# CVE-2026-86109: Arista VeloCloud Edge signature verification bypass in software update

Source: https://junglewise.ai/threats/cve-2026-86109-arista-velocloud-edge-signature-verification-bypass-in-software  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-16. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-86109 · Severity: medium · CVSS 6.6 · Published 2026-09-16

VeloCloud Edge is network edge software used to manage and secure branch office connectivity to cloud applications and corporate networks. A vulnerability in its software update workflow allows attackers with administrator privileges or direct Edge access to bypass signature validation and install unauthorized software, potentially compromising network security and enabling malware deployment.

Technologies: [Arista Velocloud Edge](https://junglewise.ai/threats/technologies/velocloud-edge). Vendors: [Arista](https://junglewise.ai/threats/vendors/arista).

## Quick answers

**Is CVE-2026-86109 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86109 being exploited in the wild.

**How severe is CVE-2026-86109?** Medium severity, with a CVSS score of 6.6, published 16 September 2026.

**Which products and versions are affected?** Arista Velocloud Edge 6.4.1.x and below in 6.4.x train; 6.1.4.x and below in 6.1.x train; 5.2.6.x and below in 5.2.x train; all prior releases.

**Is there a fix for CVE-2026-86109?** 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-2026-86109 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-86109?** Check whether you run Arista Velocloud Edge 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 VeloCloud Edge software update workflow fails to properly validate cryptographic signatures on update bundles because it does not restrict the digest algorithm used for artifact verification (CWE-347: Improper Verification of Cryptographic Signature). An attacker requires either high-privilege access to VeloCloud Orchestrator to upload malicious packages, or direct credentials to access an Edge device. The attack vector is network-based but requires high privileges (PR:H) and high complexity (AC:H). Successful exploitation allows installation of arbitrary software on Edge devices, compromising confidentiality, integrity, and availability. Patches are available in VeloCloud Edge 5.2.7.0+, 6.1.5.0+, 6.4.2+, and 7.0.0+. No hotfix is available for older versions.

## Affected products

- Arista VeloCloud Edge 6.4.1.x and below in 6.4.x train; 6.1.4.x and below in 6.1.x train; 5.2.6.x and below in 5.2.x train; all prior releases

## Timeline

- 2026-09-09: disclosed: Arista Security Advisory 0182 initial release
- 2026-09-22: advisory: CSAF JSON file added to advisory

## References

- [https://www.arista.com/zh/support/advisories-notices/security-advisory/24738-security-advisory-0182](https://www.arista.com/zh/support/advisories-notices/security-advisory/24738-security-advisory-0182)

## Related threats

- [Arista VeloCloud Edge and Gateway out-of-bounds write in VCMP tunnel](https://junglewise.ai/threats/cve-2026-86107-arista-velocloud-edge-and-gateway-out-of-bounds-write-in-vcmp)
- [Arista VeloCloud Edge HA authentication bypass](https://junglewise.ai/threats/cve-2026-86106-arista-velocloud-edge-ha-authentication-bypass)
- [Arista VeloCloud Edge OS command injection in management workflows](https://junglewise.ai/threats/cve-2026-86108-arista-velocloud-edge-os-command-injection-in-management)