CVE-2026-22775
📋 TL;DR
CVE-2026-22775 is a denial-of-service vulnerability in the Svelte devalue JavaScript library where specially crafted inputs cause excessive CPU and memory consumption during parsing. This affects applications using devalue.parse on untrusted external data, potentially crashing or degrading service. Systems processing user-supplied data with vulnerable devalue versions (5.1.0 to 5.6.1) are at risk.
💻 Affected Systems
- Svelte devalue
📦 What is this software?
Devalue by Svelte
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service through resource exhaustion, crashing applications or servers processing malicious inputs.
Likely Case
Performance degradation and service disruption when parsing malicious payloads from untrusted sources.
If Mitigated
Minimal impact if input validation or rate limiting prevents malicious payloads from reaching vulnerable parsing functions.
🎯 Exploit Status
Exploitation requires sending specially crafted input to applications using vulnerable devalue.parse. No authentication needed if application accepts external input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.6.2
Vendor Advisory: https://github.com/sveltejs/devalue/security/advisories/GHSA-g2pg-6438-jwpf
Restart Required: Yes
Instructions:
1. Update devalue dependency to version 5.6.2 or later. 2. For npm: run 'npm update devalue'. 3. For yarn: run 'yarn upgrade devalue'. 4. Restart application services.
🔧 Temporary Workarounds
Input validation
allValidate and sanitize all external inputs before passing to devalue.parse
Rate limiting
allImplement rate limiting on endpoints using devalue.parse to limit DoS impact
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all data passed to devalue.parse
- Isolate parsing functionality in separate processes with resource limits
🔍 How to Verify
Check if Vulnerable:
Check package.json or package-lock.json for devalue version between 5.1.0 and 5.6.1Check Version:
npm list devalue | grep devalueVerify Fix Applied:
Verify devalue version is 5.6.2 or higher in package.json and dependencies📡 Detection & Monitoring
Log Indicators:
- Unusually high CPU/memory usage spikes during data parsing
- Application crashes or timeouts when processing specific inputs
Network Indicators:
- Large or malformed payloads sent to endpoints using devalue.parse
SIEM Query:
source=application_logs AND ("devalue.parse" OR "parsing error") AND (cpu_usage>90 OR memory_usage>90)