CVE-2026-52796

Ein Angreifer kann mehrere Schwachstellen in Gogs ausnutzen, um erweiterte Berechtigungen zu erlangen, beliebigen Code auszuführen – sogar mit erweiterten Berechtigungen, was zur vollständigen Kontrolle über das System führen kann –, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, Cross-Site-Scripting-Angriffe durchzuführen, Benutzer auf bösartige Websites umzuleiten oder einen Denial-of-Service-Zustand zu verursachen.

### Summary Special template of issue index pattern may cause panic. ### Details in internal/markup/markup.go ```go link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m) ``` Issue index pattern is rendered to link with `com.Expand`. However, `com.Expand` is not safe. ```go i = strings.Index(template, "}") if s, ok := match[template[:i]]; ok { ``` when `{` is found but `}` not found, i comes to 1, template[:-1] will be called, and then panicked  finally, all pages than contains issue index are unavailable. ### PoC 1. set issue index pattern as follow  2. add a commit which point to an issue in its msg  using `#1` above ### Impact DoS that cause part of pages of the specify repo unavailable.

Gogs has DoS in rendering issue index pattern in gogs.io/gogs. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: gogs.io/gogs before v0.14.3.