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CVE-2026-63278— Package URLs can be used to exfiltrate arbitrary INI file values and environment variables

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.

URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive information could be exfiltrated to a remote server on opening a document containing such links. The check added for CVE-2024-12426 did not recognise eve

CVSS 6.7 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Document Foundation LibreOffice 26.2< < 26.2.5 affected
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I. Basic Information for CVE-2026-63278

Vulnerability Information

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Vulnerability Title
Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
Source: CVE Program / CVE List V5
Vulnerability Description
URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive information could be exfiltrated to a remote server on opening a document containing such links. The check added for CVE-2024-12426 did not recognise every way of naming the package content provider, so a URL that named it differently still reached the expansion. In fixed versions the package content provider is matched when the URL is checked.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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-2026-63278

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III. Intelligence Information for CVE-2026-63278

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Other References for CVE-2026-63278 (1)

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

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-2026-63274 5.4 MEDIUM Heap buffer overflow in PDF import stream handling
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-200

V. Comments for CVE-2026-63278

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