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Review reviewHigh

CVE-2026-22775

sveltejs devalue, Red Hat Trusted Artifact Signer 1.2, Red Hat Trusted Artifact Signer 1.3

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.

CVSS
7.5
EPSS
0.57%
44.0% percentile
CISA KEV
Not listed
Published
2026.01.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.57%
Technical severityCVSS 7.5

Vulnerability overview

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.

Affected product and versions

Product
sveltejs devalue, Red Hat Trusted Artifact Signer 1.2, Red Hat Trusted Artifact Signer 1.3
Affected versions
>= >= 5.1.0, < 5.6.2, >= 5.1.0 < 5.6.2
Fixed versions
5.6.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that sveltejs devalue, Red Hat Trusted Artifact Signer 1.2, Red Hat Trusted Artifact Signer 1.3 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-405