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Vulnerabilities

Security fix · CVE-2025-57820

Svelte devalue is a utility library.

Published Aug 26, 2025 · catalog updated Aug 27, 2025 · Svelte devalue is a

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-57820. EPSS is 0.37%. Act only if a listed version of Svelte devalue is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Svelte devalue is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Version ranges on file
Affected products
vendor sveltejs devalue < 5.3.2

Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor sveltejs devalue < 5.3.2< 5.3.2

How to fix CVE-2025-57820

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-57820. EPSS is 0.37%. Act only if a listed version of Svelte devalue is a is installed.

Which versions are affected?

Compare what you have installed with sveltejs devalue < 5.3.2 < 5.3.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 26, 2025 · EUVD

    Detected

    Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2

  2. Aug 27, 2025 · EUVD

    Updated

    Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2

Sources

  • CVE.orgVulnerability recordCVE-2025-57820

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-57820

    30-day exploitation probability 0.37%

    first.org
  • EUVDVulnerability recordEUVD-2025-25863

    Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leadin

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026