DEBIAN-CVE-2026-27588
Record from OSV · Published February 24, 2026
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` request matcher is documented as case-insensitive, but when configured with a large host list (>100 entries) it becomes case-sensitive due to an optimized matching path. An attacker can bypass host-based routing and any access controls attached to that route by changing the casing of the `Host` header. Version 2.11.1 contains a fix for the issue.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| caddy | Debian:13 | 2.6.2-12+deb13u1 |
| caddy | Debian:14 | 2.11.2-1 |
| caddy | Debian:12 | 2.6.2-5+deb12u1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:13 | caddy | 0, 2.6.2-12 |
| Debian:14 | caddy | 0, 2.11.2-1~bpo13+1, 2.6.2-12 |
| Debian:12 | caddy | 0, 2.6.2-5 |
Timeline
- Feb 24, 2026 CVE Published
- Oct 24, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
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vulnetix vdb fixes DEBIAN-CVE-2026-27588Or with curl, using the org id and key from your account page:
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