Buffer overflow in libalias RTSP handler

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-49420
StatePUBLISHED
Assignerfreebsd
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 06:17:40 UTC
Updated2026-08-19 06:17:40 UTC
DescriptionThe RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet. A host sending crafted RTSP traffic from inside a NAT gateway using libalias can overflow a stack buffer, potentially achieving remote code execution in the kernel (when using ipfw(4) NAT) or in the natd(8) process (which generally runs as the root user).

Risk And Classification

Problem Types: CWE-121 | CWE-121 CWE-121: Stack-based Buffer Overflow

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FreeBSD FreeBSD affected 15.1-RELEASE p1 release Not specified
CNA FreeBSD FreeBSD affected 15.0-RELEASE p11 release Not specified
CNA FreeBSD FreeBSD affected 14.4-RELEASE p7 release Not specified
CNA FreeBSD FreeBSD affected 14.3-RELEASE p16 release Not specified

References

ReferenceSourceLinkTags
security.freebsd.org/advisories/FreeBSD-SA-26:41.libalias.asc [email protected] security.freebsd.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Atuin - Automated Vulnerability Discovery Engine, Tianchu Chen of Tencent Xuanwu Lab (en)

CNA: UC Berkeley Antiproof (en)

CNA: Stanislav Fort of Aisle Research (en)

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