CVE-2026-49840

Name
CVE-2026-49840
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, 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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security-advisories@github.com https://github.com/signalwire/freeswitch/releases/tag/v1.11.1
security-advisories@github.com https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:* freeswitch >= None < 1.11.1

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
freeswitch edge-main 1.10.12-r5 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.12-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.12-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.12-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.12-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.12-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.11-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.11-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.11-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch edge-main 1.10.7-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.24-main 1.10.12-r5 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.23-main 1.10.12-r5 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.23-main 1.10.12-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.22-main 1.10.12-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.22-main 1.10.12-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.22-main 1.10.12-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.22-main 1.10.12-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.22-main 1.10.11-r0 None possibly vulnerable
freeswitch 3.22-main 1.10.7-r0 None possibly vulnerable
freeswitch 3.21-main 1.10.11-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.21-main 1.10.11-r0 None possibly vulnerable
freeswitch 3.21-main 1.10.7-r0 None possibly vulnerable
freeswitch 3.20-main 1.10.11-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.20-main 1.10.7-r0 None possibly vulnerable
freeswitch 3.19-main 1.10.11-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
freeswitch 3.19-main 1.10.7-r0 None possibly vulnerable