CVE-2026-38971

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-02. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: Elevated riskExposed: 0

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

ardupilot through Plane-4.6.3 was found to contain an out-of-bounds read issue in libraries/GCS_MAVLink/GCS_serial_control.cpp in GCS_MAVLINK::handle_serial_control().

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

July 2, 2026

Last Modified

July 9, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

[BUG] Uninitialized Byte Propagation in ArduPilot's Live MAVLink SERIAL_CONTROL Forwarding Path · Issue #32524 · ArduPilot/ardupilot · GitHub

https://github.com/ArduPilot/ardupilot/issues/32524
github_pr

GCS_MAVLink: fix buffer overread on invalid SERIAL_CONTROL write

Fix merged in ArduPilot/ardupilot PR #32587 on 2026-03-29 — awaiting tagged release

https://github.com/ArduPilot/ardupilot/pull/32587
generic

GitHub - ArduPilot/ardupilot: ArduPlane, ArduCopter, ArduRover, ArduSub source · GitHub

https://github.com/ArduPilot/ardupilot
generic

Unchecked MAVLink SERIAL_CONTROL count causes out-of-bounds read in ArduPilot · GitHub

https://gist.github.com/quart27219/6bfcc615f89fb493d02aad480704593b

Vendor Advisories for CVE-2026-38971(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 11× in last 7d / 119× 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 347 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-38971?
CVE-2026-38971 is a critical vulnerability published on July 2, 2026. ardupilot through Plane-4.6.3 was found to contain an out-of-bounds read issue in libraries/GCSMAVLink/GCSserialcontrol.cpp in GCSMAVLINK::handleserialcontrol().
When was CVE-2026-38971 disclosed?
CVE-2026-38971 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38971 actively exploited?
CVE-2026-38971 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.6% of all scored CVEs.
What is the CVSS score of CVE-2026-38971?
CVE-2026-38971 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38971?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38971, 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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