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).
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FreeBSD | FreeBSD | unknown |
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Solution
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Workaround
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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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MITRE
Status: PUBLISHED
Assigner: freebsd
Published:
Updated: 2026-08-19T05:20:00.559Z
Reserved: 2026-05-29T20:24:28.616Z
Link: CVE-2026-49420
Vulnrichment
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NVD
Status : Received
Published: 2026-08-19T06:17:40.790
Modified: 2026-08-19T06:17:40.790
Link: CVE-2026-49420
Redhat
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OpenCVE Enrichment
Updated: 2026-08-19T06:30:05Z