CVE-2026-51259

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, ghsa
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Unchecked unsigned integer overflow in buffer size calculation in schreibfaul1 ESP32-audioI2S 3.4.5 leads to undersized PSRAM buffer allocation. Subsequent normal audio buffer read and write operations cause heap out-of-bounds access, memory corruption, denial of service, and potential code execution.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

cveadvisory-/CVE-2026-51259 at main · programmervuln/cveadvisory- · GitHub

https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51259
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-2026-51259(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 15× in last 7d / 15× 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. 2026-07-29 13:00 UTCGHSA enrichment
  2. 2026-07-29 08:37 UTCGHSA enrichment
  3. 2026-07-29 04:15 UTCGHSA enrichment
  4. 2026-07-28 23:52 UTCEG score recompute
  5. 2026-07-28 23:52 UTCGHSA enrichment
  6. 2026-07-28 19:27 UTCEG score recompute
  7. 2026-07-28 19:27 UTCGHSA enrichment
  8. 2026-07-28 18:59 UTCEG score recompute▲ 9.80
  9. 2026-07-28 18:59 UTCGHSA enrichment
  10. 2026-07-28 18:57 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  11. 2026-07-28 16:24 UTCGHSA enrichment
  12. 2026-07-28 15:41 UTCGHSA enrichment
  13. 2026-07-28 15:37 UTCNVD update
  14. 2026-07-28 14:39 UTCEG score recompute
  15. 2026-07-28 14:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-51259?
CVE-2026-51259 is a critical vulnerability published on July 28, 2026. Unchecked unsigned integer overflow in buffer size calculation in schreibfaul1 ESP32-audioI2S 3.4.5 leads to undersized PSRAM buffer allocation. Subsequent normal audio buffer read and write operations cause heap out-of-bounds access, memory corruption, denial of service, and potential code…
When was CVE-2026-51259 disclosed?
CVE-2026-51259 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.
What is the CVSS score of CVE-2026-51259?
CVE-2026-51259 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51259?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51259, 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-2026-51259

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