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
Trending — 3 sources updated this weekElevated
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: Elevated riskExposed: 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(medium)
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 PROB
0%
EPSS %ILE
23%
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 22× in last 7d / 106× 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 197 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.0% of all scored CVEs.
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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