High
libdancer2-perl — security advisory
Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for `/../outside.txt` escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.
- Products
- libdancer2-perl
- Affected versions
- 0.160003+dfsg-1, 0.163000+dfsg-1, 0.166001+dfsg-1, 0.205000+dfsg-1, 0.205002+dfsg-1, 0.205002+dfsg-2, 0.208001+dfsg-1, 0.208002+dfsg-1, 0.300000+dfsg-1, 0.300005+dfsg-1, 0.301004+dfsg-1, 0.400001+dfsg-1, 1.0.0+dfsg-1, 1.1.0+dfsg-1, 1.1.2+dfsg-1, 2.1.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93712
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:33 UTC · Revision 1
Source evidence
Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for `/../outside.txt` escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.
osv:UBUNTU-CVE-2026-93712
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
libdancer2-perl
Fixed versions: Not specified
Complete source record
{
"id": "d60a7d9c33acae9712641eea47561ad69e3a75e018625035637267468dbe9655",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93712",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93712",
"summary": "Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for `/../outside.txt` escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.",
"evidence": "osv:UBUNTU-CVE-2026-93712",
"products": [
{
"name": {
"value": "libdancer2-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.160003+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.163000+dfsg-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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]
},
{
"name": {
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"affected_versions": [
{
"value": "0.205000+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.205002+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.205002+dfsg-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
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"affected_versions": [
{
"value": "0.208001+dfsg-1",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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]
},
{
"name": {
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"evidence": "/affected/3/package/name"
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"affected_versions": [
{
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{
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"evidence": "/affected/3/versions"
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{
"name": {
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "0.400001+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.0.0+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.1.0+dfsg-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libdancer2-perl",
"evidence": "/affected/5/package/name"
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"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
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{
"value": "2.1.0-1",
"evidence": "/affected/5/versions"
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},
{
"name": {
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"evidence": "/affected/6/package/name"
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"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.1.2+dfsg-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-93712",
"aliases": [
"UBUNTU-CVE-2026-93712"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libdancer2-perl",
"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.160003+dfsg-1",
"0.163000+dfsg-1",
"0.166001+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libdancer2-perl",
"binary_version": "0.166001+dfsg-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "libdancer2-perl",
"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.205000+dfsg-1",
"0.205002+dfsg-1",
"0.205002+dfsg-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libdancer2-perl",
"binary_version": "0.205002+dfsg-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libdancer2-perl",
"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.208001+dfsg-1",
"0.208002+dfsg-1",
"0.300000+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.300005+dfsg-1",
"0.301004+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
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"binary_name": "libdancer2-perl",
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{
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"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.400001+dfsg-1",
"1.0.0+dfsg-1",
"1.1.0+dfsg-1"
],
"database_specific": {
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"binary_name": "libdancer2-perl",
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.1.2+dfsg-1",
"2.1.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
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"binary_name": "libdancer2-perl",
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}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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"package": {
"name": "libdancer2-perl",
"purl": "pkg:deb/ubuntu/libdancer2-perl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.1.2+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93712.json"
},
"ecosystem_specific": {
"binaries": [
{
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}
],
"modified": "2026-10-17T13:01:18.663743154Z",
"provider": "osv",
"upstream": [
"CVE-2026-93712"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93712",
"https://www.cve.org/CVERecord?id=CVE-2026-93712",
"https://lists.security.metacpan.org/cve-announce/msg/43742973/",
"https://github.com/PerlDancer/Dancer2/security/advisories/GHSA-6xw8-v24c-m783",
"https://github.com/PerlDancer/Dancer2/commit/2446a09ffb83fef71cc75c327bd6e4b1f007b885.patch",
"https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes"
]
},
"related_cves": [
{
"value": "CVE-2026-93712",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361608,
"published_at": "2026-09-22T01:16:00+00:00"
}