CVE-2026-42502

MEDIUM

6.1

CVSS v3

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

golang.org/x/netGo

Fixed in:0.55.0GO-2026-5027

grafanaRed Hat / RHEL

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafanaRocky

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-debuginfoRocky

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-debuginfoRed Hat / RHEL

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-debugsourceRed Hat / RHEL

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-debugsourceRocky

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-selinuxRocky

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

grafana-selinuxRed Hat / RHEL

Fixed in:0:10.2.6-26.el10_0RHSA-2026:67517

image-builderRed Hat / RHEL

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

image-builderRocky

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

image-builder-debuginfoRed Hat / RHEL

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

image-builder-debuginfoRocky

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

image-builder-debugsourceRocky

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

image-builder-debugsourceRed Hat / RHEL

Fixed in:0:52.1-2.el10_2RHSA-2026:67139

Fixed in:0:52.1-2.el9_8RHSA-2026:67138

osbuild-composerRed Hat / RHEL

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

osbuild-composerRocky

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

osbuild-composer-coreRocky

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

osbuild-composer-coreRed Hat / RHEL

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

osbuild-composer-core-debuginfoRocky

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

osbuild-composer-core-debuginfoRed Hat / RHEL

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

osbuild-composer-debuginfoRed Hat / RHEL

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:165.1-5.el9_8RHSA-2026:69293

Fixed in:0:76.1-8.el9_2RHSA-2026:61585

Fixed in:0:101.3-4.el9_4.5RHSA-2026:59562

Fixed in:0:76.1-8.el9_2RHSA-2026:61585

osbuild-composer-debuginfoRocky

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:165.1-5.el9_8RHSA-2026:69293

Fixed in:0:76.1-8.el9_2RHSA-2026:61585

Fixed in:0:165.1-5.el9_8RHSA-2026:69293

osbuild-composer-debugsourceRocky

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

osbuild-composer-debugsourceRed Hat / RHEL

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

osbuild-composer-dnf-jsonRocky

Fixed in:0:76.1-8.el9_2RHSA-2026:61585

osbuild-composer-dnf-jsonRed Hat / RHEL

Fixed in:0:76.1-8.el9_2RHSA-2026:61585

osbuild-composer-tests-debuginfoRocky

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

osbuild-composer-tests-debuginfoRed Hat / RHEL

Fixed in:0:134.1-10.el10_0RHSA-2026:63134

Fixed in:0:165.1-5.el10_2RHSA-2026:66432

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

0.22%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Vendor Advisory1

pkg.go.dev

Issue Tracking2

Mailing List1

groups.google.com

Related Vulnerabilities

Other CWE-1021 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-21132	Critical	9.6	23%	-	Fix
CVE-2011-1244	Medium	5.8	15%	-	-
CVE-2013-2682	Medium	4.3	6.3%	-	-
CVE-2021-21139	Medium	6.5	4.7%	-	Fix
CVE-2017-11290	Medium	6.1	3.0%	-	-
CVE-2008-2716	Medium	5.0	3.0%	-	Fix

Common questions

How do I fix CVE-2026-42502?

Published advisories record a fix for 34 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-42502 being actively exploited?

Not that we know of. CVE-2026-42502 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 12% of all scored CVEs.

How severe is CVE-2026-42502?

CVE-2026-42502 has a CVSS v3 base score of 6.1, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-42502 affect?

Published advisories record a fix for golang-golang-x-net (Debian), golang.org/x/net (Go), grafana (Red Hat / RHEL), grafana (Rocky), and 30 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-42502

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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 2026-07-23.