CVE-2026-49841

Summary

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 mod_verto HTTP request handler allocates a fixed 2 MiB buffer for a POST application/x-www-form-urlencoded body but accepts Content-Length up to just under 10 MiB. The body-read loop is bounded by Content-Length rather than the buffer size, producing an attacker-controlled heap overflow of up to ~8 MiB – before the HTTP basic-auth check runs. This issue has been patched in version 1.11.1.

Affected Software

VendorProductVersion RangeStatus
signalwirefreeswitch< 1.11.1affected

Weaknesses

  • CWE-122: CWE-122: Heap-based Buffer Overflow
  • CWE-131: CWE-131: Incorrect Calculation of Buffer Size

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References