Heap-based buffer overflow in shairport-sync - #VU147256
Published: September 7, 2026
Vulnerability identifier: #VU147256
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper bounds checking resulting in a heap-based buffer overflow in unencrypted_packet_decode() when decoding oversized UDP audio packets during a classic-AirPlay session. A remote attacker can send an oversized UDP audio packet to cause a denial of service.
Only classic builds using the deprecated Hammerton ALAC decoder are affected; AirPlay-2-only builds do not use this audio path.
Affected software
shairport-sync
Remediation
Install security update from vendor's website.
shairport-sync - update to 5.5