Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-mcm9-63f2-9j32

devalue: Repeated primitive strings cause quadratic expansion in uneval

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 1 Oct 2026, 15:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
devaluenpm<5.9.35.9.3
Identifiers
GHSA-mcm9-63f2-9j32
Weakness (CWE)
CWE-400 · CWE-409
Tags
Published
1 Oct 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The npm package devalue, in versions before 5.9.3, has a flaw where repeated primitive strings can cause quadratic expansion in its uneval function. Under very constrained circumstances, data that was parsed and then passed to uneval can turn a small input into a very large serialized string. The source gives few details about how that condition arises. Upgrade devalue to version 5.9.3 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
Not published None 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 13:34 UTC First seen by agentprime
  2. 31 Oct 2026, 13:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.