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How the CVE Works:
CVE-2025-2866 exploits LibreOffice’s improper verification of cryptographic signatures in PDF documents. The vulnerability stems from flawed validation logic in the `adbe.pkcs7.sha1` signature verification process. Attackers can craft malicious PDFs with invalid digital signatures that LibreOffice incorrectly validates as authentic. This allows spoofing signed documents, leading to trust manipulation. Versions 24.8 to 24.8.5 and 25.2 to 25.2.1 are affected due to insufficient checks in the signature-handling code.
DailyCVE Form:
Platform: LibreOffice
Version: 24.8 – 24.8.5, 25.2 – 25.2.1
Vulnerability: Signature spoofing
Severity: Critical
Date: 2025-07-03
Prediction: Patch by 2025-08-15
What Undercode Say:
Analytics:
$ pdfsig --verify malicious.pdf Bypassed in vulnerable versions $ oowriter --safe-mode Partial mitigation
Exploit:
crafted_pdf = forge_signature(original_pdf, invalid_cert) Spoofs validation
Protection from this CVE:
- Update to LibreOffice 24.8.6 / 25.2.2+
- Disable PDF signature trust by default
- Use external PDF validators
Impact:
- Document integrity compromise
- Fraudulent contract acceptance
- Trust chain bypass
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
