Medium
Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked
Type: advisorySources: OSV
Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33537
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 16:08 UTC · Revision 1
Source evidence
Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked
core-osv · Original sourcePublished 26 Mar 2026, 20:01 UTC
Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.
osv:CVE-2026-33537
Complete source record
{
"id": "067e6838374b0d61bea939fa6e954e8a1f1f91e034d154d54e9f40aca0b0e90e",
"url": "https://osv.dev/vulnerability/CVE-2026-33537",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked",
"summary": "Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.",
"evidence": "osv:CVE-2026-33537",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-33537",
"aliases": [
"CVE-2026-33537",
"GHSA-vq6w-prpf-h287"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/lycheeorg/lychee",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "41386677681d18cd04e42a35b50bd88bf53a4a6a"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "7.5.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "41386677681d18cd04e42a35b50bd88bf53a4a6a"
}
],
"source": "REFERENCES_COMMIT"
},
{
"cpe": "cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "7.5.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33537.json"
}
}
],
"modified": "2026-10-28T02:30:30.175489997Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33537.json",
"https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vq6w-prpf-h287",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33537",
"https://github.com/LycheeOrg/Lychee/commit/41386677681d18cd04e42a35b50bd88bf53a4a6a"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33537.json"
}
},
"related_cves": [
{
"value": "CVE-2026-33537",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497143,
"published_at": "2026-03-26T20:01:19.377+00:00"
}