What is CVE-2026-33537?

CVE-2026-33537 is a medium-severity vulnerability in Lycheeorg Lychee, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-03-26.

How severe is CVE-2026-33537?

Medium severity. CVSS v3 base score is 5.0 out of 10.

SSRF in Lycheeorg Lychee

CVE-2026-33537

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (17.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.

Affected products

Lycheeorg Lychee — versions < 7.5.1

Weakness classification (CWE)

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

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33537?: CVE-2026-33537 is a medium-severity vulnerability in Lycheeorg Lychee, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-03-26.
How severe is CVE-2026-33537?: Medium severity. CVSS v3 base score is 5.0 out of 10.