Header Injection Affecting github.com/caddyserver/caddy/v2/modules/caddyhttp package, versions >=2.7.5 <2.11.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCADDYSERVERCADDYV2MODULESCADDYHTTP-15440557
- published10 Mar 2026
- disclosed6 Mar 2026
- creditSam.An
Introduced: 6 Mar 2026
CVE-2026-30852 (opens in a new tab)How to fix?
Upgrade github.com/caddyserver/caddy/v2/modules/caddyhttp to version 2.11.2 or higher.
Overview
Affected versions of this package are vulnerable to Header Injection in the vars_regexp matcher. An attacker can access sensitive environment variables, file contents, or system information by injecting specially crafted placeholders such as {env.*} or {file.*} into HTTP request headers, which are then expanded and leaked in server responses.