gomarkdown/markdown IsSafeURL panics on short URLs

影響: go:github.com/gomarkdown/markdown < 0.0.0-20260724235538-61af6e1e6971 → 0.0.0-20260724235538-61af6e1e6971

IsSafeURL slices url[:nPath] before checking that len(url) >= nPath, so a URL shorter than a path prefix (0, 1 or 2 bytes) triggers a slice-bounds panic, and this is reached end to end when the html.Safelink hardening flag is enabled and the input contains an empty or very short link destination, giving an unrecoverable crash DoS. Confirmed at HEAD (e08cff8; present since 2022). The defect parser/parser.go, IsSafeURL: go func IsSafeURL(url []byte) bool { nLink := len(url) for _, path :=…

Read on GitHub Advisory Database

On 10/17/2026, 12:41 AM, GitHub Advisory Database published "gomarkdown/markdown IsSafeURL panics on short URLs" (type: Advisory). Severity is "High" (high). Related technologies: Go, GitHub. CVE: CVE-2026-102941.