CVE-2026-87961Network attack vector

Device crash or heap disclosure via shadowed length

Published Sep 10, 2026 · Updated Sep 10, 2026

Heap-based out-of-bounds read in ESP32-audioI2S 3.4.4 through 4.0.0 allows remote attackers to crash devices or read heap memory. In read_ID3_Header, synchronized-lyrics processing shadows the input length and trusts an oversized ID3 frame declaration when reading the allocated audio buffer. A crafted MP3 file or HTTP audio stream must reach firmware containing the library; successful access can interrupt playback through a device crash or expose adjacent heap contents.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based out-of-bounds read in ESP32-audioI2S 3.4.4 through 4.0.0 allows remote attackers to crash devices or read heap memory. In read_ID3_Header, synchronized-lyrics processing shadows the input length and trusts an oversized ID3 frame declaration when reading the allocated audio buffer. A crafted MP3 file or HTTP audio stream must reach firmware containing the library; successful access can interrupt playback through a device crash or expose adjacent heap contents.

The record

CVE
CVE-2026-87961
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
schreibfaul1
Product
ESP32-audioI2S
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.4.4 <=4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

schreibfaul1 · ESP32-audioI2Sversion=3.4.4 <=4.0.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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