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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (20.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Lycheeorg Lychee — versions < 7.5.1
Weakness classification (CWE)
References
- github.com/LycheeOrg/Lychee/security/advisories/GHSA-vq6w-prpf-h287 (Exploit, Patch, Mitigation, Vendor Advisory)
- github.com/LycheeOrg/Lychee/commit/41386677681d18cd04e42a35b50bd88bf53a4a6a (Patch)
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.