Vulnerability Description
Banana Slides through 0.4.0, patched in commit e8bc490, contains a path traversal vulnerability in the generate_image() function within the AI service backend that allows unauthenticated attackers to read arbitrary image-format files outside the intended uploads directory by exploiting an incomplete path prefix check using os.path.startswith() without a trailing separator. Attackers can supply crafted markdown image references in user-controlled page descriptions that resolve to sibling directories whose names share the uploads folder prefix, bypassing the directory confinement check and causing the application to read files from unintended locations via PIL Image.open().
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/Anionex/banana-slides/commit/e8bc490ec8b4b657e07dc3ab4e94fbed
- https://github.com/Anionex/banana-slides/issues/429
- https://github.com/Anionex/banana-slides/pull/430
- https://www.vulncheck.com/advisories/banana-slides-path-traversal-via-generate-i
FAQ
What is CVE-2026-49136?
CVE-2026-49136 is a vulnerability with a CVSS score of 7.5 (HIGH). Banana Slides through 0.4.0, patched in commit e8bc490, contains a path traversal vulnerability in the generate_image() function within the AI service backend that allows unauthenticated attackers to ...
How severe is CVE-2026-49136?
CVE-2026-49136 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49136?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.