VulnerabilityPublished 5 Nov 2026

CVE-2026-116782: signalwire freeswitch · Out-of-bounds Read

Affects signalwire freeswitchSource CVE Database V5

Compare

Not known to be exploited · CVSS 7.5 High : upgrade to 1.11.2 soon.

Data as of 5 Nov 2026, 20:05 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	7.5

Patch: Available – fixed in 1.11.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade signalwire freeswitch to 1.11.2.

Affected software

Product	Affected	Fixed in
signalwirefreeswitch	Affected <1.11.2	Fixed in 1.11.2

AI-suggested

Upgrade FreeSWITCH to version 1.11.2 or later, where this vulnerability is fixed. Since the mod_rtmp module is disabled by default in stock builds and configurations, ensure it remains disabled if not required. No other mitigation or workaround is documented.

Description

CVE-2026-116782 is an out-of-bounds read vulnerability in FreeSWITCH's mod_rtmp module prior to version 1.11.2. The flaw occurs because the function rtmp_i_connect() passes an RTMP connect argument to amf0_object_get() without verifying that the AMF value is an object. This can cause invalid memory reads and crashes when a malformed connect command is sent by a client. The vulnerability leads to denial of service by crashing FreeSWITCH and terminating active calls. No memory corruption, data disclosure, or code execution has been demonstrated. The issue is fixed in FreeSWITCH version 1.11.2.

Impact

Successful exploitation results in a denial-of-service condition by crashing the FreeSWITCH server and terminating all active calls. There is no indication of data leakage, privilege escalation, or remote code execution. The attack can be performed remotely without authentication if the mod_rtmp listener is enabled and accessible.

Summary

FreeSWITCH versions before 1.11.2 contain an out-of-bounds read vulnerability in the mod_rtmp module. Specifically, rtmp_i_connect() does not check if the first RTMP connect argument is an AMF object before passing it to amf0_object_get(). If a string or number is provided instead, the function interprets union bytes as node pointers and dereferences them, causing an invalid read. This can be triggered by any client with network access to an enabled mod_rtmp listener by sending a malformed connect command prior to login. The invalid read reliably crashes the FreeSWITCH process, ending all active calls. The module is disabled by default in stock builds and configurations. No evidence of memory write, information disclosure, or code execution exploitation exists. The vulnerability is resolved in version 1.11.2.

CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-843Access of Resource Using Incompatible Type (Type Confusion) (opens in a new tab)
Base weakness
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2026, 20:05 UTC

WeaknessesCWE-125, CWE-843

Technical details

References

Community reviews

Related threats