CVE-2026-33644: Lychee is a free, open-source photo-management tool

Q: How do I fix CVE-2026-33644?

lychee: upgrade to 7.5.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33644 being exploited?

CVE-2026-33644 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-2026-33644 affect?

CVE-2026-33644 affects lychee. Severity is medium (CVSS 4.3). Lychee is a free, open-source photo-management tool. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP addre

Q: How urgent is CVE-2026-33644?

Priority 24/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2026-33644 is a medium-severity flaw (CVSS 4.3) 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. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP address. When a domain name is used, `filter_var($host, FILTER_VALIDATE_IP)` returns `false`, skipping the entire check. Version 7.5.2 patches the issue.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
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: < 7.5.2

Fixed in: 7.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 7.5.2 (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-2026-33644?

lychee: upgrade to 7.5.2. Exact commands for each OS are on this page.

Is CVE-2026-33644 being exploited?

CVE-2026-33644 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-2026-33644 affect?

CVE-2026-33644 affects lychee. Severity is medium (CVSS 4.3). Lychee is a free, open-source photo-management tool. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP addre

How urgent is CVE-2026-33644?

Priority 24/100. Public exploit reference

Software pages

PHP vulnerabilities

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-2026-33537 MEDIUM 5.0 UPGRADE Lychee is a free, open-source photo-management tool

References

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