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Fencer Vulns
high 8.8

CVE-2026-5732 json

Incorrect boundary conditions, integer overflow in the Graphics: Text component

published 2026-04-07 7 mo ago modified 2026-10-24 15 d ago also EUVD-2026-19611

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Patch / fix

  • mozilla firefox 140.9.1, 149.0.2
  • firefox-esr Debian 12 140.9.1esr-1~deb12u1
  • firefox-esr Debian 13 140.9.1esr-1~deb13u1
  • firefox-esr Debian 14 140.9.1esr-1
  • thunderbird Debian 12 1:140.9.1esr-1~deb12u1
  • thunderbird Debian 13 1:140.9.1esr-1~deb13u1
  • thunderbird Debian 14 1:140.9.1esr-1

debian advisories DEBIAN-CVE-2026-5732

  • thunderbird RHEL 10.1 140.9.1-1.el10_1
  • thunderbird RHEL 8 140.9.1-1.el8_10
  • thunderbird RHEL 9 140.9.1-1.el9_7
  • firefox RHEL 8 140.9.1-1.el8_10
  • firefox RHEL 9 140.9.1-1.el9_7
  • firefox-x11 RHEL 9 140.9.1-1.el9_7
  • firefox RHEL 10.1 140.9.1-1.el10_1
  • thunderbird RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 140.9.1-1.el8_6

red hat advisories RHSA-2026:15889RHSA-2026:14303RHSA-2026:14223RHSA-2026:13977RHSA-2026:13922RHSA-2026:13682

  • MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 140.9.1-150200.8.266.1
  • MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 140.9.1-150200.152.228.1
  • MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 140.9.1-160000.1.1
  • MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 140.9.1-112.307.1

suse advisories SUSE-SU-2026:1379-1SUSE-SU-2026:1322-1SUSE-SU-2026:1273-1SUSE-SU-2026:21157-1

  • MozillaFirefox openSUSE Leap 16.0 140.9.1-160000.1.1
  • MozillaFirefox openSUSE Tumbleweed 149.0.2-1.1
  • MozillaThunderbird openSUSE Tumbleweed 140.9.1-1.1
  • firefox-esr openSUSE Tumbleweed 140.9.1-1.1

opensuse advisories openSUSE-SU-2026:20486-1openSUSE-SU-2026:10511-1openSUSE-SU-2026:10501-1openSUSE-SU-2026:10503-1

  • thunderbird AlmaLinux 10 140.9.1-1.el10_1.alma.1
  • thunderbird AlmaLinux 8 140.9.1-1.el8_10.alma.1
  • thunderbird AlmaLinux 9 140.9.1-1.el9_7.alma.1
  • firefox AlmaLinux 8 140.9.1-1.el8_10.alma.1
  • firefox AlmaLinux 9 140.9.1-1.el9_7.alma.1
  • firefox-x11 AlmaLinux 9 140.9.1-1.el9_7.alma.1
  • firefox AlmaLinux 10 140.9.1-1.el10_1

almalinux advisories ALSA-2026:9638ALSA-2026:9345ALSA-2026:8459ALSA-2026:8052ALSA-2026:7671ALSA-2026:7672

  • thunderbird Rocky Linux 10 140.9.1-1.el10_1
  • thunderbird Rocky Linux 8 140.9.1-1.el8_10
  • thunderbird Rocky Linux 9 140.9.1-1.el9_7
  • firefox Rocky Linux 8 140.9.1-1.el8_10
  • firefox Rocky Linux 10 140.9.1-1.el10_1
  • firefox Rocky Linux 9 140.9.1-1.el9_7

rocky linux advisories RLSA-2026:9638RLSA-2026:9345RLSA-2026:8459RLSA-2026:8052RLSA-2026:7672RLSA-2026:7671

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-2026-5732 updated cvss 8.8

firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics: Text component

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 rhel10/firefox-flatpak, rhel10/thunderbird-flatpak
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 140.9.1-1.el8_10, thunderbird 140.9.1-1.el8_10
    fixed: vendor fix RHSA-2026:8052
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 140.9.1-1.el9_7, firefox-x11 140.9.1-1.el9_7, thunderbird 140.9.1-1.el9_7
    fixed: vendor fix RHSA-2026:7671
  • Red Hat Enterprise Linux AppStream (v. 10) firefox 140.9.1-1.el10_1, thunderbird 140.9.1-1.el10_1
    fixed: vendor fix RHSA-2026:7672
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 140.9.1-1.el8_2
    fixed: vendor fix RHSA-2026:11805
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.9.1-1.el8_4, thunderbird 140.9.1-1.el8_4
    fixed: vendor fix RHSA-2026:13600
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.9.1-1.el8_6, thunderbird 140.9.1-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 140.9.1-1.el8_6, thunderbird 140.9.1-1.el8_6
    fixed: vendor fix RHSA-2026:13683
show 10 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.9.1-1.el8_8, thunderbird 140.9.1-1.el8_8
    fixed: vendor fix RHSA-2026:13682
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 140.9.1-1.el9_0, thunderbird 140.9.1-1.el9_0
    fixed: vendor fix RHSA-2026:13596
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.9.1-1.el9_2, firefox-x11 140.9.1-1.el9_2, thunderbird 140.9.1-1.el9_2
    fixed: vendor fix RHSA-2026:13922
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.9.1-1.el10_0, thunderbird 140.9.1-1.el10_0
    fixed: vendor fix RHSA-2026:13665
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox 140.9.1-1.el9_4, firefox-x11 140.9.1-1.el9_4, thunderbird 140.9.1-1.el9_4
    fixed: vendor fix RHSA-2026:13582
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.9.1-1.el9_6, firefox-x11 140.9.1-1.el9_6, thunderbird 140.9.1-1.el9_6
    fixed: vendor fix RHSA-2026:13583
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.9.1-1.el8_4, thunderbird 140.9.1-1.el8_4
    fixed: vendor fix RHSA-2026:13600
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 140.9.1-1.el8_6, thunderbird 140.9.1-1.el8_6
    fixed: vendor fix RHSA-2026:13683
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.9.1-1.el8_8, thunderbird 140.9.1-1.el8_8
    fixed: vendor fix RHSA-2026:13682
  • Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.9.1-2.el7_9
    fixed: vendor fix RHSA-2026:13977

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
7 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux Server (v. 7 ELS)
  • Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Red Hat Enterprise Linux AppStream (v. 8)
  • Red Hat Red Hat Enterprise Linux AppStream AUS (v. 8.2)
  • Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.6)
  • Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.6)
  • Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.6)
  • Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)
  • Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Red Hat Enterprise Linux AppStream (v. 9)

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.