CVE-2026-93962Public exploitNetwork attack vectorHinoki check available

Pre-authentication service crash via undersized Diameter header

Published Sep 20, 2026 · Updated Sep 20, 2026

Heap-based buffer overflow in the CDP receiver in affected Kamailio releases allows remote attackers to crash CDP-enabled nodes. receiver.c trusts a Diameter header length below 20, allocates that many shared-memory bytes, then copies the complete 20-byte header into the smaller buffer. Any TCP peer that can reach an enabled Diameter interface can trigger the overwrite before capabilities exchange or application authentication; the demonstrated consequence is process abort and node shutdown.

CVSS severity8.3
High
EPSS probability0.69%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap-based buffer overflow in the CDP receiver in affected Kamailio releases allows remote attackers to crash CDP-enabled nodes. receiver.c trusts a Diameter header length below 20, allocates that many shared-memory bytes, then copies the complete 20-byte header into the smaller buffer. Any TCP peer that can reach an enabled Diameter interface can trigger the overwrite before capabilities exchange or application authentication; the demonstrated consequence is process abort and node shutdown.

The record

CVE
CVE-2026-93962
Published
Sep 20, 2026
Updated
Sep 20, 2026
Vendor
Kamailio
Product
Kamailio
Classifications
CWE-122, CWE-119, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8.0
  2. Affected versionversion=5.8.1
  3. Affected versionversion=5.8.2
  4. Affected versionversion=5.8.3
  5. Affected versionversion=5.8.4
  6. Affected versionversion=5.8.5
  7. Affected versionversion=5.8.6
  8. Affected versionversion=5.8.7
  9. Affected versionversion=5.8.8
  10. Affected versionversion=6.0.0
  11. Affected versionversion=6.0.1
  12. Affected versionversion=6.0.2
  13. Affected versionversion=6.0.3
  14. Affected versionversion=6.0.4
  15. Affected versionversion=6.0.5
  16. Affected versionversion=6.0.6
  17. Affected versionversion=6.0.7
  18. Affected versionversion=6.1.0
  19. Affected versionversion=6.1.1
  20. Affected versionversion=6.1.2
  21. Affected versionversion=6.1.3
  22. Affected versionversion=6.1.4
  23. Affected versionversion=6.2.0-dev1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kamailio · Kamailioversion=5.8.0; version=5.8.1; version=5.8.2; version=5.8.3; version=5.8.4; version=5.8.5; version=5.8.6; version=5.8.7; version=5.8.8; version=6.0.0; version=6.0.1; version=6.0.2; version=6.0.3; version=6.0.4; version=6.0.5; version=6.0.6; version=6.0.7; version=6.1.0; version=6.1.1; version=6.1.2; version=6.1.3; version=6.1.4; version=6.2.0-dev1

Published CVSS scores

7.5VulDB CNAAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
8.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

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