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Fencer Vulns
high 8.5

CVE-2026-63277 json

RCE via calcext:data-mappings, sql provider and jdbc connector

published 2026-10-05 35 d ago modified 2026-10-06 33 d ago also EUVD-2026-92416

cvss
8.5
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. A document could name a Java database driver for such a link to be loaded from a remote location, so opening the document could run Java code from that location. In fixed versions an entry in a Java class path has to be a file URL.

Patch / fix

  • The Document Foundation LibreOffice < 26.2.5
  • libreoffice Debian 13 4:25.2.3-2+deb13u8
  • libreoffice Debian 14 4:26.2.5.2-1

debian advisories DEBIAN-CVE-2026-63277

  • libreoffice RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-af RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-bg RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-ca RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-cs RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-da RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-de RHEL 9 1:7.1.8.1-15.el9_8.3
  • autocorr-el RHEL 9 1:7.1.8.1-15.el9_8.3

red hat advisories RHSA-2026:82013

  • sac AlmaLinux 8 1.3-29.el8_10
  • flute AlmaLinux 8 1.3.0-19.OOo31.el8_10
  • libbase AlmaLinux 8 1.1.3-21.el8_10
  • libfonts AlmaLinux 8 1.1.3-23.el8_10
  • liblayout AlmaLinux 8 0.2.10-19.el8_10
  • libloader AlmaLinux 8 1.1.3-19.el8_10
  • libformula AlmaLinux 8 1.1.3-20.el8_10
  • autocorr-af AlmaLinux 8 1:7.1.8.1-3.el8_10.alma.1

almalinux advisories ALSA-2026:88164ALSA-2026:82013

  • flute Rocky Linux 8 1.3.0-19.OOo31.el8_10
  • libbase Rocky Linux 8 1.1.3-21.el8_10
  • libfonts Rocky Linux 8 1.1.3-23.el8_10
  • liblayout Rocky Linux 8 0.2.10-19.el8_10
  • libloader Rocky Linux 8 1.1.3-19.el8_10
  • libformula Rocky Linux 8 1.1.3-20.el8_10
  • libreoffice Rocky Linux 8 1:7.1.8.1-3.el8_10
  • librepository Rocky Linux 8 1.1.3-19.el8_10

rocky linux advisories RLSA-2026:88164RLSA-2026:82013

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-63277 updated cvss 7.8

libreoffice: libreoffice: Arbitrary code execution via remote Java database driver

  • Red Hat Enterprise Linux 7 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +105 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) sac 1.3-29.el8_10, libbase 1.1.3-21.el8_10, libfonts 1.1.3-23.el8_10, libloader 1.1.3-19.el8_10, libformula 1.1.3-20.el8_10, liblayout 0.2.10-19.el8_10, +107 more
    fixed: vendor fix RHSA-2026:88164
  • Red Hat Enterprise Linux AppStream (v. 9) autocorr-af 7.1.8.1-15.el9_8.3, autocorr-bg 7.1.8.1-15.el9_8.3, autocorr-ca 7.1.8.1-15.el9_8.3, autocorr-cs 7.1.8.1-15.el9_8.3, autocorr-da 7.1.8.1-15.el9_8.3, autocorr-de 7.1.8.1-15.el9_8.3, +100 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libreoffice-sdk 7.1.8.1-15.el9_8.3
    fixed: vendor fix RHSA-2026:82013
  • Red Hat Enterprise Linux CRB (v. 8) libreoffice-sdk 7.1.8.1-3.el8_10
    fixed: vendor fix RHSA-2026:88164
  • Red Hat Enterprise Linux 6 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +60 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
34 d ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • The Document Foundation LibreOffice

Classification

Weakness
  • CWE-829 Inclusion of Functionality from Untrusted Control Sphere

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.