CVE-2026-54412

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-06-14. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

LiamBindle MQTT-C through version 1.1.6 contains a heap-based out-of-bounds read and integer underflow in the mqtt_unpack_publish_response function in src/mqtt.c that allows a remote unauthenticated attacker controlling an MQTT broker - or able to inject MQTT traffic into an unencrypted session - to crash a subscribed MQTT-C client and potentially disclose adjacent heap memory by sending a single crafted PUBLISH packet.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

June 14, 2026

Last Modified

August 10, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

CWE - CWE-191: Integer Underflow (Wrap or Wraparound) (4.20)

https://cwe.mitre.org/data/definitions/191.html
generic🔴 Active Exploitation

CWE - CWE-125: Out-of-bounds Read (4.20)

https://cwe.mitre.org/data/definitions/125.html
generic

MQTT-C/src/mqtt.c at v1.1.6 · LiamBindle/MQTT-C · GitHub

https://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334
generic

GitHub - LiamBindle/MQTT-C: A portable MQTT C client for embedded systems and PCs alike. · GitHub

https://github.com/LiamBindle/MQTT-C

Vendor Advisories for CVE-2026-54412(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 41× 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 245 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54412?
CVE-2026-54412 is a high vulnerability published on June 14, 2026. LiamBindle MQTT-C through version 1.1.6 contains a heap-based out-of-bounds read and integer underflow in the mqttunpackpublish_response function in src/mqtt.c that allows a remote unauthenticated attacker controlling an MQTT broker - or able to inject MQTT traffic into an unencrypted session - to…
When was CVE-2026-54412 disclosed?
CVE-2026-54412 was first published in the National Vulnerability Database on June 14, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54412 actively exploited?
CVE-2026-54412 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 65.7% of all scored CVEs.
What is the CVSS score of CVE-2026-54412?
CVE-2026-54412 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-54412?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54412, 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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