High 7.1Published Oct 15, 2026

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

Updated under an hour ago (2026-10-19 06:20 UTC)

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It affects LycheeOrg Lychee. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.27%, higher than 18% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-400, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.27% (percentile 18)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

LycheeOrg Lychee lycheeorg:lychee (from the name)	before 7.7.0	CNA record

References

https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-6736-fhxv-3p79x-refsource-confirm
https://github.com/LycheeOrg/Lychee/pull/4511x-refsource-misc
https://github.com/LycheeOrg/Lychee/commit/1e92846af4c2d259a225cf4517de17efba04f945x-refsource-misc
https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.