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CVE-2026-45771

Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion

Published: Jun 9, 2026Updated: Jun 10, 2026 Sources: CVE List NVDCWE-776
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 74.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 1.11.0, FreeSWITCH's bundled XML parser expands nested <!ENTITY> declarations without a depth or count bound, so a small DTD can describe a body that expands exponentially ("billion laughs"). The PIDF body of a SIP PUBLISH is fed to this parser before any digest check, letting an unauthenticated network attacker force unbounded CPU and memory consumption with a single request. This issue has been patched in version 1.11.0.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-776

Affected Products

freeswitchfreeswitch
On-prem
Communications / voip-telephony
freeswitchsignalwire
Mixed
Communications / voip-telephony
freeswitchoss-projectCommunications
signalwirecommercialCommunicationsaka freeswitch (related), sofia-sip (related)

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/signalwire/freeswitch/releases/tag/v1.11.0
github.com
https://github.com/signalwire/freeswitch/security/advisories/GHSA-5vjg-pv56-vg4c
github.com

Timeline

Published
Jun 9, 2026
Last Updated
Jun 10, 2026

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