CVE-2026-57569
LOW 2.3Lychee 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.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 15th percentile
Impact if exploited
2.3CVSS 4.0 · LOW
- ConfidentialityNone
- IntegrityNone
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ⚠Complexity: Needs a race window or specific setup
- ⚠Requirements: Specific conditions must be present
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-367: : Time-of-check Time-of-use (TOCTOU) Race Condition
- CWE-918: : Server-Side Request Forgery (SSRF)
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L
References and research data (JSON)
All CVSS metrics
- LOW 2.3 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L - LOW 2.3 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vj35-v9x5-vrxh CVE record · GitHub_M · Updated 2026-10-15T16:24:34.652Z
CVE record · CISA-ADP · Updated 2026-10-15T17:58:10.062Z
NVD · CVE-2026-57569 · Updated 2026-10-15T21:08:49.703
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102188 EUVD · EUVD-2026-102188
Technical & other
- https://github.com/LycheeOrg/Lychee/pull/4344 CVE record · GitHub_M · Updated 2026-10-15T16:24:34.652Z
NVD · CVE-2026-57569 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/commit/a5f23e314f1a933d31aa650616bf9cd84bd0407e CVE record · GitHub_M · Updated 2026-10-15T16:24:34.652Z
NVD · CVE-2026-57569 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/releases/tag/v7.6.0 CVE record · GitHub_M · Updated 2026-10-15T16:24:34.652Z
NVD · CVE-2026-57569 · Updated 2026-10-15T21:08:49.703