Svelte devalue: DoS via sparse array deserialization

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-42570
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 17:17:07 UTC
Updated2026-07-15 02:21:34 UTC
DescriptionSvelte 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003930000 probability, percentile 0.314890000 (date 2026-07-15)

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling | CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Svelte Devalue All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sveltejs Devalue affected >= 5.6.3, < 5.8.1 Not specified
ADP Red Hat Red Hat Trusted Artifact Signer 1.4 unaffected 1783327185 * rpm Not specified
ADP Red Hat Red Hat Build Of Podman Desktop Not specified Not specified

References

ReferenceSourceLinkTags
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42570.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:37272 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p [email protected] github.com Vendor Advisory
access.redhat.com/security/cve/CVE-2026-42570 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/sveltejs/devalue/releases/tag/v5.8.1 [email protected] github.com Product, Release Notes
github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-06-09T17:01:16.012ZReported to Red Hat.
ADP2026-06-09T16:12:26.377ZMade public.

Solutions

ADP: RHSA-2026:37272: Red Hat Trusted Artifact Signer 1.4

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