Answer in brief
CVE-2026-42570 records a High severity (CVSS 7.5) deserialization vulnerability in Svelte devalue: DoS via sparse array deserialization. The source record does not mark it as known exploited. 1 affected package is mapped in the feed.
Answer in brief
CVE-2026-42570 records a High severity (CVSS 7.5) deserialization vulnerability in Svelte devalue: DoS via sparse array deserialization. The source record does not mark it as known exploited. 1 affected package is mapped in the feed.
Update devalue to 5.8.1 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanDeserialization describes the vulnerability class recorded for this advisory. The current record does not mark CVE-2026-42570 as known exploited; continue to monitor the source for status changes. The feed includes package mappings that can be checked against lockfiles and deployed manifests.
| Package | Affected range | Fixed version |
|---|---|---|
| devaluenpm | >=5.6.3,<=5.8.0 | 5.8.1 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
CVE-2026-42570 records a High severity (CVSS 7.5) deserialization vulnerability in Svelte devalue: DoS via sparse array deserialization. The source record does not mark it as known exploited. 1 affected package is mapped in the feed.
The source record does not mark it as known exploited.
Check lockfiles and deployed manifests for devalue.
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate devalue to 5.8.1 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanDeserialization describes the vulnerability class recorded for this advisory. The current record does not mark CVE-2026-42570 as known exploited; continue to monitor the source for status changes. The feed includes package mappings that can be checked against lockfiles and deployed manifests.
| Package | Affected range | Fixed version |
|---|---|---|
| devaluenpm | >=5.6.3,<=5.8.0 | 5.8.1 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
CVE-2026-42570 records a High severity (CVSS 7.5) deserialization vulnerability in Svelte devalue: DoS via sparse array deserialization. The source record does not mark it as known exploited. 1 affected package is mapped in the feed.
The source record does not mark it as known exploited.
Check lockfiles and deployed manifests for devalue.
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardSvelte 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.
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.