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Fencer Vulns
high 7.5

CVE-2026-42570 json

Svelte devalue: DoS via sparse array deserialization

published 2026-05-14 5 mo ago modified 2026-08-24 2 mo ago also EUVD-2026-35500 , GHSA-77vg-94rm-hx3p

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.

Patch / fix

  • npm devalue 5.8.1
  • Red Hat Red Hat Enterprise Linux 10 0:1.1.2-1.el10_2
  • Red Hat Red Hat Trusted Artifact Signer 1.4 1783327185
  • rh-podman-desktop RHEL 10.2 1.1.2-1.el10_2

red hat advisories RHSA-2026:57590

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42570 updated cvss 7.5

devalue: devalue: Excessive memory consumption via deserialization of sparse arrays

  • Red Hat Build of Podman Desktop rh-podman-desktop.git
    affected: workaround, no fix available
  • Red Hat Enterprise Linux Extensions Channel (v. 10) rh-podman-desktop 1.1.2-1.el10_2
    fixed: vendor fix RHSA-2026:57590
  • Red Hat Trusted Artifact Signer 1.4 rhtas/rekor-search-ui-rhel9 1783327185
    fixed: vendor fix RHSA-2026:37272
  • Red Hat Trusted Artifact Signer 1.4 rhtas/fulcio-rhel9 1783326847, rhtas/rekor-server-rhel9 1783332625, rhtas/trillian-redis-rhel9 1783329793, rhtas/trillian-database-rhel9 1783329793, rhtas/trillian-logserver-rhel9 1783329793, rhtas/trillian-logsigner-rhel9 1783329793, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm devalue
>=5.6.3, <5.8.1
5.8.1

Affected products

  • sveltejs devalue
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Trusted Artifact Signer 1.4
  • Red Hat Red Hat Build of Podman Desktop

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.