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CVE-2026-27142 is a cross-site scripting vulnerability in Go's html/template escaping logic. URLs inserted by template actions into an HTML meta element's content attribute were not escaped. When the meta element also specifies http-equiv="refresh", attacker-controlled URL content can break the intended attribute context and execute script in the rendered page. Go introduced URL escaping for action output following "url=" in meta content attributes; the behavior can be disabled through the htmlmetacontenturlescape GODEBUG setting.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
46 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.