CVE-2026-24797
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in the libjpeg-turbo library used by cupoch's tjbench utility. Attackers could exploit this to execute arbitrary code or cause denial of service by manipulating JPEG image processing. Users of cupoch software that includes the vulnerable libjpeg-turbo module are affected.
💻 Affected Systems
- cupoch (neka-nat/cupoch)
⚠️ 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 leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash causing denial of service, potentially with memory corruption that could be leveraged for further exploitation.
If Mitigated
Contained application crash without privilege escalation if proper sandboxing and memory protections are enabled.
🎯 Exploit Status
Exploitation requires crafting malicious JPEG files that trigger the out-of-bounds write condition during processing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version incorporating pull request #138
Vendor Advisory: https://github.com/neka-nat/cupoch/pull/138
Restart Required: Yes
Instructions:
1. Update cupoch to latest version. 2. Ensure libjpeg-turbo dependency is updated. 3. Restart any services using cupoch.
🔧 Temporary Workarounds
Disable tjbench utility
allRemove or disable the vulnerable tjbench component if not required
sudo rm /path/to/tjbench
chmod -x /path/to/tjbench
Restrict file processing
allLimit JPEG file processing to trusted sources only
🧯 If You Can't Patch
- Implement strict input validation for JPEG files before processing
- Run cupoch in sandboxed/containerized environment with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check if tjbench exists and cupoch version predates pull request #138 integrationCheck Version:
cupoch --version or check package manager for cupoch versionVerify Fix Applied:
Verify cupoch version includes the fix from pull request #138 and tjbench no longer crashes with test JPEGs📡 Detection & Monitoring
Log Indicators:
- Application crashes in tjbench
- Memory access violation errors
- Unexpected process termination during JPEG processing
Network Indicators:
- Unusual file uploads to systems using cupoch
- Suspicious JPEG file transfers
SIEM Query:
process_name:tjbench AND (event_type:crash OR exit_code:139)