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).
Analysis
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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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Tracking
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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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Subscriptions
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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
No data.
OpenCVE Enrichment
Updated: 2026-08-19T06:30:05Z
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CWE-121
Stack-based Buffer Overflow