CVE-2026-56790

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.3Exploit: NoneExposed: 0

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

CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
12.1%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

CANBoat - Off-by-One Global Buffer Overflow in searchForPgn() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn
github_pr

fix: prevent out-of-bounds read for out-of-range PGNs

Fix merged in canboat/canboat PR #649 on 2026-06-24 — awaiting tagged release

https://github.com/canboat/canboat/pull/649
generic🟡 PoC Available

Global-Buffer-Overflow in CANBoat `searchForPgn` via Out-of-Range NMEA-2000 PGN (Binary-Search Off-By-One) · Issue #644 · canboat/canboat · GitHub

https://github.com/canboat/canboat/issues/644
github_commit

commit a5a22b74b9ac (canboat/canboat)

Fix landed in canboat/canboat commit a5a22b74b9ac — awaiting tagged release

https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f

Vendor Advisories for CVE-2026-56790(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.

Data Freshness Timeline

(refreshed 10× in last 7d / 81× 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. 2026-07-23 03:20 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 02:35 UTCGHSA enrichment
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-16 14:10 UTCGHSA enrichment
  11. 2026-07-16 01:31 UTCGHSA enrichment
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 13:10 UTCGHSA enrichment
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-15 02:00 UTCEPSS rescore
  17. 2026-07-15 00:49 UTCGHSA enrichment
  18. 2026-07-14 12:20 UTCGHSA enrichment
  19. 2026-07-14 00:00 UTCGHSA enrichment
  20. 2026-07-13 22:31 UTCEPSS rescore
  21. 2026-07-13 11:40 UTCGHSA enrichment
  22. 2026-07-13 06:13 UTCEPSS rescore
  23. 2026-07-13 06:13 UTCEPSS rescore
  24. 2026-07-12 23:16 UTCGHSA enrichment
  25. 2026-07-12 10:56 UTCGHSA enrichment
Show 56 more
  1. 2026-07-11 22:36 UTCGHSA enrichment
  2. 2026-07-11 10:16 UTCGHSA enrichment
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-10 21:55 UTCGHSA enrichment
  6. 2026-07-10 09:35 UTCGHSA enrichment
  7. 2026-07-09 21:01 UTCGHSA enrichment
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 19:10 UTCEPSS rescore
  10. 2026-07-09 08:41 UTCGHSA enrichment
  11. 2026-07-08 20:19 UTCGHSA enrichment
  12. 2026-07-08 15:16 UTCEPSS rescore
  13. 2026-07-08 15:16 UTCEPSS rescore
  14. 2026-07-08 07:52 UTCGHSA enrichment
  15. 2026-07-07 19:32 UTCGHSA enrichment
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 06:56 UTCGHSA enrichment
  19. 2026-07-06 18:32 UTCGHSA enrichment
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 06:11 UTCGHSA enrichment
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-05 17:35 UTCGHSA enrichment
  26. 2026-07-05 05:15 UTCGHSA enrichment
  27. 2026-07-05 02:31 UTCEPSS rescore
  28. 2026-07-05 02:30 UTCEPSS rescore
  29. 2026-07-04 16:49 UTCGHSA enrichment
  30. 2026-07-04 06:31 UTCEPSS rescore
  31. 2026-07-04 06:31 UTCEPSS rescore
  32. 2026-07-04 04:06 UTCGHSA enrichment
  33. 2026-07-03 15:40 UTCGHSA enrichment
  34. 2026-07-03 03:20 UTCGHSA enrichment
  35. 2026-07-02 15:00 UTCGHSA enrichment
  36. 2026-07-02 02:40 UTCGHSA enrichment
  37. 2026-07-01 15:07 UTCEPSS rescore
  38. 2026-07-01 14:20 UTCGHSA enrichment
  39. 2026-07-01 02:00 UTCGHSA enrichment
  40. 2026-06-30 23:22 UTCEPSS rescore
  41. 2026-06-30 13:39 UTCGHSA enrichment
  42. 2026-06-30 01:18 UTCGHSA enrichment
  43. 2026-06-29 14:06 UTCEPSS rescore
  44. 2026-06-29 12:58 UTCGHSA enrichment
  45. 2026-06-29 00:38 UTCGHSA enrichment
  46. 2026-06-28 14:07 UTCEPSS rescore
  47. 2026-06-28 12:17 UTCGHSA enrichment
  48. 2026-06-28 04:56 UTCEPSS rescore
  49. 2026-06-28 04:56 UTCEPSS rescore
  50. 2026-06-27 23:57 UTCGHSA enrichment
  51. 2026-06-27 11:37 UTCGHSA enrichment
  52. 2026-06-27 03:08 UTCEPSS rescore
  53. 2026-06-26 23:16 UTCGHSA enrichment
  54. 2026-06-26 10:56 UTCGHSA enrichment
  55. 2026-06-25 19:49 UTCEG score recompute
  56. 2026-06-25 19:49 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-56790?
CVE-2026-56790 is a high vulnerability published on June 25, 2026. CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or…
When was CVE-2026-56790 disclosed?
CVE-2026-56790 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56790 actively exploited?
CVE-2026-56790 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56790?
CVE-2026-56790 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-56790?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56790, 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

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