SB2026090258 - Heap-based buffer overflow in Calibre

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Main Vulnerability Database SB2026090258

SB2026090258 - Heap-based buffer overflow in Calibre

Published: September 2, 2026

Security Bulletin ID SB2026090258
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: N/A)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in cpalmdoc_compress() when processing crafted book content during document conversion. A remote user can supply a specially crafted document or trigger conversion of a crafted book to cause a denial of service.

PalmDoc compression is the default for MOBI and AZW3 output and unconditional for PDB. A write-authenticated content server conversion path is also affected.


Remediation

Install update from vendor's website.

References