Medium
calibre — security advisory
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.
- 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-2026-27810
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:58 UTC · Revision 1
Source evidence
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.
osv:UBUNTU-CVE-2026-27810
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": "41c03eef362de46d333ceb3700848dd3ff9b881d4259737b5c13d1520610b444",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27810",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-27810",
"summary": "calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.",
"evidence": "osv:UBUNTU-CVE-2026-27810",
"products": [
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{
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{
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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"
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{
"value": "4.3.0+dfsg-2",
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{
"value": "4.4.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.0+dfsg-1",
"evidence": "/affected/2/versions"
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{
"value": "4.5.0+dfsg-2",
"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
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{
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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",
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{
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"evidence": "/affected/3/versions"
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{
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{
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{
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{
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"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
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{
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},
"ecosystem_specific": {
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{
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},
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],
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},
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},
"ecosystem_specific": {
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{
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},
{
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}
},
{
"ranges": [
{
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],
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"ecosystem": "Ubuntu:22.04:LTS"
},
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"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": {
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},
"ecosystem_specific": {
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{
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},
{
"binary_name": "calibre-bin",
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}
]
}
},
{
"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",
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],
"modified": "2026-10-17T12:59:56.505957842Z",
"provider": "osv",
"upstream": [
"CVE-2026-27810"
],
"references": [
"https://ubuntu.com/security/CVE-2026-27810",
"https://www.cve.org/CVERecord?id=CVE-2026-27810",
"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw"
]
},
"related_cves": [
{
"value": "CVE-2026-27810",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360009,
"published_at": "2026-02-27T20:21:00+00:00"
}