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Vulnerability details: VCID-zhz3-1799-a7hk
Vulnerability ID VCID-zhz3-1799-a7hk
Aliases CVE-2026-25731
Summary calibre: Calibre: Arbitrary Code Execution via malicious custom template file during ebook conversion
Status Published
Exploitability 0.5
Weighted Severity 7.0
Risk 3.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
System Score Found at
cvssv3 7.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25731.json
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25731
cvssv3.1 7.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 7.8 https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379
ssvc Track* https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379
cvssv3.1 7.8 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
ssvc Track* https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25731.json
https://api.first.org/data/v1/epss?cve=CVE-2026-25731
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-25731
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2437917 https://bugzilla.redhat.com/show_bug.cgi?id=2437917
f0649b27512e987b95fcab2e1e0a3bcdafc23379 https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379
GHSA-xrh9-w7qx-3gcc https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25731.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-02-06T21:01:31Z/ Found at https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-02-06T21:01:31Z/ Found at https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
Exploit Prediction Scoring System (EPSS)
Percentile 0.00905
EPSS Score 9e-05
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:31:32.921489+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25731.json 38.0.0