CVE-2026-51266

✕ Withdrawn — historical dataCRITICALPre-NVD 9.8Elevated
9.8CVSS
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the HTTP request header construction logic. The application dynamically splices attacker-controlled host name, path, query string, and multiple HTTP header fields into a fixed ps_ptr heap buffer without proper size limitation and boundary validation. Remote attackers can use an oversized crafted network request parameter to trigger out-of-bounds heap write, leading to 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Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.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
1%
EPSS %ILE
47%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

cveadvisory-/CVE-2026-51266 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51266
generic

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

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

Vendor Advisories for CVE-2026-51266(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 / 8× 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. 2026-09-14 01:08 UTCGHSA enrichment
  2. 2026-09-10 23:06 UTCGHSA enrichment
  3. 2026-09-07 20:57 UTCGHSA enrichment
  4. 2026-09-04 12:09 UTCGHSA enrichment
  5. 2026-08-29 23:38 UTCGHSA enrichment
  6. 2026-08-25 08:35 UTCGHSA enrichment
  7. 2026-08-22 06:34 UTCGHSA enrichment
  8. 2026-08-19 04:33 UTCGHSA enrichment
  9. 2026-08-16 02:30 UTCGHSA enrichment
  10. 2026-08-13 00:29 UTCGHSA enrichment
  11. 2026-08-09 22:29 UTCGHSA enrichment
  12. 2026-08-06 20:28 UTCGHSA enrichment
  13. 2026-08-03 18:28 UTCGHSA enrichment
  14. 2026-08-01 04:16 UTCEPSS rescore
  15. 2026-07-31 16:27 UTCEG score recompute▼ 9.80
  16. 2026-07-31 16:27 UTCGHSA enrichment
  17. 2026-07-31 12:06 UTCGHSA enrichment
  18. 2026-07-31 07:48 UTCGHSA enrichment
  19. 2026-07-31 03:30 UTCGHSA enrichment
  20. 2026-07-30 23:14 UTCGHSA enrichment
  21. 2026-07-30 18:57 UTCEG score recompute
  22. 2026-07-30 18:57 UTCGHSA enrichment
  23. 2026-07-30 16:28 UTCEPSS rescore
  24. 2026-07-30 14:40 UTCGHSA enrichment
  25. 2026-07-30 10:12 UTCEG score recompute
Show 19 more
  1. 2026-07-30 10:12 UTCGHSA enrichment
  2. 2026-07-30 05:55 UTCGHSA enrichment
  3. 2026-07-30 01:38 UTCEG score recompute
  4. 2026-07-30 01:38 UTCGHSA enrichment
  5. 2026-07-30 01:30 UTCEPSS rescore
  6. 2026-07-29 21:11 UTCGHSA enrichment
  7. 2026-07-29 16:52 UTCGHSA enrichment
  8. 2026-07-29 12:35 UTCGHSA enrichment
  9. 2026-07-29 08:18 UTCGHSA enrichment
  10. 2026-07-29 04:01 UTCGHSA enrichment
  11. 2026-07-28 23:44 UTCEG score recompute
  12. 2026-07-28 23:44 UTCGHSA enrichment
  13. 2026-07-28 19:27 UTCEG score recompute
  14. 2026-07-28 19:27 UTCGHSA enrichment
  15. 2026-07-28 18:24 UTCEG score recompute▲ 9.80
  16. 2026-07-28 18:22 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  17. 2026-07-28 16:19 UTCNVD update
  18. 2026-07-28 15:30 UTCEG score recompute
  19. 2026-07-28 15:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-51266?
CVE-2026-51266 is a critical vulnerability published on July 28, 2026. schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the HTTP request header construction logic. The application dynamically splices attacker-controlled host name, path, query string, and multiple HTTP header fields into a fixed ps_ptr heap buffer without proper size…
When was CVE-2026-51266 disclosed?
CVE-2026-51266 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51266 actively exploited?
CVE-2026-51266 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 53.5% of all scored CVEs.
What is the CVSS score of CVE-2026-51266?
CVE-2026-51266 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51266, 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

Explore the affected products and dependency analysis for CVE-2026-51266

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