# github.com/caddyserver/caddy/v2 (Go) vulnerabilities Source: https://junglewise.ai/threats/technologies/github-com-caddyserver-caddy-v2 Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/github-com-caddyserver-caddy-v2.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 21 vulnerabilities in github.com/caddyserver/caddy/v2 (Go): 0 in the last 7 days and 2 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-55458, was published on 5 November 2026. 1 vulnerability in the last four weeks, level on the four before (1). ## Counts - Last 7 days: 0 - Last 30 days: 1 - Last 90 days: 2 - All time: 21 (0 critical, 0 exploited in the wild) ## About github.com/caddyserver/caddy/v2 (Go) An extensible, open-source web server written in Go with automatic HTTPS support. ## Latest github.com/caddyserver/caddy/v2 (Go) vulnerabilities - [CVE-2026-55458: Caddy has an RFC 7230 §6.1 compliance issue / Hop-by-hop headers that leak through](https://junglewise.ai/threats/cve-2026-55458-caddy-has-an-rfc-7230-6-1-compliance-issue-hop-by-hop-headers) (medium, CVSS 4, published 5 Nov 2026) - [CVE-2026-77281: Caddy placeholder re-expansion in URI rewrite](https://junglewise.ai/threats/cve-2026-77281-caddy-placeholder-re-expansion-in-uri-rewrite) (medium, CVSS 6.5, published 17 Sep 2026) - [GO-2026-5730 - Caddy Fix Bypass in github.com/caddyserver/caddy](https://junglewise.ai/threats/go-2026-5730-caddy-fix-bypass-in-github-com-caddyserver-caddy-baf17ba5) (info, published 24 Jul 2026) - [GO-2026-5408 - Caddy: Remote Admin Authorization Bypass on PKI Endpoints via Prefix-Based Path Matching in…](https://junglewise.ai/threats/go-2026-5408-caddy-remote-admin-authorization-bypass-on-pki-endpoints-4c5e1b8e) (info, published 24 Jul 2026) - [CVE-2026-52846: Caddyserver Caddy XSS bypass in stripHTML template function](https://junglewise.ai/threats/cve-2026-52846-caddyserver-caddy-xss-bypass-in-striphtml-template-function) (medium, CVSS 4.2, published 23 Jun 2026) - [CVE-2026-52845: Caddy authentication bypass via FastCGI header normalization collision](https://junglewise.ai/threats/cve-2026-52845-caddy-authentication-bypass-via-fastcgi-header-normalization) (high, CVSS 8.1, published 23 Jun 2026) - [CVE-2026-52844: Caddy path authorization bypass on Windows via encoded backslash](https://junglewise.ai/threats/cve-2026-52844-caddy-path-authorization-bypass-on-windows-via-encoded-backslash) (high, CVSS 7.5, published 23 Jun 2026) - [CVE-2026-45692: Caddyserver Caddy authorization bypass in /config API via array index normalization](https://junglewise.ai/threats/cve-2026-45692-caddyserver-caddy-authorization-bypass-in-config-api-via-array) (medium, CVSS 5.4, published 23 Jun 2026) - [CVE-2026-45135: Caddyserver Caddy Remote Code Execution in FastCGI splitPos](https://junglewise.ai/threats/cve-2026-45135-caddyserver-caddy-remote-code-execution-in-fastcgi-splitpos) (high, CVSS 8.1, published 23 Jun 2026) - [Caddy auth bypass in PKI remote admin endpoints](https://junglewise.ai/threats/caddy-auth-bypass-in-pki-remote-admin-endpoints-7ca83725) (medium, CVSS 4.3, published 19 May 2026) - [Caddyserver Caddy expression language injection in vars_regexp](https://junglewise.ai/threats/caddyserver-caddy-expression-language-injection-in-vars-regexp-c26de985) (medium, CVSS 5.5, published 19 May 2026) - [CVE-2026-30851: GO-2026-4639 - Caddy forward_auth copy_headers allows Identity Injection and Privilege Escalation in…](https://junglewise.ai/threats/cve-2026-30851-caddy-forward-auth-copy-headers-does-not-strip-client-supplied) (low, CVSS 3.1, published 10 Mar 2026) - [CVE-2026-30852: GO-2026-4644 - Caddy's vars_regexp double-expands user input, leaking env vars and files in github.com/caddyserver/caddy](https://junglewise.ai/threats/cve-2026-30852-caddy-s-vars-regexp-double-expands-user-input-leaking-env-vars) (medium, CVSS 4, published 10 Mar 2026) - [CVE-2026-27586: GO-2026-4539 - Caddy mTLS authentication fails open in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27586-caddy-mtls-client-authentication-silently-fails-open-when-ca) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27589: Caddy is vulnerable to cross-origin config application via local admin API /load](https://junglewise.ai/threats/cve-2026-27589-caddy-is-vulnerable-to-cross-origin-config-application-via-local) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27587: GO-2026-4538 - Caddy MatchPath %xx branch skips case normalization in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27587-caddy-matchpath-xx-escaped-path-branch-skips-case-normalization) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27588: GO-2026-4541 - Caddy MatchHost becomes case-sensitive in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27588-caddy-matchhost-becomes-case-sensitive-for-large-host-lists-100) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27585: GO-2026-4535 - Improper sanitization of glob characters in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27585-caddy-improper-sanitization-of-glob-characters-in-file-matcher) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27590: GO-2026-4536 - Unicode case-folding causes incorrect split_path index in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27590-caddy-unicode-case-folding-length-expansion-causes-incorrect) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2022-28923: GO-2023-1567 - Open redirect in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2022-28923-open-redirect-in-caddy) (low, CVSS 3.1, published 16 Feb 2023) - [CVE-2022-29718: Open redirect in caddy](https://junglewise.ai/threats/cve-2022-29718-open-redirect-in-caddy) (low, CVSS 3.1, published 3 Jun 2022) ## Most severe github.com/caddyserver/caddy/v2 (Go) vulnerabilities - [CVE-2026-45135: Caddyserver Caddy Remote Code Execution in FastCGI splitPos](https://junglewise.ai/threats/cve-2026-45135-caddyserver-caddy-remote-code-execution-in-fastcgi-splitpos) (high, CVSS 8.1, published 23 Jun 2026) - [CVE-2026-52845: Caddy authentication bypass via FastCGI header normalization collision](https://junglewise.ai/threats/cve-2026-52845-caddy-authentication-bypass-via-fastcgi-header-normalization) (high, CVSS 8.1, published 23 Jun 2026) - [CVE-2026-52844: Caddy path authorization bypass on Windows via encoded backslash](https://junglewise.ai/threats/cve-2026-52844-caddy-path-authorization-bypass-on-windows-via-encoded-backslash) (high, CVSS 7.5, published 23 Jun 2026) - [CVE-2026-77281: Caddy placeholder re-expansion in URI rewrite](https://junglewise.ai/threats/cve-2026-77281-caddy-placeholder-re-expansion-in-uri-rewrite) (medium, CVSS 6.5, published 17 Sep 2026) - [Caddyserver Caddy expression language injection in vars_regexp](https://junglewise.ai/threats/caddyserver-caddy-expression-language-injection-in-vars-regexp-c26de985) (medium, CVSS 5.5, published 19 May 2026) - [CVE-2026-45692: Caddyserver Caddy authorization bypass in /config API via array index normalization](https://junglewise.ai/threats/cve-2026-45692-caddyserver-caddy-authorization-bypass-in-config-api-via-array) (medium, CVSS 5.4, published 23 Jun 2026) - [Caddy auth bypass in PKI remote admin endpoints](https://junglewise.ai/threats/caddy-auth-bypass-in-pki-remote-admin-endpoints-7ca83725) (medium, CVSS 4.3, published 19 May 2026) - [CVE-2026-52846: Caddyserver Caddy XSS bypass in stripHTML template function](https://junglewise.ai/threats/cve-2026-52846-caddyserver-caddy-xss-bypass-in-striphtml-template-function) (medium, CVSS 4.2, published 23 Jun 2026) - [CVE-2026-27590: GO-2026-4536 - Unicode case-folding causes incorrect split_path index in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27590-caddy-unicode-case-folding-length-expansion-causes-incorrect) (medium, CVSS 4, published 26 Feb 2026) - [CVE-2026-27588: GO-2026-4541 - Caddy MatchHost becomes case-sensitive in github.com/caddyserver/caddy/v2](https://junglewise.ai/threats/cve-2026-27588-caddy-matchhost-becomes-case-sensitive-for-large-host-lists-100) (medium, CVSS 4, published 26 Feb 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, level on the four before (1). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 1 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 1 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Go technologies - [github.com/mattermost/mattermost-server (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server): 297 vulnerabilities - [github.com/mattermost/mattermost-server/v6 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v6): 222 vulnerabilities - [github.com/mattermost/mattermost/server/v8 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v8): 207 vulnerabilities - [github.com/mattermost/mattermost-server/v5 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v5): 199 vulnerabilities - [stdlib (Go)](https://junglewise.ai/threats/technologies/go-stdlib): 178 vulnerabilities - [github.com/siyuan-note/siyuan/kernel (Go)](https://junglewise.ai/threats/technologies/github-com-siyuan-note-siyuan-kernel): 160 vulnerabilities - [code.gitea.io/gitea (Go)](https://junglewise.ai/threats/technologies/code-gitea-io-gitea): 126 vulnerabilities - [code.vikunja.io/api (Go)](https://junglewise.ai/threats/technologies/code-vikunja-io-api): 91 vulnerabilities - [gogs.io/gogs (Go)](https://junglewise.ai/threats/technologies/gogs-io-gogs): 81 vulnerabilities - [github.com/traefik/traefik/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v2): 78 vulnerabilities - [github.com/traefik/traefik (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik): 75 vulnerabilities - [github.com/usememos/memos (Go)](https://junglewise.ai/threats/technologies/github-com-usememos-memos): 75 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "github.com/caddyserver/caddy/v2 (Go) vulnerabilities", https://junglewise.ai/threats/technologies/github-com-caddyserver-caddy-v2, 13 November 2026.