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CVE-2026-49841 is a heap-based buffer overflow in FreeSWITCH's mod_verto HTTP request handler affecting versions prior to 1.11.1. For POST requests with content type application/x-www-form-urlencoded, the handler allocates a fixed 2 MiB heap buffer but accepts a Content-Length of just under 10 MiB. The body-read loop is bounded by the attacker-supplied Content-Length rather than the actual allocated buffer size, allowing attacker-controlled data to overflow the heap by up to approximately 8 MiB. The overflow occurs before the HTTP basic-authentication check is performed, making the flaw reachable pre-authentication over the network when the vulnerable verto endpoint is exposed.
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A critical pre-authentication heap buffer overflow in the FreeSWITCH mod_verto HTTP request handler that can lead to crashes and possible remote code execution.
A heap overflow vulnerability in FreeSWITCH mod_verto's HTTP request handler, caused by reading attacker-controlled POST body data based on Content-Length into a fixed 2 MiB buffer, potentially allowing overflow before authentication.
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.