CVE-2026-56790

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM 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
Elevated
7.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.3Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
7.3HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
0.3%
EPSS %ILE
21st
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 7× in last 7d / 33× 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.

Showing the most recent 100 of 246 total refreshes for this CVE.

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

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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 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 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56790?
CVE-2026-56790 has a CVSS base score of 7.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56790?
An upstream fix for CVE-2026-56790 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-56790 are linked in the Vendor Advisories panel on this page.

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