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CVE-2026-49420 is a stack-based buffer overflow in the RTSP handler of FreeBSD's libalias network address translation library. The flaw arises because the handler rewrites outgoing RTSP packets into a fixed-length stack buffer without verifying that the rewritten data fits within that buffer, and without ensuring that the rewritten result fits back into the original packet. When attacker-controlled RTSP traffic is processed through libalias in NAT configurations, this unsafe rewrite logic can corrupt stack memory. The vulnerable functionality is exposed through FreeBSD NAT components that use libalias for RTSP-aware aliasing, including ipfw NAT and natd.
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A stack-based buffer overflow in the RTSP handler of FreeBSD libalias that can allow crafted RTSP traffic from inside a NAT gateway to potentially achieve remote code execution in the kernel or natd process.
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.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.