CVE-2026-77467
HIGH 7.1Lychee 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.
Severe if exploited (CVSS 7.1), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 27th percentile
Impact if exploited
7.1CVSS 4.0 · HIGH
- ConfidentialityNone
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-400: : Uncontrolled Resource Consumption
- CWE-770: : Allocation of Resources Without Limits or Throttling
CVSS vector
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
References and research data (JSON)
All CVSS metrics
- HIGH 7.1 v4.0 · CNA Primary
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 - HIGH 7.1 v4.0 · NVD Secondary
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-6736-fhxv-3p79 CVE record · GitHub_M · Updated 2026-10-15T16:34:35.236Z
CVE record · CISA-ADP · Updated 2026-10-20T02:50:18.889Z
NVD · CVE-2026-77467 · Updated 2026-10-20T03:17:16.690
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102194 EUVD · EUVD-2026-102194
Technical & other
- https://github.com/LycheeOrg/Lychee/pull/4511 CVE record · GitHub_M · Updated 2026-10-15T16:34:35.236Z
NVD · CVE-2026-77467 · Updated 2026-10-20T03:17:16.690 - https://github.com/LycheeOrg/Lychee/commit/1e92846af4c2d259a225cf4517de17efba04f945 CVE record · GitHub_M · Updated 2026-10-15T16:34:35.236Z
NVD · CVE-2026-77467 · Updated 2026-10-20T03:17:16.690 - https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0 CVE record · GitHub_M · Updated 2026-10-15T16:34:35.236Z
NVD · CVE-2026-77467 · Updated 2026-10-20T03:17:16.690