CVE-2026-49843 FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's JSON-RPC handler bound the connection to the client-supplied sessid on the fir...

CVE-2026-49843

FreeSWITCH vulnerability CVE-2026-49843 affects mod_verto before version 1.11.1. The JSON-RPC handler binds the client-supplied sessid on the first frame prior to authentication, inserting the connection into the global session hash and evicting any prior occupant on key collision (sending verto....

EUVD-2026-35492

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's JSON-RPC handler bound the connection to the client-supplied sessid on the fir...

EUVD-2026-35473

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's WebSocket frame loop intercepts a -prefixed speed-test protocol SPU / SPB / SP...

CVE-2026-49842

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's WebSocket frame loop intercepts a -prefixed speed-test protocol SPU / SPB / SP...

CVE-2026-49842

CVE-2026-49842 - FreeSWITCH mod_verto pre-auth bandwidth amplification : Before v1.11.1, FreeSWITCH’s mod_verto WebSocket frame loop processed a #-prefixed speed-test protocol (#SPU/#SPB/#SPE) prior to authentication. The payload size in #SPU was parsed with atoi() and non-positive values were re...

CVE-2026-49842 FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's WebSocket frame loop intercepts a -prefixed speed-test protocol SPU / SPB / SP...

CVE-2026-49841

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, the modverto HTTP request handler allocates a fixed 2 MiB buffer for a POST...

CVE-2026-49841

FreeSWITCH is affected by a pre-authentication heap overflow in the mod_verto HTTP POST body read. Before version 1.11.1, the mod_verto HTTP request handler allocates a fixed 2 MiB buffer for application/x-www-form-urlencoded bodies but accepts Content-Length up to just under 10 MiB. The body-rea...

CVE-2026-49841 FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, the modverto HTTP request handler allocates a fixed 2 MiB buffer for a POST...

CVE-2026-49840

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, eslrecvevent parses Content-Length with atol and passes the result straight to malloclen ...

CVE-2026-49840

CVE-2026-49840 affects FreeSWITCH libesl before version 1.11.1. The flaw occurs in esl_recv_event(): Content-Length is parsed with atol() and the result is passed to malloc(len + 1) without sign or magnitude checks, allowing a pre-authentication, remote attacker to corrupt the heap or crash the p...

EUVD-2026-35471

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, eslrecvevent parses Content-Length with atol and passes the result straight to malloclen ...

CVE-2026-49475 FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser...

EUVD-2026-35470

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser...

CVE-2026-49475 FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser...

CVE-2026-49475

FreeSWITCH (core STUN attribute parsing) is affected. Prior to version 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser casts to can cause an out-of-bounds read/write on the per-leg media buffer. The issue has been patched in version 1.11.0. The CVE’s...

CVE-2026-49472

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, FreeSWITCH includes a vulnerable function, PREFIXprologTok, in...

CVE-2026-49472 FreeSWITCH includes a vulnerable function, PREFIX(prologTok)() from libexpat

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, FreeSWITCH includes a vulnerable function, PREFIXprologTok, in...

CVE-2026-49472

CVE-2026-49472 affects FreeSWITCH (pre-1.11.0). The issue is a vulnerable PREFIX(prologTok)() in libs/xmlrpc-c/lib/expat/xmltok/xmltok_impl.c, cloned from an outdated libexpat lacking a security patch. Root cause: missing patch in the referenced expat-derived code. Impact: potential network-expos...