CVE-2026-6040

A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.

CVSS 4.0

5.4CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P

CVSS 3.1

7.3CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

CWEs

CWE-416, CWE-787, CWE-825

Published

2026-06-15

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://www.libreoffice.org/about-us/security/advisories/cve-2026-6040
• https://access.redhat.com/security/cve/CVE-2026-6040
• https://bugzilla.redhat.com/show_bug.cgi?id=2488966
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6040.json

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