CVE-2026-51261

✕ Withdrawn — historical dataCRITICALPre-NVD 9.8
9.8CVSS
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Missing mutex synchronization in AudioBuffer::freeSpace() in schreibfaul1 ESP32-audioI2S 3.4.5 creates a race condition between concurrent tasks. The function calculates available buffer space without protecting shared read/write pointers, returning an incorrectly large value. Trusting this value leads to heap out-of-bounds write, memory corruption, device crash, and arbitrary code execution.

CVSS v3
9.8
EchelonGraph score
Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
EG Score
—
EG Risk
—
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

ESP32-audioI2S/src/Audio.cpp at master · schreibfaul1/ESP32-audioI2S · GitHub

https://github.com/schreibfaul1/ESP32-audioI2S/blob/master/src/Audio.cpp
generic

cveadvisory-/CVE-2026-51261 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51261

Vendor Advisories for CVE-2026-51261(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 2× in last 7d / 11× 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. 2026-08-29 23:38 UTCGHSA enrichment
  2. 2026-08-26 00:36 UTCGHSA enrichment
  3. 2026-08-23 04:56 UTCGHSA enrichment
  4. 2026-08-20 09:15 UTCGHSA enrichment
  5. 2026-08-17 13:35 UTCGHSA enrichment
  6. 2026-08-14 17:55 UTCGHSA enrichment
  7. 2026-08-11 22:16 UTCGHSA enrichment
  8. 2026-08-09 02:37 UTCGHSA enrichment
  9. 2026-08-06 06:57 UTCGHSA enrichment
  10. 2026-08-03 11:18 UTCGHSA enrichment
  11. 2026-08-01 04:16 UTCEPSS rescore
  12. 2026-07-31 15:37 UTCEG score recompute▼ 9.80
  13. 2026-07-31 15:37 UTCGHSA enrichment
  14. 2026-07-31 11:39 UTCGHSA enrichment
  15. 2026-07-31 07:38 UTCGHSA enrichment
  16. 2026-07-31 03:40 UTCGHSA enrichment
  17. 2026-07-30 23:43 UTCEG score recompute
  18. 2026-07-30 23:43 UTCGHSA enrichment
  19. 2026-07-30 19:45 UTCGHSA enrichment
  20. 2026-07-30 18:00 UTCEG score recompute▲ 9.80
  21. 2026-07-30 17:59 UTCGHSA enrichment
  22. 2026-07-30 17:56 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  23. 2026-07-30 16:28 UTCEPSS rescore
  24. 2026-07-30 01:30 UTCEPSS rescore
  25. 2026-07-28 16:24 UTCGHSA enrichment
Show 4 more
  1. 2026-07-28 15:41 UTCGHSA enrichment
  2. 2026-07-28 15:37 UTCNVD update
  3. 2026-07-28 14:39 UTCEG score recompute
  4. 2026-07-28 14:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51261?
CVE-2026-51261 is a critical vulnerability published on July 28, 2026. Missing mutex synchronization in AudioBuffer::freeSpace() in schreibfaul1 ESP32-audioI2S 3.4.5 creates a race condition between concurrent tasks. The function calculates available buffer space without protecting shared read/write pointers, returning an incorrectly large value. Trusting this value…
When was CVE-2026-51261 disclosed?
CVE-2026-51261 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51261 actively exploited?
CVE-2026-51261 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 77.9% of all scored CVEs.
What is the CVSS score of CVE-2026-51261?
CVE-2026-51261 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51261?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51261, 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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