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No exploitation reportedFix available

CVE-2026-26064

No exploitation reported by the sources we read.

  • Published2026-02-20
  • Fixed in9.3.0
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

Timeline

dates in UTC
  1. 2026-02-2002:16CVE publishedNVD

Versions per branch

NVD
Calibre-ebook calibre
BranchAffectedFixed in
9.3< 9.3.09.3.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • kovidgoyal calibre
    Affected
    • = < 9.3.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-20

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • calibreUbuntu:26.10all versions · no fixed version listed
  • calibreUbuntu:26.04:LTSall versions · no fixed version listed
  • calibreUbuntu:25.10all versions · no fixed version listed
  • calibreUbuntu:24.04:LTSall versions · no fixed version listed
  • calibreUbuntu:22.04:LTSall versions · no fixed version listed
  • calibreUbuntu:20.04:LTSall versions · no fixed version listed
  • calibreUbuntu:18.04:LTSall versions · no fixed version listed
  • calibreUbuntu:16.04:LTSall versions · no fixed version listed

4 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-26064 Red Hat Product Security

    calibre: Calibre: Remote Code Execution via Path Traversal

Full record on NVD

Fix

  1. Update Calibre-ebook calibre to 9.3.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-02-20
  • CNACVSS 4.09.3known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • CNAweakness (CWE)CWE-22known since 2026-10-23
  • FIRST EPSSEPSS score1.0 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-02-20
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-26064?

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

Is CVE-2026-26064 actively exploited?

Active exploitation of CVE-2026-26064 has not been confirmed. Its EPSS score was 1.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-26064?

CVE-2026-26064 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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