Quick answers
- Is CVE-2026-93640 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93640 being exploited in the wild.
- How severe is CVE-2026-93640?
- High severity, with a CVSS score of 7.8, published 23 October 2026.
- Which products and versions are affected?
- Zimbra Collaboration Suite 10.1.16, 10.1.21.
- Is there a fix for CVE-2026-93640?
- 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-2026-93640 attacked?
- It is attacked with local access, in a hosted service.
- Am I affected by CVE-2026-93640?
- Check whether you run Zimbra Collaboration Suite 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 a passwordless sudo policy for the zmunbound wrapper, which forwards arbitrary arguments to Unbound without restricting the configuration path. An attacker can supply a malicious configuration that retains root privileges, disables chroot, and uses include directives to expose root-readable files through parser errors, or specifies an attacker-controlled logfile path to create or corrupt files with root ownership.
Affected products
- Zimbra Collaboration Suite 10.1.16, 10.1.21
Timeline
- 2026-10-23: disclosed