CVE catalog

CVE-2026-52846

Severity: Medium · CVSS 4.2CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Published: Jun 23, 2026, 5:47:30 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.25% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	caddy	sid	`2.11.4-1`	fixed
Debian	caddy	forky	`2.11.4-1`	fixed
Debian	caddy	trixie	`2.6.2-12+deb13u1`	fixed
Debian	caddy	trixie-security	`2.6.2-12+deb13u1`	fixed
Debian	caddy	bookworm	`2.6.2-5`	vulnerable
Debian	caddy	bookworm-security	`2.6.2-5+deb12u1`	fixed
Cpe	caddy	Not reported	Not reported	vulnerable
Cpe	caddy	Not reported	`2.11.4`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	caddy	source	sid	`2.11.4-1`	not yet assigned	Not reported	[1140773]
Debian	caddy	source	forky	`2.11.4-1`	not yet assigned	Not reported	[1140773]
Debian	caddy	source	trixie	`2.6.2-12+deb13u1`	not yet assigned	Not reported	[1140773]
Debian	caddy	source	bookworm	`2.6.2-5+deb12u1`	not yet assigned	Not reported	[1140773]
Cpe	caddy	cpe	Not reported	`2.11.4`	Not reported	Not reported	Not reported

[Debian bug #1140773]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[caddy]Affected
Details (2)
- 2.6.2-5 · amd64 · bookworm
  Affected · Fixed: 2.6.2-5+deb12u1
  nvd · caddy · debian · bookworm; nvd · caddy · debian · 12
- 2.6.2-5 · arm64 · bookworm
  Affected · Fixed: 2.6.2-5+deb12u1
  nvd · caddy · debian · bookworm; nvd · caddy · debian · 12

[Debian 13 (Trixie)]

[caddy]Affected
Details (5)
- 2.6.2-12+b3 · amd64 · trixie
  Affected · Fixed: 2.6.2-12+deb13u1
  nvd · caddy · debian · 13
- 2.6.2-12+b3 · arm64 · trixie
  Affected · Fixed: 2.6.2-12+deb13u1
  nvd · caddy · debian · 13
- 2.11.2-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 2.6.2-12+deb13u1
  nvd · caddy · debian · 13
- 2.6.2-12+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 2.6.2-12+deb13u1
  nvd · caddy · debian · 13
- 2.6.2-12+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 2.6.2-12+deb13u1
  nvd · caddy · debian · 13

Observed: Oct 27, 2026, 7:14:04 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]