What is CVE-2026-49840?

CVE-2026-49840 is a critical-severity vulnerability in Freeswitch, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-06-09.

How severe is CVE-2026-49840?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Buffer overflow in Freeswitch

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, esl_recv_event() parses Content…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

Freeswitch

Weakness classification (CWE)

CWE-20 — Improper Input Validation
CWE-122 — Heap-based Buffer Overflow
CWE-195
CWE-787 — Out-of-bounds Write

References

security-advisories@github.com (Release Notes)
security-advisories@github.com (Third Party Advisory)

Frequently asked questions

What is CVE-2026-49840?: CVE-2026-49840 is a critical-severity vulnerability in Freeswitch, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-06-09.
How severe is CVE-2026-49840?: Critical severity. CVSS v3 base score is 9.1 out of 10.