# CVE-2026-77703: HAVELSAN Liman Render Engine key exchange without entity authentication

Source: https://junglewise.ai/threats/cve-2026-77703-key-exchange-without-entity-authentication-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77703 · Severity: medium · CVSS 5.9 · Published 2026-09-24

HAVELSAN's Liman Render Engine is a rendering component used in security-critical applications. A flaw in its key exchange mechanism allows an attacker positioned between two communicating parties to intercept and manipulate encrypted communications, potentially leading to data exposure or session hijacking.

Technologies: [HAVELSAN Liman Render Engine](https://junglewise.ai/threats/technologies/liman-render-engine). Vendors: [HAVELSAN](https://junglewise.ai/threats/vendors/havelsan).

## Quick answers

**Is CVE-2026-77703 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77703 being exploited in the wild.

**How severe is CVE-2026-77703?** Medium severity, with a CVSS score of 5.9, published 24 September 2026.

**Which products and versions are affected?** HAVELSAN Liman Render Engine 1.0 before 1.2-75.

**Is there a fix for CVE-2026-77703?** 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-2026-77703 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-77703?** Check whether you run HAVELSAN Liman Render Engine 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

The vulnerability exists in Liman Render Engine's key exchange implementation, which fails to authenticate one or both communicating entities before establishing an encrypted channel. This permits an adversary-in-the-middle (AiTM) attack over a network to intercept, read, and potentially modify encrypted data. The flaw affects versions 1.0 through 1.2-74, with a fix available in version 1.2-75 and later.

## Affected products

- HAVELSAN Liman Render Engine 1.0 before 1.2-75

## Timeline

- 2026-09-24: disclosed

## References

- [https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-1172](https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-1172)

## Related threats

- [HAVELSAN Liman Render Engine privilege escalation via permission assignment](https://junglewise.ai/threats/cve-2026-119474-incorrect-permission-assignment-for-critical-resource)
- [HAVELSAN Liman Render Engine improper certificate validation](https://junglewise.ai/threats/cve-2026-77707-improper-certificate-validation-vulnerability-in-havelsan-inc)