CVE-2026-498409.1CriticalCWE-20
signalwire freeswitch vulnerability
signalwire · freeswitch
Not in CISA KEVVendor fix available
0.3%probability of exploitation in the next 30 days
23rd percentile
050100
Higher than 23% of scored CVEs
9.1CriticalCVSS 3.1
LowMediumHighCrit.
DescriptionNVD
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, esl_recv_event() parses Content-Length with atol() and passes the result straight to malloc(len + 1) with no sign or magnitude check. A malicious or man-in-the-middle ESL peer can send a frame with a negative Content-Length to corrupt the heap of, or crash, any process linked against libesl, before the client has authenticated to that peer. This issue has been patched in version 1.11.1.
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 16 Jun.
- FreeSWITCH bugs allow remote code exec without auth, urgent patchSecurityOnline · first in our coverage · mentions it in passing
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