SB2026022018 - Multiple vulnerabilities in Calibre

Description

This security bulletin contains information about 2 vulnerabilities.

1) Path traversal (CVE-ID: CVE-2026-26064)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences within ODT reader. A remote attacker can write arbitrary files on the system, leading to arbitrary code execution.

2) Path traversal (CVE-ID: CVE-2026-26065)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences eReader PDB readers. A remote attacker can write arbitrary files on the system, leading to arbitrary code execution.

Remediation

Install update from vendor's website.

References

• https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmp
• https://github.com/kovidgoyal/calibre/security/advisories/GHSA-vmfh-7mr7-pp2w