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Vulnerability Details :

CVE-2026-49840

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-09 Jun, 2026 | 16:00
Updated At-09 Jun, 2026 | 17:00
Rejected At-
Credits

FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:09 Jun, 2026 | 16:00
Updated At:09 Jun, 2026 | 17:00
Rejected At:
â–¼CVE Numbering Authority (CNA)
FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing

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.

Affected Products
Vendor
signalwire
Product
freeswitch
Versions
Affected
  • < 1.11.1
Problem Types
TypeCWE IDDescription
CWECWE-20CWE-20: Improper Input Validation
CWECWE-122CWE-122: Heap-based Buffer Overflow
CWECWE-195CWE-195: Signed to Unsigned Conversion Error
CWECWE-787CWE-787: Out-of-bounds Write
Type: CWE
CWE ID: CWE-20
Description: CWE-20: Improper Input Validation
Type: CWE
CWE ID: CWE-122
Description: CWE-122: Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-195
Description: CWE-195: Signed to Unsigned Conversion Error
Type: CWE
CWE ID: CWE-787
Description: CWE-787: Out-of-bounds Write
Metrics
VersionBase scoreBase severityVector
3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9
x_refsource_CONFIRM
https://github.com/signalwire/freeswitch/releases/tag/v1.11.1
x_refsource_MISC
Hyperlink: https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/signalwire/freeswitch/releases/tag/v1.11.1
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:09 Jun, 2026 | 17:17
Updated At:10 Jun, 2026 | 15:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CPE Matches

freeswitch
freeswitch
>>freeswitch>>Versions before 1.11.1(exclusive)
cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-20Primarysecurity-advisories@github.com
CWE-122Primarysecurity-advisories@github.com
CWE-195Primarysecurity-advisories@github.com
CWE-787Primarysecurity-advisories@github.com
CWE ID: CWE-20
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-122
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-195
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-787
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/signalwire/freeswitch/releases/tag/v1.11.1security-advisories@github.com
Release Notes
https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9security-advisories@github.com
Third Party Advisory
Hyperlink: https://github.com/signalwire/freeswitch/releases/tag/v1.11.1
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9
Source: security-advisories@github.com
Resource:
Third Party Advisory

Change History

0
Information is not available yet

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