How severe is CVE-2026-42506?

CVE-2026-42506 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-42506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42506?

CVE-2026-42506 affects Golang Net. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42506 have an EU (EUVD) identifier?

Yes. CVE-2026-42506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31446.

When was CVE-2026-42506 published?

CVE-2026-42506 was published on 2026-05-22 and last updated on 2026-06-17.

CVE-2026-42506

CVE-2026-42506 is a medium-severity vulnerability in Golang Net with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31446
Weakness: CWE-79
Affected product: Golang Net
Published: 2026-05-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-42506?: 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.
How severe is CVE-2026-42506?: CVE-2026-42506 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-42506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42506?: CVE-2026-42506 affects Golang Net. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42506 have an EU (EUVD) identifier?: Yes. CVE-2026-42506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31446.
When was CVE-2026-42506 published?: CVE-2026-42506 was published on 2026-05-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:golang:net:*:*:*:*:*:go:*:*

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