CVE-2026-51376

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

An issue in BitChat for iOS v1.15.0 allows a remote attacker to cause a denial of service via an unauthenticated MESSAGE packet into the mesh gossip cache

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Sep 1, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr.
github_pr Patch Available

Fix iOS BLE mesh authentication issues in BLEService

Patch available: permissionlesstech/bitchat v1.5.1 (PR #998 merged 2026-01-28)

https://github.com/permissionlesstech/bitchat/pull/998
generic

GitHub - BARGHEST-ngo/PoC_Bitchat1.15.0_iOS-BLEcache-poisoning: PoC of BLE cache poisoning attack · GitHub

https://github.com/BARGHEST-ngo/PoC_Bitchat1.15.0_iOS-BLEcache-poisoning
generic🟡 PoC Available

BitChat cache poisoning and replay in Bluetooth mesh

https://barghest.asia/blog/bitchat-cache-poisoning/

Vendor Advisories for CVE-2026-51376(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 18× in last 7d / 56× 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.

  1. 2026-09-19 10:01 UTCEG score recompute
  2. 2026-09-19 10:01 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 08:45 UTCEG score recompute
  5. 2026-09-18 08:45 UTCGHSA enrichment
  6. 2026-09-17 07:57 UTCEG score recompute
  7. 2026-09-17 07:57 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 07:09 UTCEG score recompute
  10. 2026-09-16 07:09 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 06:20 UTCEG score recompute
  13. 2026-09-15 06:20 UTCGHSA enrichment
  14. 2026-09-14 05:31 UTCEG score recompute
  15. 2026-09-14 05:31 UTCGHSA enrichment
  16. 2026-09-13 16:47 UTCEPSS rescore
  17. 2026-09-13 04:43 UTCEG score recompute
  18. 2026-09-13 04:43 UTCGHSA enrichment
  19. 2026-09-12 03:55 UTCEG score recompute
  20. 2026-09-12 03:55 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 03:06 UTCEG score recompute
  23. 2026-09-11 03:06 UTCGHSA enrichment
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-10 02:17 UTCGHSA enrichment
Show 31 more
  1. 2026-09-09 01:29 UTCEG score recompute
  2. 2026-09-09 01:29 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 00:41 UTCEG score recompute
  5. 2026-09-08 00:41 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 23:53 UTCEG score recompute
  8. 2026-09-06 23:53 UTCGHSA enrichment
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 23:00 UTCEG score recompute
  11. 2026-09-05 23:00 UTCGHSA enrichment
  12. 2026-09-04 22:11 UTCEG score recompute
  13. 2026-09-04 22:10 UTCGHSA enrichment
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-03 21:17 UTCGHSA enrichment
  16. 2026-09-02 20:26 UTCEG score recompute
  17. 2026-09-02 20:26 UTCGHSA enrichment
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 19:18 UTCEG score recompute▲ 6.50
  20. 2026-09-01 19:18 UTCGHSA enrichment
  21. 2026-09-01 19:17 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-31 19:35 UTCEG score recompute
  25. 2026-08-31 19:35 UTCGHSA enrichment
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-28 21:38 UTCGHSA enrichment
  29. 2026-08-28 20:24 UTCNVD update
  30. 2026-08-28 19:41 UTCEG score recompute
  31. 2026-08-28 19:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-51376?
CVE-2026-51376 is a medium vulnerability published on August 28, 2026. An issue in BitChat for iOS v1.15.0 allows a remote attacker to cause a denial of service via an unauthenticated MESSAGE packet into the mesh gossip cache
When was CVE-2026-51376 disclosed?
CVE-2026-51376 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51376 actively exploited?
CVE-2026-51376 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 81.7% of all scored CVEs.
What is the CVSS score of CVE-2026-51376?
CVE-2026-51376 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51376?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51376, 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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