CVE-2026-19774

Root code execution via undersized codec buffer

Published Sep 15, 2026 · Updated Sep 15, 2026

Stack-based buffer overflow in BlueZ A2DP allows network-adjacent attackers to execute arbitrary code as root through a paired device. The store_remote_sep path encodes up to 255 codec-capability bytes as two-character hexadecimal values without reserving enough stack storage. The malicious Bluetooth device must first be paired, after which crafted stream-endpoint data can corrupt the bluetoothd stack.

CVSS severity7.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in BlueZ A2DP allows network-adjacent attackers to execute arbitrary code as root through a paired device. The store_remote_sep path encodes up to 255 codec-capability bytes as two-character hexadecimal values without reserving enough stack storage. The malicious Bluetooth device must first be paired, after which crafted stream-endpoint data can corrupt the bluetoothd stack.

The record

CVE
CVE-2026-19774
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
BlueZ
Product
BlueZ
Classifications
CWE-121, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=b138a0849ba26310c3f40e78037565ce274d8737

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

BlueZ · BlueZversion=b138a0849ba26310c3f40e78037565ce274d8737

Published CVSS scores

7.1Zero Day InitiativeCVSS:3.0/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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