# CVE-2026-93962: Kamailio heap buffer overflow in CDP Diameter Receiver

Source: https://junglewise.ai/threats/cve-2026-93962-a-weakness-has-been-identified-in-kamailio-up-to-5-8-8-6-0-7-6-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-20. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93962 · Severity: high · CVSS 8.3 · Published 2026-09-20

Kamailio, an open-source SIP server used for VoIP platforms, contains a heap-based buffer overflow in its Diameter protocol handler. A remote attacker can send a malformed Diameter message to trigger the overflow, potentially leading to code execution or service disruption. The vulnerability affects multiple recent versions and a patch is available.

Technologies: [Kamailio](https://junglewise.ai/threats/technologies/kamailio). Vendors: [Kamailio](https://junglewise.ai/threats/vendors/kamailio).

## Quick answers

**Is CVE-2026-93962 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93962 being exploited in the wild.

**How severe is CVE-2026-93962?** High severity, with a CVSS score of 8.3, published 20 September 2026.

**Which products and versions are affected?** Kamailio up to 5.8.8, 6.0.x before 6.0.8, 6.1.x before 6.1.5, 6.2.0-dev1.

**Is there a fix for CVE-2026-93962?** A patch was published on 2026-09-20: Fix available in commits 38711a3e788de0130d48cb485578c482b57d9351 and related patches; upgrade to 6.0.8 or later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-93962 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-93962?** Check whether you run Kamailio at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in the shm_malloc function within src/modules/cdp/receiver.c of the CDP Diameter Receiver component. The vulnerability occurs when processing undersized Diameter messages: the code copies a 20-byte header without validating that the declared message length matches the allocated buffer size, allowing heap corruption. The attack is remotely triggerable over the network and does not require authentication.

## Affected products

- Kamailio Kamailio up to 5.8.8, 6.0.x before 6.0.8, 6.1.x before 6.1.5, 6.2.0-dev1

## Timeline

- 2026-09-20: disclosed: Vulnerability disclosed and exploit made public
- 2026-09-20: patched: Fix available in commits 38711a3e788de0130d48cb485578c482b57d9351 and related patches; upgrade to 6.0.8 or later

## References

- [https://github.com/kamailio/kamailio/](https://github.com/kamailio/kamailio/)
- [https://github.com/kamailio/kamailio/commit/38711a3e788de0130d48cb485578c482b57d9351](https://github.com/kamailio/kamailio/commit/38711a3e788de0130d48cb485578c482b57d9351)

## Related threats

- [Kamailio stack buffer overflow in ims_qos_npn module](https://junglewise.ai/threats/cve-2026-106804-a-stack-based-buffer-overflow-exists-in-kamailio-v6-1-3-and-v6-1)
- [Kamailio stack buffer overflow in ims_registrar_pcscf module](https://junglewise.ai/threats/cve-2026-106803-a-stack-based-buffer-overflow-exists-in-kamailio-v6-1-3-and-v6-1)
- [Kamailio sipt module buffer overflow in ISUP parser](https://junglewise.ai/threats/cve-2026-108822-a-vulnerability-was-detected-in-kamailio-up-to-6-0-7-6-1-3-the)
- [Kamailio ims_registrar_pcscf double free in security agreement parsing](https://junglewise.ai/threats/cve-2026-52023-kamailio-ims-registrar-pcscf-double-free-in-security-agreement)
- [Kamailio IMS P-CSCF denial of service in REGISTER handling](https://junglewise.ai/threats/cve-2026-52022-kamailio-ims-p-cscf-denial-of-service-in-register-handling)