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Medium

Svelte devalue: DoS via malformed input

  • Disclosed: 17.09.2026
  • Updated: 11.10.2026 10:22

Impact

devalue.parse prior to version 5.9.2 fails to reject out-of-bounds indices. Specially-crafted payloads can exploit this to cause devalue to alternate between different array representations, resulting in work that is quadratic with payload size.

Applications are potentially affected if they call devalue.parse with untrusted data.

Patches

The bug is fixed in devalue@5.9.2.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package devalue < 5.9.2 5.9.2

References

CVSS score 5.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE)
CWE-770
Platform
npm
Package
devalue
Disclosed
17.09.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-9rgm-9g3h-6x36 - CC BY 4.0

Vulnerability history: devalue

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (16) in the archive
Total entries
16
First → latest
08.2025 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 8
  • Medium 4
  • Low 4

Disclosures per year

Severity:
  1. devalue: `stringify`/`uneval` serialize shared memory
    High · 7.5 CVE-2026-92708 >= 5.1.0, < 5.9.3 5.9.3
  2. devalue: Repeated primitive strings cause quadratic expansion in uneval
    High ghsa-mcm9-63f2-9j32 < 5.9.3 5.9.3
  3. devalue: Custom ArrayBuffer revivers can bypass typed-array allocation validation
    High ghsa-r9w8-h9r3-54w4 < 5.9.3 5.9.3
  4. devalue: stringifyAsync can cause an unhandled rejection despite a caught returned promise
    High ghsa-x5rw-q4pp-hg5g >= 5.8.0, < 5.9.3 5.9.3
  5. Svelte devalue: DoS via malformed input this entry
    Medium · 5.3 CVE-2026-81176 < 5.9.2 5.9.2
  6. Svelte devalue: DoS via sparse array deserialization
    High · 7.5 CVE-2026-42570 >= 5.6.3, < 5.8.1 5.8.1
  7. devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse
    High · 7.5 CVE-2026-22775 >= 5.1.0, < 5.6.2 5.6.2
  8. Devalue is vulnerable to denial of service due to memory exhaustion in devalue.parse
    High · 7.5 CVE-2026-22774 >= 5.3.0, < 5.6.2 5.6.2
  9. devalue prototype pollution vulnerability
    High CVE-2025-57820 < 5.3.2 5.3.2

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