# CVE-2026-102144: Kiteworks Email Protection Gateway resource exhaustion

Source: https://junglewise.ai/threats/cve-2026-102144-a-resource-exhaustion-vulnerability-in-kiteworks-email  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-102144 · Severity: medium · CVSS 5.3 · Published 2026-09-30

Kiteworks Email Protection Gateway is an email security appliance that protects organizations from email-based threats. An unauthenticated attacker can trigger expensive server operations repeatedly, causing the gateway to become partially unavailable and potentially disrupting email delivery for the organization.

Technologies: [Kiteworks Email Protection Gateway](https://junglewise.ai/threats/technologies/email-protection-gateway). Vendors: [Kiteworks](https://junglewise.ai/threats/vendors/kiteworks).

## Quick answers

**Is CVE-2026-102144 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102144 being exploited in the wild.

**How severe is CVE-2026-102144?** Medium severity, with a CVSS score of 5.3, published 30 September 2026.

**Which products and versions are affected?** Kiteworks Email Protection Gateway before 9.5.1.

**Is there a fix for CVE-2026-102144?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-102144 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-102144?** Check whether you run Kiteworks Email Protection Gateway 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

An uncontrolled resource consumption vulnerability allows unauthenticated remote attackers to repeatedly invoke a computationally expensive server-side operation without authentication, exhausting available resources and causing partial denial of service. The vulnerability affects Email Protection Gateway versions prior to 9.5.1 and requires only network access with no user interaction, making it easily exploitable.

## Affected products

- Kiteworks Email Protection Gateway before 9.5.1

## Timeline

- 2026-09-30: disclosed

## References

- [https://github.com/kiteworks/security-advisories/security/advisories/GHSA-wwhf-5862-rjxq](https://github.com/kiteworks/security-advisories/security/advisories/GHSA-wwhf-5862-rjxq)
- [https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json](https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json)

## Related threats

- [Kiteworks Email Protection Gateway improper access control on certificate assignment](https://junglewise.ai/threats/cve-2026-102149-kiteworks-email-protection-gateway-did-not-sufficiently-restrict)
- [Kiteworks Email Protection Gateway arbitrary file write via template injection](https://junglewise.ai/threats/cve-2026-102146-an-authenticated-email-protection-gateway-administrator-holding)
- [Kiteworks Email Protection Gateway unauthenticated file upload](https://junglewise.ai/threats/cve-2026-102143-an-unauthenticated-attacker-could-cause-a-file-with-attacker)
- [Kiteworks Email Protection Gateway authorization bypass in large file exchange](https://junglewise.ai/threats/cve-2026-102139-an-authorization-check-in-the-large-file-exchange-feature-of)
- [Kiteworks Email Protection Gateway deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-102135-on-a-kiteworks-email-protection-gateway-cluster-with-database)