What’s Vulnerable › Vulnerabilities
CVE-2026-63274: Heap buffer overflow in PDF import stream handling
- Severity: medium (CVSS 5.4 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-22 · updated 2026-09-22
- Weakness: CWE-125
Description
LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing a stream object. The length of the stream was taken from the object's own dictionary and was not checked against the number of bytes actually present, so copying the stream read and wrote past the end of the buffer holding it. In fixed versions the declared length is clamped to the bytes actually read.
Affected products
- The Document Foundation LibreOffice: from 26.2 before < 26.2.5 — fixed in < 26.2.5
How to fix
Upgrade to a fixed version: The Document Foundation LibreOffice < 26.2.5. Check the vendor advisory for mitigations.
In the news
References
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