What’s Vulnerable › Vulnerabilities

CVE-2026-77467: Lychee: A single 383-byte PDF causes ~184 seconds of CPU consumption in the real processing path

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-20
• Weakness: CWE-400

Description

Lychee is a free, open-source photo-management tool. Prior to 7.7.0, Lychee enables ImageMagick PDF support with Ghostscript but does not apply an effective pre-render limit to PDF page dimensions in ImagickHandler::loadPdf(). An authenticated user who can upload a small PDF with an oversized /MediaBox can cause Imagick::readImage() to consume substantial CPU before failing to produce an image. When QUEUE_CONNECTION selects synchronous processing the request can occupy a web worker, while the official asynchronous Docker configuration can clog the shared image-processing queue and delay other work. The advisory did not identify a Ghostscript sandbox escape. This issue is fixed in version 7.7.0.

Affected products

• LycheeOrg Lychee: before 7.7.0

References

• https://github.com/LycheeOrg/Lychee/commit/1e92846af4c2d259a225cf4517de17efba04f945
• https://github.com/LycheeOrg/Lychee/pull/4511
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-6736-fhxv-3p79
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-6736-fhxv-3p79

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