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Medium

devalue has prototype pollution in devalue.parse and devalue.unflatten

  • Disclosed: 12.03.2026
  • Updated: 11.10.2026 10:22

In devalue v5.6.3, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion.

Affected software

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PlatformPackageVulnerable versionsFixed in
npm package devalue < 5.6.4 5.6.4

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-1321
Platform
npm
Package
devalue
Disclosed
12.03.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-cfw5-2vxh-hr84 - 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 sparse array deserialization
    High · 7.5 CVE-2026-42570 >= 5.6.3, < 5.8.1 5.8.1
  6. devalue has prototype pollution in devalue.parse and devalue.unflatten this entry
    Medium CVE-2026-30226 < 5.6.4 5.6.4
  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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