CVE-2026-52846
Fixed in a distro release EPSS <1%CVSS 4.2
Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving dangerous content in the output if it is later rendered as HTML. This may allow client-side XSS in cases where untrusted strings are rendered unsafely. This vulnerability is fixed in 2.11.4.
Products: caddyserver caddy
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/caddyserver/caddy | no fix |
| Go | github.com/caddyserver/caddy/v2 | 2.11.4 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian:12 | caddy | 2.6.2-5+deb12u1 |
| Debian:13 | caddy | 2.6.2-12+deb13u1 |
| Debian:14 | caddy | 2.11.4-1 |
| SUSE:Linux Enterprise Server 16.0 | govulncheck-vulndb | 0.0.20260727T201416-160000.1.1 |
| SUSE:Linux Enterprise Server for SAP applications 16.0 | govulncheck-vulndb | 0.0.20260727T201416-160000.1.1 |
| Ubuntu:25.10 | caddy | no fix |
| Ubuntu:26.10 | caddy | no fix |
| Ubuntu:Pro:24.04:LTS | caddy | no fix |
| Ubuntu:Pro:26.04:LTS | caddy | no fix |
| openSUSE:Leap 16.0 | govulncheck-vulndb | 0.0.20260727T201416-160000.1.1 |