CVE-2026-2808
MEDIUMCVE-2026-2808 is a medium-severity (CVSS 6.8) CWE-59 vulnerability in github.com/hashicorp/consul. O3 Security confirms whether CVE-2026-2808 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Consul vulnerable to arbitrary file reads through the vault kubernetes authentication provider
Real-World Exposure
github.com/hashicorp/consul🐹github.com/hashicorp/consul🐹github.com/hashicorp/consulReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
HashiCorp Consul and Consul Enterprise 1.18.20 up to 1.21.10 and 1.22.4 are vulnerable to arbitrary file read when configured with Kubernetes authentication. This vulnerability, CVE-2026-2808, is fixed in Consul 1.18.21, 1.21.11 and 1.22.5.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/hashicorp/consul | all versions | 1.18.21 |
| 🐹Go | github.com/hashicorp/consul | ≥ 1.22.0-rc1&&< 1.22.5 | 1.22.5 |
| 🐹Go | github.com/hashicorp/consul | ≥ 1.19.0&&< 1.21.11 | 1.21.11 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/hashicorp/consul. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/hashicorp/consul to 1.18.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-2808 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2026-2808 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2026-2808. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-2808 in your dependencies?
O3 detects CVE-2026-2808 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.