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Svelte CVE-2026-27125

MEDIUM
Improperly Controlled Modification of Dynamically-Determined Object Attributes (CWE-915)
2026-02-20 security-advisories@github.com GHSA-crpf-4hrx-3jrp
Code Injection Svelte Red Hat
6.8
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
6.8 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Red Hat
5.6 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
Patch released
Feb 23, 2026 - 20:52 nvd
Patch available
CVE Published
Feb 20, 2026 - 23:16 nvd
MEDIUM 6.8

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 npm packages depend on svelte (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 5.51.5.

DescriptionGitHub Advisory

svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted - a precondition outside of Svelte's control - this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

AnalysisAI

Svelte versions prior to 5.51.5 improperly enumerate prototype chain properties during server-side rendering attribute spreading, allowing polluted Object.prototype properties to inject unexpected attributes into SSR output or cause rendering errors. This vulnerability affects applications using SSR where the prototype chain has been previously manipulated, though client-side rendering is unaffected. …

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Vulnerability AssessmentAI

Risk Assessment CVSS 6.8 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-27125 vulnerability details – vuln.today
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