PatchTheCVECVE-2020-25266: AppImage appimaged before 1.0.3 does not properly check whether a downloaded file is a valid appimage
CVE-2020-25266 is a medium-severity flaw (CVSS 5.5) affecting appimaged. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
AppImage appimaged before 1.0.3 does not properly check whether a downloaded file is a valid appimage. For example, it will accept a crafted mp3 file that contains an appimage, and install it.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 72%) |
| CISA exploited list | No |
| Weakness | CWE-494 |
| Published | 2020-12-02 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-25266?
appimaged: upgrade to 1.0.3. Exact commands for each OS are on this page.
Is CVE-2020-25266 being exploited?
CVE-2020-25266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-25266 affect?
CVE-2020-25266 affects appimaged. Severity is medium (CVSS 5.5). AppImage appimaged before 1.0.3 does not properly check whether a downloaded file is a valid appimage. For example, it will accept a crafted mp3 file that contains an appimage, and install it.
How urgent is CVE-2020-25266?
Priority 26/100. No elevated risk signals yet.