CVE-2026-102941
HighCVSS 7.5Summary
In github.com/gomarkdown/markdown, parser.IsSafeURL slices url[:nPath] before the len(url) >= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) < nPath and cap(url) < nPath. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and via direct calls to parser.IsSafeURL. Fixed in 0.0.0-20260724235538-61af6e1e6971.
Risk Assessment
An uncaught panic can terminate the calling process, causing denial of service in applications rendering untrusted Markdown.
Recommendation
Update github.com/gomarkdown/markdown to version 0.0.0-20260724235538-61af6e1e6971 or later. Avoid rendering untrusted Markdown until the patch is applied.
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Original NVD description (English source)
The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Prior to 0.0.0-20260724235538-61af6e1e6971, parser.IsSafeURL in parser/parser.go slices url[:nPath] before the len(url) >= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) < nPath and cap(url) < nPath. The one-byte destination / is an explicit non-panic counterexample because it matches the first valid path and returns before a longer prefix is sliced. Demonstrated panic cases include empty, ., and .. destinations under those conditions. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and is also reachable by callers that pass a short attacker-controlled URL directly to the exported parser.IsSafeURL function. An uncaught panic can terminate the calling process and cause denial of service. This issue is fixed in 0.0.0-20260724235538-61af6e1e6971.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS