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

Quick assessment

Affected
LycheeOrg Lychee
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Lychee 是一款免费且开源的照片管理工具。在 7.7.0 版本之前，Lychee 在通过 Ghostscript 启用 ImageMagick 的 PDF 支持时，未在 方法中对 PDF 页面尺寸应用有效的预渲染限制。经过身份验证的攻击者若上传一个包含超大 的小尺寸 PDF 文件，可导致 在最终失败、无法生成图像之前消耗大量 CPU 资源。 当 设置为同步处理时，该请求可能长时间占用一个 Web 工作进程；而在官方推荐的异步 Docker 配置下，则可能阻塞共享的图像处理队列，从而延迟其他任务的处理。本安全公告

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
LycheeOrg Lychee < 7.7.0 affected
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I. Basic Information for CVE-2026-77467

Vulnerability Information
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Vulnerability Title
Lychee: A single 383-byte PDF causes ~184 seconds of CPU consumption in the real processing path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LycheeOrg Lychee < 7.7.0 -

II. Public POCs for CVE-2026-77467

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III. Intelligence Information for CVE-2026-77467

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Patches & Fixes for CVE-2026-77467 (2)

Vendor Advisories for CVE-2026-77467 (1)

Vendor Pages for CVE-2026-77467 (1)

Same Patch Batch · LycheeOrg · 2026-10-15 · 10 CVEs total

CVE-2026-62679 8.9 HIGH Lychee: Path traversal in `SecurePathController` allows authenticated arbitrary file read
CVE-2026-77470 8.3 HIGH Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway
CVE-2026-77466 8.3 HIGH Lychee: Webshop payment bypass via unrestricted "Dummy" gateway selection
CVE-2026-61838 8.2 HIGH Lychee: Album password bypass in ZIP downloads
CVE-2026-61611 7.5 HIGH Lychee: Missing rate limiting on album password unlock endpoint allows brute-force attacks
CVE-2026-77468 6.9 MEDIUM Lychee: Missing Authentication for Critical Function and Allocation of Resources Without L
CVE-2026-57568 5.7 MEDIUM Lychee: Stored XSS via Markdown javascript: Links in Photo and Album Descriptions (Gallery
CVE-2026-57569 2.3 LOW Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after D
CVE-2026-61610 2.3 LOW Lychee: unauthenticated photo starring reveals existence of private photos when photos_sta

IV. Related Vulnerabilities

Same product: Lychee
Same vendor: LycheeOrg
Same weakness: CWE-400

V. Comments for CVE-2026-77467

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