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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-102941)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-102941)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
476089	SCA: security update for github.com/gomarkdown/markdown (GHSA-cv23-7vc5-jfh7)	Tenable Cloud Security	SCA Checks	Local	high
476089	SCA: security update for github.com/gomarkdown/markdown (GHSA-cv23-7vc5-jfh7)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
366928	Linux Distros Unpatched Vulnerability : CVE-2026-102941	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-102941

high

Tenable Plugins

high

high

high