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CVE-2026-56858 is a cross-site scripting vulnerability in Go's html/template package. Incorrect JavaScript regular-expression context tracking permits pathological input to prematurely terminate an unescaped forward slash interpreted as part of a JavaScript regexp literal. This can cause subsequently rendered attacker-controlled data to be treated as executable or otherwise arbitrary page content rather than being safely escaped.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability requiring user interaction, addressed by Miracle Linux AXSA-2026-1689 for Go-related packages on Miracle Linux 9. The supplied CVSS v3 vector indicates low confidentiality and integrity impact with scope changed.
A network-accessible vulnerability requiring user interaction, addressed by AlmaLinux ALSA-2026:60306 for Go/Golang packages. The provided CVSS v3 vector indicates low confidentiality and integrity impact with scope changed.
A remotely reachable, low-complexity vulnerability requiring user interaction, with low confidentiality and integrity impact and a changed scope, addressed by the AlmaLinux ALSA-2026-60305 update.
A vulnerability addressed by Alma Linux ALSA-2026:60304 affecting Golang-related packages on AlmaLinux 9. The supplied CVSS v3 vector indicates network attackability, low attack complexity, no privileges required, and required user interaction.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.