CVE-2026-52022Network attack vector

Remote service crash via double-free registration handling

Published Sep 1, 2026 · Updated Sep 2, 2026

Denial of service in Kamailio 6.1.1 and earlier allows remote attackers to crash an IMS P-CSCF through rapid registration traffic. The ims_usrloc_pcscf free_security() path frees shared IPsec security fields without verifying that the pointers remain allocated. Exploitation requires an IMS P-CSCF deployment and overlapping REGISTER, re-REGISTER, and de-REGISTER transactions for the same UE identity; a worker SIGSEGV terminates the service.

CVSS severity7.5
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Kamailio 6.1.1 and earlier allows remote attackers to crash an IMS P-CSCF through rapid registration traffic. The ims_usrloc_pcscf free_security() path frees shared IPsec security fields without verifying that the pointers remain allocated. Exploitation requires an IMS P-CSCF deployment and overlapping REGISTER, re-REGISTER, and de-REGISTER transactions for the same UE identity; a worker SIGSEGV terminates the service.

The record

CVE
CVE-2026-52022
Published
Sep 1, 2026
Updated
Sep 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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