What’s Vulnerable › Vulnerabilities

CVE-2026-57569: Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after DNS-based validation

• Severity: low (CVSS 2.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-15
• Weakness: CWE-367

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.

Affected products

• LycheeOrg Lychee: before 7.6.0

References

• https://github.com/LycheeOrg/Lychee/commit/a5f23e314f1a933d31aa650616bf9cd84bd0407e
• https://github.com/LycheeOrg/Lychee/pull/4344
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.6.0
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vj35-v9x5-vrxh
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vj35-v9x5-vrxh

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