High
calibre — security advisory
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.
- Products
- calibre
- Affected versions
- 2.33.0+dfsg-1build1, 2.38.0+dfsg-1, 2.45.0+dfsg-1, 2.45.0+dfsg-1build1, 2.48.0+dfsg-1, 2.48.0+dfsg-1build1, 2.54.0+dfsg-1, 2.55.0+dfsg-1, 2.55.0+dfsg-1ubuntu0.2, 3.12.0+dfsg-1, 3.13.0+dfsg-1, 3.14.0+dfsg-1, 3.15.0.1+dfsg-1, 3.16.0+dfsg-1, 3.16.0+dfsg-1build1, 3.17.0+dfsg-1, 3.17.0+dfsg-2, 3.18.0+dfsg-1build1, 3.19.0+dfsg-1, 3.20.0+dfsg-1, 3.21.0+dfsg-1, 3.21.0+dfsg-1build1, 3.46.0+dfsg-1, 3.7.0+dfsg-2, 3.7.0+dfsg-2build1, 4.2.0+dfsg-2, 4.3.0+dfsg-1, 4.3.0+dfsg-2, 4.4.0+dfsg-1, 4.5.0+dfsg-1, 4.5.0+dfsg-2, 4.5.0+dfsg-3, 4.6.0+dfsg-1, 4.7.0+dfsg-1, 4.99.3+dfsg-2, 4.99.4+dfsg+really4.10.0+py3-2, 4.99.4+dfsg+really4.11.2-1, 4.99.4+dfsg+really4.11.2-1build1, 4.99.4+dfsg+really4.12.0-1, 4.99.4+dfsg+really4.12.0-1build1, 4.99.4+dfsg+really4.12.0-1ubuntu1, 4.99.4+dfsg-1, 4.99.4+dfsg-1build1, 5.25.0+dfsg-2, 5.33.2+dfsg-1, 5.34.0+dfsg-1, 5.35.0+dfsg-1ubuntu2, 5.37.0+dfsg-1, 5.37.0+dfsg-1build1, 6.24.0+ds-1, 6.29.0+ds-1, 7.0.0+ds-1, 7.1.0+ds-1, 7.1.0+ds-2, 7.2.0+ds-1, 7.2.0+ds-1build1, 7.26.0+ds-4build1, 7.3.0+ds-1, 7.4.0+ds-1, 7.5.1+ds-1, 7.5.1+ds-2, 7.5.1+ds-3, 7.6.0+ds-1, 7.6.0+ds-1build1, 8.13.0+ds+~0.10.5-3, 8.14.0+ds+~0.10.5-1, 8.15.0+ds+~0.10.5-1, 8.16.0+ds+~0.10.5-2, 8.16.2+ds+~0.10.5-1, 8.16.2+ds+~0.10.5-2, 8.16.2+ds+~0.10.5-3, 8.3.0+ds-1, 8.4.0+ds-1, 8.5.0+ds-1, 8.6.0+ds-1, 8.7.0+ds-1, 8.8.0+ds-2, 8.8.0+ds-3, 8.8.0+ds-3build1, 9.11.0+ds+~0.10.6-1, 9.11.0+ds+~0.10.6-2, 9.13.0+ds+~0.10.6-1, 9.14.0+ds+~0.10.6-2build1, 9.2.1+ds+~0.10.5-2build1, 9.9.0+ds+~0.10.6-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-30853
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:06 UTC · Revision 1
Source evidence
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.
osv:UBUNTU-CVE-2026-30853
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
calibre
Fixed versions: Not specified
Complete source record
{
"id": "0a0afc8081c2fa43646fbd4a5b5613137cf471c681b243e5678cbba8c4afc030",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-30853",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-30853",
"summary": "calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.",
"evidence": "osv:UBUNTU-CVE-2026-30853",
"products": [
{
"name": {
"value": "calibre",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.33.0+dfsg-1build1",
"evidence": "/affected/0/versions"
},
{
"value": "2.38.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.45.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.45.0+dfsg-1build1",
"evidence": "/affected/0/versions"
},
{
"value": "2.48.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.48.0+dfsg-1build1",
"evidence": "/affected/0/versions"
},
{
"value": "2.54.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "2.55.0+dfsg-1ubuntu0.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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},
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"affected_versions": [
{
"value": "3.7.0+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.7.0+dfsg-2build1",
"evidence": "/affected/1/versions"
},
{
"value": "3.12.0+dfsg-1",
"evidence": "/affected/1/versions"
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{
"value": "3.13.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.14.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.15.0.1+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.16.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.16.0+dfsg-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "3.17.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.17.0+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.18.0+dfsg-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "3.19.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.20.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.21.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.21.0+dfsg-1build1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "calibre",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.46.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.0+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.3.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.3.0+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.4.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.0+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.0+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "4.6.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.3+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.10.0+py3-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.11.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.11.2-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.12.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.12.0-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "4.99.4+dfsg+really4.12.0-1ubuntu1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "calibre",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.25.0+dfsg-2",
"evidence": "/affected/3/versions"
},
{
"value": "5.33.2+dfsg-1",
"evidence": "/affected/3/versions"
},
{
"value": "5.34.0+dfsg-1",
"evidence": "/affected/3/versions"
},
{
"value": "5.35.0+dfsg-1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "5.37.0+dfsg-1",
"evidence": "/affected/3/versions"
},
{
"value": "5.37.0+dfsg-1build1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "calibre",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.24.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "6.29.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.0.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.1.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.1.0+ds-2",
"evidence": "/affected/4/versions"
},
{
"value": "7.2.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.2.0+ds-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "7.3.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.4.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.5.1+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.5.1+ds-2",
"evidence": "/affected/4/versions"
},
{
"value": "7.5.1+ds-3",
"evidence": "/affected/4/versions"
},
{
"value": "7.6.0+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.6.0+ds-1build1",
"evidence": "/affected/4/versions"
}
]
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{
"name": {
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"evidence": "/affected/5/package/name"
},
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{
"value": "7.26.0+ds-4build1",
"evidence": "/affected/5/versions"
},
{
"value": "8.3.0+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.4.0+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.5.0+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.6.0+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.7.0+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.8.0+ds-2",
"evidence": "/affected/5/versions"
},
{
"value": "8.8.0+ds-3",
"evidence": "/affected/5/versions"
},
{
"value": "8.8.0+ds-3build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "calibre",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.2.1+ds+~0.10.5-2build1",
"evidence": "/affected/6/versions"
},
{
"value": "9.9.0+ds+~0.10.6-1",
"evidence": "/affected/6/versions"
},
{
"value": "9.11.0+ds+~0.10.6-1",
"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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]
},
{
"name": {
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},
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{
"value": "8.8.0+ds-3build1",
"evidence": "/affected/7/versions"
},
{
"value": "8.13.0+ds+~0.10.5-3",
"evidence": "/affected/7/versions"
},
{
"value": "8.14.0+ds+~0.10.5-1",
"evidence": "/affected/7/versions"
},
{
"value": "8.15.0+ds+~0.10.5-1",
"evidence": "/affected/7/versions"
},
{
"value": "8.16.0+ds+~0.10.5-2",
"evidence": "/affected/7/versions"
},
{
"value": "8.16.2+ds+~0.10.5-1",
"evidence": "/affected/7/versions"
},
{
"value": "8.16.2+ds+~0.10.5-2",
"evidence": "/affected/7/versions"
},
{
"value": "8.16.2+ds+~0.10.5-3",
"evidence": "/affected/7/versions"
},
{
"value": "9.2.1+ds+~0.10.5-2build1",
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]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-30853",
"aliases": [
"UBUNTU-CVE-2026-30853"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "calibre",
"purl": "pkg:deb/ubuntu/calibre?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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"2.38.0+dfsg-1",
"2.45.0+dfsg-1",
"2.45.0+dfsg-1build1",
"2.48.0+dfsg-1",
"2.48.0+dfsg-1build1",
"2.54.0+dfsg-1",
"2.55.0+dfsg-1",
"2.55.0+dfsg-1ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "2.55.0+dfsg-1ubuntu0.2"
},
{
"binary_name": "calibre-bin",
"binary_version": "2.55.0+dfsg-1ubuntu0.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "calibre",
"purl": "pkg:deb/ubuntu/calibre?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"3.7.0+dfsg-2",
"3.7.0+dfsg-2build1",
"3.12.0+dfsg-1",
"3.13.0+dfsg-1",
"3.14.0+dfsg-1",
"3.15.0.1+dfsg-1",
"3.16.0+dfsg-1",
"3.16.0+dfsg-1build1",
"3.17.0+dfsg-1",
"3.17.0+dfsg-2",
"3.18.0+dfsg-1build1",
"3.19.0+dfsg-1",
"3.20.0+dfsg-1",
"3.21.0+dfsg-1",
"3.21.0+dfsg-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "3.21.0+dfsg-1build1"
},
{
"binary_name": "calibre-bin",
"binary_version": "3.21.0+dfsg-1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "calibre",
"purl": "pkg:deb/ubuntu/calibre?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"3.46.0+dfsg-1",
"4.2.0+dfsg-2",
"4.3.0+dfsg-1",
"4.3.0+dfsg-2",
"4.4.0+dfsg-1",
"4.5.0+dfsg-1",
"4.5.0+dfsg-2",
"4.5.0+dfsg-3",
"4.6.0+dfsg-1",
"4.7.0+dfsg-1",
"4.99.3+dfsg-2",
"4.99.4+dfsg-1",
"4.99.4+dfsg-1build1",
"4.99.4+dfsg+really4.10.0+py3-2",
"4.99.4+dfsg+really4.11.2-1",
"4.99.4+dfsg+really4.11.2-1build1",
"4.99.4+dfsg+really4.12.0-1",
"4.99.4+dfsg+really4.12.0-1build1",
"4.99.4+dfsg+really4.12.0-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
},
{
"binary_name": "calibre-bin",
"binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "calibre",
"purl": "pkg:deb/ubuntu/calibre?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"5.25.0+dfsg-2",
"5.33.2+dfsg-1",
"5.34.0+dfsg-1",
"5.35.0+dfsg-1ubuntu2",
"5.37.0+dfsg-1",
"5.37.0+dfsg-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "5.37.0+dfsg-1build1"
},
{
"binary_name": "calibre-bin",
"binary_version": "5.37.0+dfsg-1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "calibre",
"purl": "pkg:deb/ubuntu/calibre?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"6.24.0+ds-1",
"6.29.0+ds-1",
"7.0.0+ds-1",
"7.1.0+ds-1",
"7.1.0+ds-2",
"7.2.0+ds-1",
"7.2.0+ds-1build1",
"7.3.0+ds-1",
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],
"modified": "2026-10-17T12:58:08.297816045Z",
"provider": "osv",
"upstream": [
"CVE-2026-30853"
],
"references": [
"https://ubuntu.com/security/CVE-2026-30853",
"https://www.cve.org/CVERecord?id=CVE-2026-30853",
"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x"
]
},
"related_cves": [
{
"value": "CVE-2026-30853",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 358202,
"published_at": "2026-03-13T19:54:00+00:00"
}