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 :=…

在 GitHub Advisory Database 阅读

2026/10/17 00:41，GitHub Advisory Database 发布了“gomarkdown/markdown IsSafeURL panics on short URLs”（类型：漏洞公告）。严重程度为“高危”（high）。相关技术：Go、GitHub。CVE：CVE-2026-102941。