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CVE-2026-49420 is a stack-based buffer overflow in FreeBSD’s libalias network address translation library, specifically in RTSP handling used during NAT processing. The vulnerable RTSP helper rewrites outgoing packets into a fixed-length stack buffer without verifying that the rewritten data fits within the buffer or within the original packet bounds. The issue is reachable when attacker-controlled RTSP traffic is processed through libalias by components such as ipfw NAT or natd, including RTSP-aware helper functionality associated with alias_smedia.ko and libalias_smedia.so. Successful exploitation can crash the affected system or process and may permit remote code execution; in exposed configurations this execution may occur in kernel context or in the natd process, which typically runs as root.
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No public exploit code observed for this vulnerability.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A FreeBSD vulnerability cited as an example of shared attribution across multiple AI-assisted discovery paths; no technical details are provided.
A stack overflow vulnerability in FreeBSD's libalias network address translation library that can be triggered via applications passing attacker-controlled traffic, leading to denial of service and potentially code execution.
A FreeBSD libalias vulnerability in RTSP/NAT handling that can allow remote code execution as root via specially crafted RTSP traffic.
A remote code execution vulnerability in FreeBSD's libalias RTSP handling that can be triggered via specially crafted RTSP traffic traversing NAT, potentially leading to code execution as root through natd or related components.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.