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CVE-2026-25681 is a cross-site scripting vulnerability in golang.org/x/net/html. The HTML parser incorrectly handles character references in DOCTYPE nodes. Parsing attacker-controlled HTML and subsequently rendering it can produce an unexpected HTML tree, allowing input that was believed to have been sanitized to be interpreted differently by a browser. Applications that parse, sanitize, and render untrusted HTML using the affected component may therefore be susceptible to XSS.
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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.
33 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in golang.org/x/net/html described as allowing arbitrary code execution through cross-site scripting. It affects the osbuild-composer packages installed on the referenced Red Hat Enterprise Linux 9 host.
An arbitrary-code-execution issue through cross-site scripting in golang.org/x/net/html. It affects the osbuild-composer packages covered by Red Hat advisory RHSA-2026:59560.
An arbitrary-code-execution vulnerability in golang.org/x/net/html via cross-site scripting.
A vulnerability in golang.org/x/net/html described as allowing arbitrary code execution through cross-site scripting. 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.