CVE-2026-56858: medium-severity vulnerability in Go standard library html/template
Fix Javascript regexp context tracking in html/template
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.3%
Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Go standard library · html/templateRelated CVEs — Go standard library html/template
In the same product, most dangerous first.
CVE-2023-24538CRITICALBackticks not treated as string delimiters in html/templateEPSS 2.3%CVE-2023-24540CRITICALImproper handling of JavaScript whitespace in html/templateEPSS 1.6%CVE-2023-24539HIGHImproper sanitization of CSS values in html/templateEPSS 1.0%CVE-2023-29400HIGHImproper handling of empty HTML attributes in html/templateEPSS 1.0%CVE-2023-39318—Improper handling of HTML-like comments in script contexts in html/templateEPSS 0.9%CVE-2023-39319—Improper handling of special tags within script contexts in html/templateEPSS 0.9%