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CVE-2026-27136 is a cross-site scripting vulnerability in the Go x/net HTML package. Parsing attacker-controlled HTML and subsequently serializing it with Render can produce an unexpected HTML tree, including through duplicate-attribute handling. Applications that sanitize the parsed HTML before rendering may therefore emit HTML whose interpreted structure bypasses their sanitization controls, allowing attacker-controlled script to execute in a victim's browser.
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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.
55 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability included in the Alibaba Cloud Linux 3 osbuild-composer security check. Its supplied CVSS v2 vector indicates network accessibility, low attack complexity, no authentication requirement, and complete confidentiality and integrity impacts.
A vulnerability in golang.org/x/net allows HTML parsing followed by rendering to produce an unexpected HTML tree, potentially enabling cross-site scripting in applications that sanitize HTML before rendering. The advisory lists a CVSS v3 base score of 6.1 and recommends upgrading to version 0.55.0 or later.
An HTML parsing bypass vulnerability in golang.org/x/net/html that enables cross-site scripting. The advisory identifies affected osbuild-composer packages on MiracleLinux 9. Nessus detects affected package versions rather than testing exploitation.
An HTML parsing and rendering vulnerability that can produce an unexpected HTML tree, enabling cross-site scripting in applications that sanitize HTML before rendering it. The advisory identifies affected grafana and grafana-selinux packages on AlmaLinux 9.6 and directs administrators to install security updates. Nessus relies on self-reported versions rather than testing the flaw.
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.