Vulnerability Intelligence Report
Fix Javascript regexp context tracking in html/template
CVE-2026-56858
Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.
No Active Exploit Signals
CVSS Base Score
6.1
MEDIUM
Exploitability:2.9
Impact Score:2.8
EPSS Probability:0.20%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-79 ↗CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Go standard library | html/template | 0 < 1.25.13 (affected), 1.26.0-0 < 1.26.6 (affected), 1.27.0-0 < 1.27.0-rc.3 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.199%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Go Project · Vendor · USA |
| Reserved | 2026-06-23T15:10:49 |
| Published | 2026-08-13T21:58:53 |
| Last Updated | 2026-08-14T15:32:29 |
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