The 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).

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History

Thu, 20 Aug 2026 05:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Wed, 19 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Freebsd
Freebsd freebsd
Vendors & Products Freebsd
Freebsd freebsd

Wed, 19 Aug 2026 05:45:00 +0000

Type Values Removed Values Added
Description The 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).
Title Buffer overflow in libalias RTSP handler
Weaknesses CWE-121
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-08-20T03:55:48.116Z

Reserved: 2026-05-29T20:24:28.616Z

Link: CVE-2026-49420

cve-icon Vulnrichment

Updated: 2026-08-19T12:13:28.892Z

cve-icon NVD

Status : Received

Published: 2026-08-19T06:17:40.790

Modified: 2026-08-20T04:16:50.603

Link: CVE-2026-49420

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T17:30:03Z

Weaknesses