CVE-2026-51270

✕ Withdrawn — historical dataHIGHPre-NVD 8.8Elevated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 htmlToUTF8() HTML entity decoding function. The function parses attacker-controlled malicious HTML entities and uses memmove and memcpy to rearrange string content without validating buffer remaining size and boundary limits. Crafted oversized HTML entity strings can trigger heap out-of-bounds write, allowing remote code execution, memory information leakage, service crash or privilege escalation.

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Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.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 30, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

cveadvisory-/CVE-2026-51270 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51270
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-2026-51270(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 / 10× 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. 2026-08-27 20:58 UTCGHSA enrichment
  2. 2026-08-24 20:13 UTCGHSA enrichment
  3. 2026-08-21 20:07 UTCGHSA enrichment
  4. 2026-08-18 20:02 UTCGHSA enrichment
  5. 2026-08-15 19:58 UTCGHSA enrichment
  6. 2026-08-12 19:53 UTCGHSA enrichment
  7. 2026-08-09 19:48 UTCGHSA enrichment
  8. 2026-08-06 19:44 UTCGHSA enrichment
  9. 2026-08-03 19:40 UTCGHSA enrichment
  10. 2026-08-01 04:16 UTCEPSS rescore
  11. 2026-07-31 19:35 UTCEG score recompute▼ 8.80
  12. 2026-07-31 19:35 UTCGHSA enrichment
  13. 2026-07-31 07:40 UTCEG score recompute
  14. 2026-07-31 07:40 UTCGHSA enrichment
  15. 2026-07-30 19:45 UTCEG score recompute
  16. 2026-07-30 19:45 UTCGHSA enrichment
  17. 2026-07-30 18:00 UTCEG score recompute▲ 8.80
  18. 2026-07-30 18:00 UTCGHSA enrichment
  19. 2026-07-30 17:56 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  20. 2026-07-30 16:28 UTCEPSS rescore
  21. 2026-07-30 01:30 UTCEPSS rescore
  22. 2026-07-28 16:19 UTCNVD update
  23. 2026-07-28 15:30 UTCEG score recompute
  24. 2026-07-28 15:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51270?
CVE-2026-51270 is a high vulnerability published on July 28, 2026. schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the htmlToUTF8() HTML entity decoding function. The function parses attacker-controlled malicious HTML entities and uses memmove and memcpy to rearrange string content without validating buffer remaining size and…
When was CVE-2026-51270 disclosed?
CVE-2026-51270 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-2026-51270 actively exploited?
CVE-2026-51270 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-2026-51270?
CVE-2026-51270 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51270?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51270, 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-2026-51270

Explore →

Is Your Infrastructure Affected by CVE-2026-51270?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs