Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-57569— Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after DNS-based validation

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 是一款免费的开源照片管理工具。在版本 7.6.0 之前， 请求的处理流程中，系统会先通过 对主机名及其解析出的地址进行验证；但随后，该请求又会通过 将原始主机名传递至 ，以建立独立的 连接发起获取操作。 攻击者若在控制 DNS 响应的前提下，可使验证阶段观察到的是一个公网地址，而随后的实际获取请求却会将同一主机名解析为一个私有地址或其他被禁止访问的地址。这种“检查时”与“使用时”之间的 DNS 重绑定时间差问题，绕过了预期的服务端请求伪造（SSRF）防护措施，从而可能访问到仅从 Lychee 服务器可

CVSS 2.3 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
LycheeOrg Lychee < 7.6.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-57569

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after DNS-based validation
Source: CVE Program / CVE List V5
Vulnerability Description
Lychee is a free, open-source photo-management tool. Prior to 7.6.0, the POST /api/v2/Photo::fromUrl flow validates a hostname and its resolved addresses in app/Rules/PhotoUrlRule.php but later passes the original hostname through app/Actions/Import/FromUrl.php to app/Image/Files/DownloadedFile.php for a separate fopen connection. An authenticated attacker who controls DNS responses can cause validation to observe a public address and the subsequent fetch to resolve the same hostname to a private or otherwise forbidden address. This DNS rebinding time-of-check to time-of-use mismatch bypasses the intended server-side request forgery protections and can reach services available from the Lychee server, subject to deployment and TLS behavior. This issue is fixed in version 7.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LycheeOrg Lychee < 7.6.0 -

II. Public POCs for CVE-2026-57569

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-57569

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-57569 (1)

Vendor Advisories for CVE-2026-57569 (1)

Vendor Pages for CVE-2026-57569 (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-2026-77467 7.1 HIGH Lychee: A single 383-byte PDF causes ~184 seconds of CPU consumption in the real processin
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-2026-61610 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-367

V. Comments for CVE-2026-57569

No comments yet

Leave a comment