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Findings

CVE-2026-56858

Fix Javascript regexp context tracking in html/template

Published Aug 13, 2026 · updated Oct 10, 2026

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 13, 2026 · Catalog

    Detected

    Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

  2. Oct 10, 2026 · Catalog

    Fix available

    Go stdlib 0 → 1.25.13

  3. Oct 10, 2026 · Catalog

    Updated

    Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

Affected

  • Go stdlib0 → 1.25.13

Sources

References