CVE-2026-57569 Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after DNS-based validation
An authenticated attacker can bypass SSRF protections via DNS rebinding to access internal services from the Lychee server.
- 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-2026-57569?
CVE-2026-57569 is a low-severity server-side request forgery vulnerability in LycheeOrg Lychee, published on 15 Oct 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 7.6.0, the POST /api/v2/Photo::fromUrl flow validates a hostname and its resolved addresses in app/Rules/PhotoUrlRule.php but later passes the original hostname through app/Actions/Import/FromUrl.php to app/Image/Files/DownloadedFile.php for a separate fopen connection. An authenticated attacker who controls DNS responses can cause validation to observe a public address and the subsequent fetch to resolve the same hostname to a private or otherwise forbidden address. This DNS rebinding time-of-check to time-of-use mismatch bypasses the intended server-side request forgery protections and can reach services available from the Lychee server, subject to deployment and TLS behavior. This issue is fixed in version 7.6.0.
Which versions are affected by CVE-2026-57569?
How do I fix CVE-2026-57569?
No fix has been published for CVE-2026-57569 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-2026-57569 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57569 exists.
Sources
Also known as GHSA-vj35-v9x5-vrxh.