CVE-2026-51274
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn schreibfaul1 ESP32-audioI2S 3.4.5, a heap-based buffer overflow in the ID3v2 SYLT synchronized lyrics parser in audiolib allows remote attackers to cause a denial of service (application crash), information disclosure, or potential arbitrary code execution via a crafted MP3 file. The vulnerability occurs due to missing bounds validation on attacker-controlled frame size and improper memory access during lyric parsing.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceHeap-based buffer overflow in the ID3v2 SYLT synchronized lyrics parser of the ESP32-audioI2S library (v3.4.5). The parser fails to validate bounds on attacker-controlled frame size values from crafted MP3 files, leading to out-of-bounds memory access during lyric parsing.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify ESP32-audioI2S library usageSearch project dependencies (platformio.ini, Arduino library.json, or CMakeLists.txt) for 'ESP32-audioI2S' and note the version numberAffected if The library version is 3.4.5 or if version is unspecified but the library is present in a project using MP3 playback with lyrics support
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Locate the library version in the codebaseCheck the library.properties file or the header file (Audio.h or similar) within the ESP32-audioI2S library folder for the version definitionAffected if The reported version matches 3.4.5 exactly or falls within the v3.4.x branch where the vulnerability exists
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Determine if SYLT parsing is enabledReview the source code for calls to functions that process ID3v2 SYLT frames (look for 'SYLT', 'synced lyrics', or 'ID3v2' in the parsing logic)Affected if The code explicitly parses SYLT frames from ID3v2 tags, which is the vulnerable code path
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Inspect MP3 file processing logicSearch for code that reads MP3 file metadata and extracts frame size values from ID3v2 headers without bounds checkingAffected if The MP3 parser extracts frame size from SYLT frames and uses it directly for memory allocation without validating it against buffer limits
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Check for untrusted MP3 input sourcesAudit where MP3 files originate in the application (SD card, network stream, OTA update, user upload) and whether these sources can contain crafted contentAffected if The application processes MP3 files from untrusted or external sources without sanitization before passing them to the SYLT parser
A user is affected if they use ESP32-audioI2S library v3.4.5 and process MP3 files containing ID3v2 SYLT synchronized lyrics frames from any untrusted source.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement rigorous bounds validation on frame size fields before memory allocation and access in the SYLT parser; validate that frame sizes do not exceed available buffer space; consider updating to a patched version if available, or disable SYLT parsing as a workaround.
- Consultation3.0 h
- Implementation6.0 h
- Testing5.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-51274 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-51274 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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