CVE-2026-22189
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Panda3D's egg-mkfont tool. Attackers can exploit this by supplying an excessively long glyph pattern string, potentially leading to arbitrary code execution. All users running Panda3D versions up to 1.10.16 are affected.
💻 Affected Systems
- Panda3D
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attackers to install malware, steal data, or pivot to other systems.
Likely Case
Denial of service through application crashes, with potential for limited code execution depending on memory layout and exploit sophistication.
If Mitigated
Application crash without code execution if exploit attempts fail or memory protections are enabled.
🎯 Exploit Status
The vulnerability requires attacker control of the -gp parameter, which could come from user input, configuration files, or automated processing pipelines.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10.17 or later
Vendor Advisory: https://www.panda3d.org/
Restart Required: No
Instructions:
1. Check current Panda3D version using 'panda3d --version' or similar. 2. Update to version 1.10.17 or later via package manager or direct download. 3. Recompile any applications using Panda3D with the updated version.
🔧 Temporary Workarounds
Disable or restrict egg-mkfont usage
allRemove execute permissions from egg-mkfont binary or restrict its use to trusted users only
chmod -x /path/to/egg-mkfont
Input validation wrapper
linuxCreate a wrapper script that validates glyph pattern length before passing to egg-mkfont
#!/bin/bash
if [ ${#1} -gt 100 ]; then echo 'Glyph pattern too long'; exit 1; fi
egg-mkfont -gp "$1" "$@"
🧯 If You Can't Patch
- Implement strict input validation for all user-supplied glyph patterns
- Run egg-mkfont in a sandboxed environment with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check if egg-mkfont exists and test with a long glyph pattern: 'egg-mkfont -gp $(printf 'A%.0s' {1..500}) test.egg'Check Version:
panda3d --version 2>/dev/null || egg-mkfont --version 2>/dev/null || grep -i version /usr/share/doc/panda3d*/changelog*Verify Fix Applied:
After updating, attempt the same test with a long glyph pattern - application should handle it gracefully or reject input📡 Detection & Monitoring
Log Indicators:
- Segmentation fault or access violation logs from egg-mkfont
- Unusually long command-line arguments to egg-mkfont
Network Indicators:
- N/A - local vulnerability
SIEM Query:
process_name='egg-mkfont' AND (cmd_line_length>500 OR exit_code=139 OR exit_code=0xC0000005)