SB2026061753 - Debian update for libreoffice
Published: June 17, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-6039)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in DXF polyline import when parsing a crafted DXF file. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
The issue occurs when a polyline point count exceeds the 16-bit range, causing the buffer to be sized using a truncated value while writes use the full count.
2) Use-after-free (CVE-ID: CVE-2026-6040)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in ODF number-format blank-width parsing when importing a crafted ODF document. A remote attacker can trick the victim into opening a crafted file to cause a denial of service.
The issue occurs when processing number format data that pads a number with blank space as wide as a chosen character.
3) Heap-based buffer overflow (CVE-ID: CVE-2026-6045)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in EMF+ gradient brush import when parsing a crafted document. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
User interaction is required to open a crafted file.
4) Stack-based buffer overflow (CVE-ID: CVE-2026-8356)
CWE-ID: CWE-121 - Stack-based buffer overflow
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to stack-based buffer overflow in PPT presentation import when parsing a crafted colour-replacement record. A remote attacker can trick the victim into opening a crafted presentation file to execute arbitrary code.
User interaction is required to open a crafted file.
5) Heap-based buffer overflow (CVE-ID: CVE-2026-8357)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in Calc formula compilation when parsing a specially crafted document containing a very long formula with many opening tokens. A remote attacker can trick the victim into opening a crafted document to execute arbitrary code.
User interaction is required to open a crafted document.
6) Heap-based buffer overflow (CVE-ID: CVE-2026-8358)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in spreadsheet tracked-changes importer when parsing a crafted spreadsheet document with reused change identifiers. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
User interaction is required to open a crafted spreadsheet document.
Remediation
Install update from vendor's website.