Quick answers
- Is CVE-2026-57999 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-57999 being exploited in the wild.
- How severe is CVE-2026-57999?
- High severity, with a CVSS score of 8.8, published 29 June 2026.
- Which products and versions are affected?
- OpenWrt Luci-App-Tailscale-Community <= 0.11.1.
- Is there a fix for CVE-2026-57999?
- 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-2026-57999 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-57999?
- Check whether you run OpenWrt Luci-App-Tailscale-Community 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 command injection vulnerability exists in the `tailscale.do_login` RPC method of `luci-app-tailscale-community`. The root cause is improper neutralization of special elements within the `loginserver` and `loginserver_authkey` parameters. While individual values are passed through a quoting helper, the resulting string is embedded into an outer `/bin/sh -c` command using double quotes. This allows an authenticated attacker to use shell substitutions, such as `$()`, which are evaluated by the outer shell before the intended command execution. An attacker with LuCI/rpcd access can leverage this to achieve arbitrary code execution as the root user. As of the advisory date, no patched version has been identified in the source text.
Affected products
- OpenWrt luci-app-tailscale-community <= 0.11.1
Timeline
- 2026-06-11: advisory: Initial GHSA advisory published
- 2026-06-29: disclosed: NVD publication date