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CVE-2026-42502 is a cross-site scripting vulnerability in golang.org/x/net/html. Parsing attacker-controlled HTML and subsequently rendering it with Render can produce an HTML tree that differs unexpectedly from the sanitized representation. Applications that sanitize untrusted HTML before rendering may therefore render attacker-controlled active content.
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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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A moderate-severity vulnerability tracked as CVE-2026-42502, addressed by an AlmaLinux 9.6 TuxCare local security-check advisory.
A moderate-severity vulnerability tracked as CVE-2026-42502, addressed by a Rocky Linux security update. The supplied CVSS v3 vector indicates network-reachable exploitation with low complexity, no privileges required, and user interaction required, resulting in low confidentiality and integrity impact.
A cross-site scripting vulnerability in golang.org/x/net/html involving unexpected HTML tree rendering.
A cross-site scripting vulnerability in golang.org/x/net/html caused by unexpected HTML tree rendering, affecting installed osbuild-composer packages on RHEL 9.
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.