CVE-2026-33644 Server-side request forgery in Lychee
Attackers can bypass SSRF protections in Lychee via DNS rebinding to access internal network resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33644?
CVE-2026-33644 is a low-severity server-side request forgery vulnerability in LycheeOrg Lychee, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-33644?
It affects 1 product.
Products include Lycheeorg Lychee.
How do I fix CVE-2026-33644?
No fix has been published for CVE-2026-33644 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-33644 being exploited?
There is no known exploitation of CVE-2026-33644 in the wild and no public exploit code.
Other vulnerabilities in LycheeOrg Lychee
- CVE-2023-52082 Lychee is vulnerable to an SQL Injection in explain DB queries.
- CVE-2024-25808 Cross-site request forgery in n/a
- CVE-2024-25807 Cross-site scripting in n/a
- CVE-2021-43675 Cross-site scripting in n/a
- CVE-2026-33537 Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked
Sources
Also known as GHSA-5245-4p8c-jwff.