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CVE-2026-49841

CRITICAL
9.8
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-49841
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-01 18:50 UTC
Published
2026-06-09 16:02 UTC
Last updated
2026-06-11 03:55 UTC
Primary CWE
CWE-122
CWE-122: Heap-based Buffer Overflow
Vendor / Product
signalwire / freeswitch
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
signalwire freeswitch — < 1.11.1
Weakness (CWE)
CWESourceDescription
CWE-122 cna CWE-122: Heap-based Buffer Overflow
CWE-131 cna CWE-131: Incorrect Calculation of Buffer Size
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (2)
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