High
calibre — security advisory
calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.
- 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-2026-25731
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:51 UTC · Revision 1
Source evidence
calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.
osv:UBUNTU-CVE-2026-25731
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": "72117d8b1d33757cf239df41ad999fbe7b3489b08c8530a80a84bb7396f4a3fd",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-25731",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-25731",
"summary": "calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.",
"evidence": "osv:UBUNTU-CVE-2026-25731",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
"value": "3.17.0+dfsg-1",
"evidence": "/affected/1/versions"
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{
"value": "3.17.0+dfsg-2",
"evidence": "/affected/1/versions"
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{
"value": "3.18.0+dfsg-1build1",
"evidence": "/affected/1/versions"
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{
"value": "3.19.0+dfsg-1",
"evidence": "/affected/1/versions"
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{
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{
"value": "3.21.0+dfsg-1",
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{
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"affected_versions": [
{
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{
"value": "4.2.0+dfsg-2",
"evidence": "/affected/2/versions"
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{
"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"
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{
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{
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{
"value": "4.99.4+dfsg+really4.10.0+py3-2",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
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{
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{
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{
"name": {
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},
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{
"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": {
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"evidence": "/affected/4/package/name"
},
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{
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{
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{
"value": "7.0.0+ds-1",
"evidence": "/affected/4/versions"
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{
"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"
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{
"value": "7.5.1+ds-1",
"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
},
{
"value": "7.5.1+ds-3",
"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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{
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{
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{
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"evidence": "/affected/5/versions"
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{
"value": "8.8.0+ds-2",
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{
"value": "8.8.0+ds-3",
"evidence": "/affected/5/versions"
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{
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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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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-25731",
"aliases": [
"UBUNTU-CVE-2026-25731"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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],
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
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"3.20.0+dfsg-1",
"3.21.0+dfsg-1",
"3.21.0+dfsg-1build1"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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},
{
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"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-2026-25731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "5.37.0+dfsg-1build1"
},
{
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"binary_version": "5.37.0+dfsg-1build1"
}
]
}
},
{
"ranges": [
{
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"events": [
{
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}
]
}
],
"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",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "calibre",
"binary_version": "7.6.0+ds-1build1"
},
{
"binary_name": "calibre-bin",
"binary_version": "7.6.0+ds-1build1"
}
]
}
},
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},
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},
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{
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},
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},
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},
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],
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}
],
"modified": "2026-10-17T12:56:12.753664062Z",
"provider": "osv",
"upstream": [
"CVE-2026-25731"
],
"references": [
"https://ubuntu.com/security/CVE-2026-25731",
"https://www.cve.org/CVERecord?id=CVE-2026-25731",
"https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379",
"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc"
]
},
"related_cves": [
{
"value": "CVE-2026-25731",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354956,
"published_at": "2026-02-06T21:16:00+00:00"
}