CVE-2026-51269

✕ Withdrawn — historical dataHIGHPre-NVD 8.8Elevated
8.8CVSS
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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 connecttospeech() function. The application accepts attacker-controlled long speech text input, performs URL encoding, and directly appends the encoded result into a fixed ps_ptr heap buffer when constructing HTTP TTS request headers. Lack of input length validation and boundary checking allows remote attackers to craft oversized input to trigger out-of-bounds heap write, resulting in arbitrary code execution.

CVSS v3
8.8
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Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.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
35%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

cveadvisory-/CVE-2026-51269 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51269
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-2026-51269(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 06:42 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. 2026-08-26 12:09 UTCGHSA enrichment
  7. 2026-08-23 07:14 UTCGHSA enrichment
  8. 2026-08-20 02:24 UTCGHSA enrichment
  9. 2026-08-16 21:33 UTCGHSA enrichment
  10. 2026-08-13 16:42 UTCGHSA enrichment
  11. 2026-08-10 11:27 UTCGHSA enrichment
  12. 2026-08-07 06:36 UTCGHSA enrichment
  13. 2026-08-04 01:46 UTCGHSA enrichment
  14. 2026-08-01 04:16 UTCEPSS rescore
  15. 2026-07-31 20:55 UTCEG score recompute▼ 8.80
  16. 2026-07-31 20:55 UTCGHSA enrichment
  17. 2026-07-31 08:41 UTCGHSA enrichment
  18. 2026-07-30 20:26 UTCEG score recompute
  19. 2026-07-30 20:26 UTCGHSA enrichment
  20. 2026-07-30 16:28 UTCEPSS rescore
  21. 2026-07-30 07:27 UTCEG score recompute
  22. 2026-07-30 07:27 UTCGHSA enrichment
  23. 2026-07-30 01:30 UTCEPSS rescore
  24. 2026-07-29 18:57 UTCGHSA enrichment
  25. 2026-07-29 06:42 UTCEG score recompute
Show 7 more
  1. 2026-07-29 06:42 UTCGHSA enrichment
  2. 2026-07-28 18:27 UTCEG score recompute
  3. 2026-07-28 17:53 UTCEG score recompute▲ 8.80
  4. 2026-07-28 17:53 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  5. 2026-07-28 16:19 UTCNVD update
  6. 2026-07-28 15:30 UTCEG score recompute
  7. 2026-07-28 15:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51269?
CVE-2026-51269 is a high vulnerability published on July 28, 2026. schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the connecttospeech() function. The application accepts attacker-controlled long speech text input, performs URL encoding, and directly appends the encoded result into a fixed ps_ptr heap buffer when constructing…
When was CVE-2026-51269 disclosed?
CVE-2026-51269 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-2026-51269 actively exploited?
CVE-2026-51269 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 64.6% of all scored CVEs.
What is the CVSS score of CVE-2026-51269?
CVE-2026-51269 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51269?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51269, 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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