CVE-2026-56786

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-25. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
34.0%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

RTKLIB 2.4.3 - Out-of-bounds Write in decode_type1033 via Crafted RTCM3 Message | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rtklib-out-of-bounds-write-in-decode-type1033-via-crafted-rtcm3-message
generic🟡 PoC Available

Out-of-Bounds Write in RTKLIB decode_type1033 via Unbounded RTCM3 Antenna/Receiver Descriptor Lengths · Issue #799 · tomojitakasu/RTKLIB · GitHub

https://github.com/tomojitakasu/RTKLIB/issues/799

Vendor Advisories for CVE-2026-56786(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 96× in last 7d / 153× 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 153 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56786?
CVE-2026-56786 is a critical vulnerability published on June 25, 2026. RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decodetype1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can…
When was CVE-2026-56786 disclosed?
CVE-2026-56786 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56786 actively exploited?
CVE-2026-56786 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56786?
CVE-2026-56786 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-56786?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56786, 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.

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