Is CVE-2026-42502 in the CISA KEV catalog?

No. CVE-2026-42502 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42502?

CVE-2026-42502 has a CVSS v3 base score of 6.1 (Moderate).

What is the EPSS score for CVE-2026-42502?

CVE-2026-42502 has an EPSS score of 0.18% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42502?

Upgrade golang-golang-x-net on debian unstable to 1:0.55.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-42502

MEDIUM

6.1

CVSS v3

NVD

Description

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

CWE-1021

How to fix

Remediation Available

golang-golang-x-netDebian

Fixed in:1:0.55.0-1CVE-2026-42502

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.18%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Vendor Advisory1

pkg.go.dev

Issue Tracking2

Mailing List1

groups.google.com

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-29.