# CVE-2026-52846: caddy: Caddy is an extensible server platform that uses TLS by default

CVE-2026-52846 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-52846, released June 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-52846
- Priority: Routine
- CVSS: 4.2 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 23, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | caddy Debian 12.15 (bookworm) | 2.6.2-5+deb12u1 | [DEBIAN-CVE-2026-52846](https://patchblox.com/security/data/fix/linux/debian-cve-2026-52846.md) | Jun 23, 2026 |
| Linux | caddy Debian 13.5 (trixie) | 2.6.2-12+deb13u1 | [DEBIAN-CVE-2026-52846](https://patchblox.com/security/data/fix/linux/debian-cve-2026-52846.md) | Jun 23, 2026 |
| Linux | caddy Debian 14 | 2.11.4-1 | [DEBIAN-CVE-2026-52846](https://patchblox.com/security/data/fix/linux/debian-cve-2026-52846.md) | Jun 23, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260727T201416-160000.1.1 | [OPENSUSE-SU-2026:21551-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21551-1.md) | Aug 10, 2026 |
| Linux | govulncheck-vulndb sles 16.0 | 0.0.20260727T201416-160000.1.1 | [SUSE-SU-2026:23227-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23227-1.md) | Aug 10, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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