CVE-2026-24909
📋 TL;DR
CVE-2026-24909 is a path traversal vulnerability in vlt (vltpkg) that allows attackers to write arbitrary files outside the intended extraction directory during tar archive processing. This affects systems using vlt versions before 1.0.0-rc.10 for package management or archive extraction. The vulnerability could lead to arbitrary file overwrite, potentially enabling remote code execution or system compromise.
💻 Affected Systems
- vlt (vltpkg)
⚠️ 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
Remote code execution through overwriting critical system files or configuration files, leading to complete system compromise.
Likely Case
Arbitrary file overwrite in the extraction context, potentially modifying application files, configuration, or deploying malicious payloads.
If Mitigated
Limited to file writes within user permissions, potentially causing data corruption or denial of service.
🎯 Exploit Status
Exploitation requires the victim to process a malicious tar archive, which could be delivered through compromised packages or direct uploads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.0-rc.10 and later
Vendor Advisory: https://github.com/vltpkg/vltpkg/releases/tag/v1.0.0-rc.10
Restart Required: No
Instructions:
1. Update vlt to version 1.0.0-rc.10 or later using your package manager. 2. Verify the update with 'vlt --version'. 3. Rebuild any applications or processes that depend on vlt.
🔧 Temporary Workarounds
Avoid processing untrusted tar archives
allDo not extract tar archives from untrusted sources using vlt until patched.
Use alternative extraction tools
linuxTemporarily use tar, gzip, or other trusted extraction utilities instead of vlt for tar processing.
tar -xzf archive.tar.gz
gunzip -c archive.tar.gz | tar -x
🧯 If You Can't Patch
- Implement strict input validation: only allow tar archives from trusted, verified sources.
- Run vlt with minimal privileges and in isolated environments (containers, sandboxes) to limit potential damage.
🔍 How to Verify
Check if Vulnerable:
Run 'vlt --version' and check if version is earlier than 1.0.0-rc.10.Check Version:
vlt --versionVerify Fix Applied:
Confirm version is 1.0.0-rc.10 or later with 'vlt --version' and test extraction with a known safe tar archive.📡 Detection & Monitoring
Log Indicators:
- Unexpected file write operations outside expected extraction directories
- Failed path validation errors in vlt logs
Network Indicators:
- Downloads of tar archives from untrusted sources followed by vlt extraction
SIEM Query:
process.name:vlt AND file.path:*../*