CVE-2025-67899
📋 TL;DR
CVE-2025-67899 is an unbounded recursion vulnerability in uriparser library versions through 0.9.9 that allows stack exhaustion via specially crafted input with many commas. This affects any application using vulnerable uriparser versions for URI parsing, potentially causing denial of service. The impact is limited to availability rather than confidentiality or integrity.
💻 Affected Systems
- uriparser
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash or system instability due to stack overflow, leading to denial of service for all users of the affected service.
Likely Case
Application crash or hang when processing maliciously crafted URIs containing excessive commas, resulting in temporary service disruption.
If Mitigated
Minimal impact with proper input validation and resource limits in place; at most a single request failure.
🎯 Exploit Status
Proof of concept demonstrates simple URI construction with many commas; weaponization for DoS attacks is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.10.0 and later
Vendor Advisory: https://github.com/uriparser/uriparser/security/advisories
Restart Required: Yes
Instructions:
1. Update uriparser to version 0.10.0 or later. 2. Rebuild and redeploy any applications using uriparser. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation and length limits
allImplement input validation to reject URIs with excessive commas before parsing
Stack limit enforcement
linuxUse system or runtime stack size limits to prevent complete exhaustion
ulimit -s 8192 # Linux example to limit stack size
🧯 If You Can't Patch
- Implement strict input validation to reject URIs with more than a reasonable number of commas (e.g., >100)
- Deploy WAF rules to block requests with excessive commas in URI components
🔍 How to Verify
Check if Vulnerable:
Check uriparser version: ldd /path/to/application | grep uriparser && check linked versionCheck Version:
pkg-config --modversion uriparser 2>/dev/null || uriparser-config --version 2>/dev/null || check package managerVerify Fix Applied:
Verify uriparser version is 0.10.0 or later and test with known malicious URI containing many commas📡 Detection & Monitoring
Log Indicators:
- Application crashes with stack overflow errors
- High memory usage spikes during URI parsing
- Repeated failed requests with unusual URI patterns
Network Indicators:
- Incoming requests with URIs containing hundreds of commas
- Sudden increase in failed requests to URI parsing endpoints
SIEM Query:
source="application.logs" AND ("stack overflow" OR "segmentation fault") AND process="*uriparser*"