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CVE-2026-27136 is a cross-site scripting vulnerability in golang.org/x/net/html. The HTML parser improperly handles multiple duplicate attributes, causing certain malicious inputs to be parsed into an unexpected HTML tree. Applications that parse attacker-controlled HTML, sanitize the parsed result, and subsequently serialize it with Render can therefore produce active markup that bypasses the intended sanitization controls.
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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.
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.
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A cross-site-scripting vulnerability in golang.org/x/net/html that results from an HTML-parsing bypass. It affects the osbuild-composer packages installed on the referenced Red Hat Enterprise Linux 9 host.
A cross-site scripting vulnerability in golang.org/x/net/html caused by an HTML parsing bypass. It affects the osbuild-composer packages covered by Red Hat advisory RHSA-2026:59560.
A cross-site scripting vulnerability in golang.org/x/net/html that results from an HTML parsing bypass.
A cross-site scripting vulnerability in golang.org/x/net/html caused by an HTML parsing bypass. Red Hat addressed it through an Important osbuild-composer security update.
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.