTCVendor advisory
  60. 2026-10-04 00:56 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  61. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  62. 2026-10-03 13:05 UTCVendor advisory
  63. 2026-10-03 13:05 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  64. 2026-10-03 01:10 UTCEG score recompute
  65. 2026-10-03 01:10 UTCVendor advisory
  66. 2026-10-03 01:10 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  67. 2026-10-02 13:19 UTCVendor advisory
  68. 2026-10-02 13:19 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  69. 2026-10-02 01:27 UTCEG score recompute
  70. 2026-10-02 01:27 UTCVendor advisory
  71. 2026-10-02 01:27 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  72. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  73. 2026-10-01 13:37 UTCVendor advisory
  74. 2026-10-01 13:36 UTCGHSA enrichmentGHSA-937c-856w-w843 · GitHub CVSS 5.6
  75. 2026-10-01 01:45 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-78135?
CVE-2026-78135 is a high-severity vulnerability; its CVE record was published on September 11, 2026. 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.
When was the CVE record for CVE-2026-78135 published?
The CVE record for CVE-2026-78135 was published on September 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-78135 actively exploited?
CVE-2026-78135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-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?
A fix for CVE-2026-78135 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-78135 are linked in the Vendor Advisories panel on this page.

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