High
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
Type: advisorySources: OSV
calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-53511
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 04:43 UTC · Revision 1
Source evidence
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
core-osv · Original sourcePublished 7 Jul 2026, 20:46 UTC
calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.
osv:CVE-2026-53511
Complete source record
{
"id": "a0cfb9afdadc0ba8ec0ee9e347769a8dcb40f232c8fa2e142cb5a22bd4788b21",
"url": "https://osv.dev/vulnerability/CVE-2026-53511",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "calibre: Arbitrary Code Execution in Template Formatter via Book Metadata",
"summary": "calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.",
"evidence": "osv:CVE-2026-53511",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-53511",
"aliases": [
"CVE-2026-53511",
"GHSA-2j4m-2q7x-2c47"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/kovidgoyal/calibre",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "d90f85753312d9c5fbd22ff687b83839282fc393"
},
{
"fixed": "712f4e1ff5c1e798c335bef3bacc4efdee052e9c"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "9.10.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "712f4e1ff5c1e798c335bef3bacc4efdee052e9c"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "d90f85753312d9c5fbd22ff687b83839282fc393"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v9.10.0"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53511.json"
}
}
],
"modified": "2026-10-28T02:30:25.804402829Z",
"provider": "osv",
"references": [
"https://github.com/kovidgoyal/calibre/releases/tag/v9.10.0",
"https://lists.debian.org/debian-lts-announce/2026/08/msg00034.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53511.json",
"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-2j4m-2q7x-2c47",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53511",
"https://github.com/kovidgoyal/calibre/commit/712f4e1ff5c1e798c335bef3bacc4efdee052e9c"
],
"provider_metadata": {
"cwe_ids": [
"CWE-94"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53511.json"
}
},
"related_cves": [
{
"value": "CVE-2026-53511",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492548,
"published_at": "2026-07-07T20:46:49.199+00:00"
}