CVE-2026-33537: Lychee is a free, open-source photo-management tool

Q: How do I fix CVE-2026-33537?

lychee: upgrade to 7.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-33537 being exploited?

CVE-2026-33537 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33537 affect?

CVE-2026-33537 affects lychee. Severity is medium (CVSS 5.0). 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

Q: How urgent is CVE-2026-33537?

Priority 27/100. Public exploit reference

Routine

MEDIUM 5.0UPGRADE

CVE-2026-33537 is a medium-severity flaw (CVSS 5.0) affecting lychee. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lycheeorg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 21:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

lycheeorg lychee UPGRADE

Affected: < 7.5.1

Fixed in: 7.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lychee || rpm -q lychee || lychee --version

2. UPGRADE to 7.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lychee

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lychee

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33537?

lychee: upgrade to 7.5.1. Exact commands for each OS are on this page.

Is CVE-2026-33537 being exploited?

CVE-2026-33537 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33537 affect?

CVE-2026-33537 affects lychee. Severity is medium (CVSS 5.0). 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

How urgent is CVE-2026-33537?

Priority 27/100. Public exploit reference

Related CVEs

CVE-2026-39957 MEDIUM 4.3 UPGRADE Lychee is a free, open-source photo-management tool
CVE-2026-33738 MEDIUM 5.4 UPGRADE Lychee is a free, open-source photo-management tool
CVE-2026-33644 MEDIUM 4.3 UPGRADE Lychee is a free, open-source photo-management tool

References

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