What’s Vulnerable › Vulnerabilities

CVE-2026-49136: Banana Slides 0.4.0 Path Traversal via generate_image() in ai_service.py

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-22

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().

Affected products

• Anionex banana-slides: through 0.4.0

References

• https://github.com/Anionex/banana-slides/commit/e8bc490ec8b4b657e07dc3ab4e94fbedcaade421
• 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-image-in-ai-service-py

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