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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-25731", "lastModified": "2026-02-06T21:57:22.450", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-02-06T21:16:19.457", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379"}, {"source": "security-advisories@github.com", "url": "https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1336"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "calibre: Calibre: Arbitrary Code Execution via malicious custom template file during ebook conversion", "id": "2437917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2437917"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-917", "details": ["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.", "A flaw was found in Calibre, an e-book manager. This Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows an attacker to achieve arbitrary code execution. This occurs when a user converts an ebook using a specially crafted malicious custom template file, provided via the --template-html or --template-html-index command-line options. This could lead to a complete compromise of the affected system."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, users should avoid converting ebooks using untrusted or malicious custom template files with the `--template-html` or `--template-html-index` command-line options. Only use template files from trusted sources."}, "name": "CVE-2026-25731", "public_date": "2026-02-06T20:14:35Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-25731\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-25731\nhttps://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379\nhttps://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc"], "statement": "This is an IMPORTANT arbitrary code execution vulnerability in Calibre's HTML export functionality. It occurs when a user processes an ebook with a specially crafted custom template file using the `--template-html` or `--template-html-index` command-line options. This issue affects Calibre versions prior to 9.2.0, as distributed in Fedora 42 and Fedora 43.", "threat_severity": "Important"}