CVE-2026-51267

✕ Withdrawn — historical dataCRITICALPre-NVD 9.8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: 1%CVSS: 9.8Exploit: None knownExposed: 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 URL path concatenation and encoding module. The application splices untrusted extension path and attacker-controlled query string into a path buffer, then invokes urlencode without validating the final string length. Remote attackers can construct an oversized malicious URL path and query string to trigger out-of-bounds heap write, resulting in arbitrary code execution, information disclosure, service crash, or privilege escalation.

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Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.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
43%
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

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-2026-51267 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51267

Vendor Advisories for CVE-2026-51267(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 05:01 UTCGHSA enrichment
  2. 2026-09-11 01:51 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 19:24 UTCGHSA enrichment
  7. 2026-08-22 16:15 UTCGHSA enrichment
  8. 2026-08-19 13:04 UTCGHSA enrichment
  9. 2026-08-16 09:47 UTCGHSA enrichment
  10. 2026-08-13 06:38 UTCGHSA enrichment
  11. 2026-08-10 03:28 UTCGHSA enrichment
  12. 2026-08-07 00:19 UTCGHSA enrichment
  13. 2026-08-03 21:09 UTCGHSA enrichment
  14. 2026-08-01 04:16 UTCEPSS rescore
  15. 2026-07-31 18:00 UTCEG score recompute▼ 9.80
  16. 2026-07-31 18:00 UTCGHSA enrichment
  17. 2026-07-31 13:52 UTCGHSA enrichment
  18. 2026-07-31 09:44 UTCGHSA enrichment
  19. 2026-07-31 05:36 UTCGHSA enrichment
  20. 2026-07-31 01:27 UTCGHSA enrichment
  21. 2026-07-30 21:18 UTCGHSA enrichment
  22. 2026-07-30 17:11 UTCEG score recompute
  23. 2026-07-30 17:11 UTCGHSA enrichment
  24. 2026-07-30 16:28 UTCEPSS rescore
  25. 2026-07-30 13:04 UTCEG score recompute
Show 19 more
  1. 2026-07-30 13:04 UTCGHSA enrichment
  2. 2026-07-30 08:56 UTCGHSA enrichment
  3. 2026-07-30 04:48 UTCEG score recompute
  4. 2026-07-30 04:48 UTCGHSA enrichment
  5. 2026-07-30 01:30 UTCEPSS rescore
  6. 2026-07-30 00:37 UTCGHSA enrichment
  7. 2026-07-29 20:30 UTCGHSA enrichment
  8. 2026-07-29 16:12 UTCGHSA enrichment
  9. 2026-07-29 12:05 UTCGHSA enrichment
  10. 2026-07-29 07:57 UTCGHSA enrichment
  11. 2026-07-29 03:48 UTCGHSA enrichment
  12. 2026-07-28 23:37 UTCEG score recompute
  13. 2026-07-28 23:37 UTCGHSA enrichment
  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-2026-51267?
CVE-2026-51267 is a critical vulnerability published on July 28, 2026. schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the URL path concatenation and encoding module. The application splices untrusted extension path and attacker-controlled query string into a path buffer, then invokes urlencode without validating the final string…
When was CVE-2026-51267 disclosed?
CVE-2026-51267 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-2026-51267 actively exploited?
CVE-2026-51267 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 57.5% of all scored CVEs.
What is the CVSS score of CVE-2026-51267?
CVE-2026-51267 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51267?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51267, 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-2026-51267

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