CVE-2026-4430 Heap Buffer Overflow in AgileEngine
A heap buffer overflow in LibreOffice allows attackers to execute arbitrary code via crafted OOXML documents with mismatched encryption salt parameters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-4430?
CVE-2026-4430 is a medium-severity memory corruption vulnerability in Libreoffice Libreoffice, published on 7 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters.
This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.
Weakness: CWE-787
Which versions are affected by CVE-2026-4430?
It affects 1 product.
Linux distribution packages (40)
autocorr-af AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-bg AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ca AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-cs AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-da AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-de AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-en AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-es AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-fa AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-fi AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-fr AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ga AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-hr AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-hu AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-is AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-it AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ja AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ko AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-lb AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-lt AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-mn AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-nl AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-pl AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-pt AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ro AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-ru AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-sk AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-sl AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-sr AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-sv AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-tr AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-vi AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
autocorr-zh AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-base AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-calc AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-core AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-data AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-draw AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
libreoffice-emailmerge AlmaLinux:8 | All versions | 1:6.4.7.2-20.el8_10.alma.1 |
Products include Libreoffice Libreoffice.
How do I fix CVE-2026-4430?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4430 being exploited?
There is no known exploitation of CVE-2026-4430 in the wild and no public exploit code.
Other vulnerabilities in Libreoffice Libreoffice
Sources
Also known as ALSA-2026:28290, ALSA-2026:28922, DEBIAN-CVE-2026-4430, ECHO-c13c-f4b9-2ece, GHSA-cwgp-8p97-cf77, MGASA-2026-0141 and 13 more.