How severe is CVE-2026-27119?

CVE-2026-27119 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-27119 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27119?

CVE-2026-27119 affects Svelte. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27119?

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

Does CVE-2026-27119 have an EU (EUVD) identifier?

Yes. CVE-2026-27119 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7510.

When was CVE-2026-27119 published?

CVE-2026-27119 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-27119

CVE-2026-27119 is a medium-severity vulnerability in Svelte with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7510
Weakness: CWE-79
Affected product: Svelte
Published: 2026-02-20
Last modified: 2026-06-17

Description

svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

Frequently asked questions

What is CVE-2026-27119?: svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
How severe is CVE-2026-27119?: CVE-2026-27119 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-27119 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27119?: CVE-2026-27119 affects Svelte. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27119?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27119 have an EU (EUVD) identifier?: Yes. CVE-2026-27119 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7510.
When was CVE-2026-27119 published?: CVE-2026-27119 was published on 2026-02-20 and last updated on 2026-06-17.

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-h7h7-mm68-gmrc

Affected products (1)

cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*

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