Description
Improper Verification of Cryptographic Signature vulnerability in LibreOffice allows PDF Signature Spoofing by Improper Validation.
In the affected versions of LibreOffice a flaw in the verification code for adbe.pkcs7.sha1 signatures could cause invalid signatures to be accepted as valid
This issue affects LibreOffice: from 24.8 before < 24.8.6, from 25.2 before < 25.2.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Document Foundation | LibreOffice | 24.8 – < < 24.8.6, 25.2 – < < 25.2.2 | < 24.8.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libreoffice | 4:25.2.2-1 | — |
| Debian 13 | libreoffice | 4:25.2.2-1 | — |
| Debian 12 | libreoffice | 4:7.4.7-1+deb12u8 | DSA-5908-1 |
| Debian 11 | libreoffice | 1:7.0.4-4+deb11u13 | DLA-4205-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | libreoffice | 4:24.2.7-0ubuntu0.24.04.4 | USN-7504-1 |
| Ubuntu 22.04 LTS | libreoffice | 1:7.3.7-0ubuntu0.22.04.10 | USN-7504-1 |
| Ubuntu 20.04 LTS | libreoffice | 1:6.4.7-0ubuntu0.20.04.15 | USN-7504-1 |
Advisories 4
- USN-7504-1 libreoffice vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5908-1 libreoffice - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4205-1 libreoffice - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-0891 LibreOffice: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Jun 1, 2025