Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-63274— Heap buffer overflow in PDF import stream handling

Quick assessment

Affected
The Document Foundation LibreOffice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 strea

CVSS 5.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Document Foundation LibreOffice 26.2< < 26.2.5 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-63274

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Heap buffer overflow in PDF import stream handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS: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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Document Foundation LibreOffice 26.2 ~ < 26.2.5 -

II. Public POCs for CVE-2026-63274

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-63274

请登录查看更多情报信息。

Other References for CVE-2026-63274 (1)

Same Patch Batch · The Document Foundation · 2026-09-22 · 7 CVEs total

CVE-2026-63278 6.7 MEDIUM Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
CVE-2026-63279 5.4 MEDIUM Out of bounds read in PICT image import
CVE-2026-63272 5.4 MEDIUM Heap buffer overflow in WMF text record import
CVE-2026-63273 5.4 MEDIUM Heap buffer overflow in PDF import encryption handling
CVE-2026-63276 5.4 MEDIUM Stack buffer overflow in CFF to Type 1 font conversion
CVE-2026-63275 5.4 MEDIUM Stack buffer overflow in CFF font hint handling

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-787

V. Comments for CVE-2026-63274

No comments yet

Leave a comment