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TI-2026-74840 Aliases CVE-2026-57569

DNS rebinding bypasses SSRF checks in Lychee photo URL import

Priority MEDIUM 45CWE-367Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Lychee before 7.6.0 is affected. The photo URL import checks a hostname and its resolved addresses, then fetches the same hostname later, so DNS answers can change between the check and the fetch (CWE-367). An authenticated attacker who controls DNS responses can make the server reach private or forbidden addresses, bypassing server-side request forgery protections.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00241 15th percentileScored 2026-11-07
Fix Fixed Lychee (LycheeOrg): 7.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LycheeOrgLycheebefore 7.6.07.6.0Patch availableCNA
  • Lychee VendorLycheeOrg Affected before 7.6.0 Fixed in 7.6.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*——LycheeOrg
  • cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:* Versions — — ·LycheeOrg

Remediation

Update Lychee to version 7.6.0, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Lychee (LycheeOrg) Fixed in 7.6.0

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-57569

References

Other 4

  • TI-2026-74843 Album password bypass in Lychee ZIP downloads CVSS 4.0HIGH 8.2
  • TI-2026-74842 Missing rate limiting in Lychee album unlock allows password guessing CVSS 3.1HIGH 7.5
  • TI-2024-16953 Cross-site Request Forgery (CSRF) vulnerability in Lychee version 3.1.6, allows remote… CVSS 3.1HIGH 8.3
  • TI-2026-74848 Lychee webshop checkout lets buyers override payment amount CVSS 4.0HIGH 8.3
  • TI-2026-74845 Payment bypass in Lychee webshop through unrestricted Dummy gateway CVSS 4.0HIGH 8.3
  • TI-2026-74846 Uncontrolled resource consumption in Lychee PDF processing CVSS 4.0HIGH 7.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences