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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42570

30
FAUCET Score

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.

First published: Jun 9, 2026Last modified: Jun 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.6.3, < 5.8.1CPE matchmatch criteria
cpe:2.3:a:svelte:devalue:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 12th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: devalueFixed in: 5.8.1

Vendor Advisories (1)

npmGHSA-77vg-94rm-hx3phigh

Svelte devalue: DoS via sparse array deserialization

May 14, 2026

References

access.redhat.com / errata/RHSA-2026:37272
access.redhat.com / security/cve/CVE-2026-42570
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42570.json
github.com / sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d
Patch
github.com / sveltejs/devalue/releases/tag/v5.8.1
ProductRelease Notes
github.com / sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p
Vendor Advisory