Which versions of Lychee are affected by EUVD-2026-16369?

Organizations using Lychee should be aware of moderate risk from CVE-2026-33537, a server-side request forgery vulnerability rated CVSS 5.3. Users could be tricked into performing unintended actions.. A patch is available.

Lychee EUVD-2026-16369

Q: What is the CVSS score of EUVD-2026-16369?

EUVD-2026-16369 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/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. EPSS exploitation probability: 0.0%.

| CVE-2026-33537 MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2026-03-26 GitHub_M

SSRF Lychee

5.3

CVSS 4.0 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

7.5.1

EUVD ID Assigned

Mar 26, 2026 - 20:31 euvd

EUVD-2026-16369

Analysis Generated

Mar 26, 2026 - 20:31 vuln.today

CVE Published

Mar 26, 2026 - 20:01 nvd

MEDIUM 5.3

DescriptionGitHub Advisory

Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via Photo::fromUrl) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.

AnalysisAI

Incomplete IP validation in Lychee's SSRF protection mechanism allows authenticated users to bypass all four security configuration settings by leveraging loopback and link-local addresses, enabling access to internal services. The vulnerability affects Lychee versions prior to 7.5.1 and requires prior authentication but carries low confidentiality impact. …

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Vulnerability AssessmentAI

Risk Assessment	The CVSS v4.0 score of 5.3 reflects a moderate risk profile with network-accessible attack vector, low attack complexity, and requirement for low-privilege authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An authenticated Lychee user with permission to import photos via URL crafts a request to Photo::fromUrl with a target address of 127.0.0.1:6379 (or similar loopback address) to probe an internal Redis instance, or uses fe80::1 to access link-local services such as cloud metadata endpoints or internal management interfaces. Because the IP validation does not properly block these address ranges, the request reaches the internal service, allowing the attacker to leak sensitive configuration, credentials, or service metadata. …
Remediation	Upgrade Lychee to version 7.5.1 or later, which contains the corrected IP validation logic for loopback and link-local address ranges. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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EUVD-2026-16369 vulnerability details – vuln.today

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