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TI-2026-05025 Aliases CVE-2026-5732GHSA-mj57-mxq8-qvw9

Integer overflow in Mozilla Firefox

Priority MEDIUM 40CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 17 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00364 30th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.9.1, 149.0.2Thunderbird (Mozilla): 140.9.1, 149.0.2Red Hat: 24 advisoriesRed Hat: 17 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox—140.9.1, 149.0.2Patch availableCNA
MozillaThunderbird—140.9.1, 149.0.2Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.9.1, 149.0.2 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.9.1, 149.0.2 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.9.1VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 149.0.2VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.9.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 149.0.2 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.9.1, 149.0.2
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.9.1, 149.0.2

Red Hat 24 advisories

  • RHSA-2026:15889 Released 2026-05-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.9.1-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-140.9.1-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-140.9.1-1.el8_6
  • RHSA-2026:14303 Released 2026-05-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.9.1-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.9.1-1.el8_4
  • RHSA-2026:14223 Released 2026-05-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.9.1-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.9.1-1.el8_8
Show 21 more Red Hat advisories
  • RHSA-2026:13977 Released 2026-05-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.9.1-2.el7_9
  • RHSA-2026:13922 Released 2026-05-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.9.1-1.el9_2, firefox-x11-140.9.1-1.el9_2
  • RHSA-2026:13683 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.9.1-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-140.9.1-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-140.9.1-1.el8_6
  • RHSA-2026:13682 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.9.1-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.9.1-1.el8_8
  • RHSA-2026:13665 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.9.1-1.el10_0
  • RHSA-2026:13600 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.9.1-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.9.1-1.el8_4
  • RHSA-2026:13583 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.9.1-1.el9_6, firefox-x11-140.9.1-1.el9_6
  • RHSA-2026:13582 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-140.9.1-1.el9_4, firefox-x11-140.9.1-1.el9_4
  • RHSA-2026:13596 Released 2026-05-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.9.1-1.el9_0
  • RHSA-2026:13533 Released 2026-05-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-140.9.1-1.el9_4
  • RHSA-2026:13412 Released 2026-05-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.9.1-1.el9_2
  • RHSA-2026:13342 Released 2026-05-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.9.1-1.el9_6
  • RHSA-2026:12264 Released 2026-04-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-140.9.1-1.el9_0
  • RHSA-2026:11813 Released 2026-04-29 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.9.1-1.el10_0
  • RHSA-2026:11805 Released 2026-04-29 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-140.9.1-1.el8_2
  • RHSA-2026:9638 Released 2026-04-22 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.9.1-1.el10_1
  • RHSA-2026:9345 Released 2026-04-21 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.9.1-1.el8_10
  • RHSA-2026:8459 Released 2026-04-16 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.9.1-1.el9_7
  • RHSA-2026:8052 Released 2026-04-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.9.1-1.el8_10
  • RHSA-2026:7671 Released 2026-04-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.9.1-1.el9_7, firefox-x11-140.9.1-1.el9_7
  • RHSA-2026:7672 Released 2026-04-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.9.1-1.el10_1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:7672, RHSA-2026:9638
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:8052, RHSA-2026:9345
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:7671, RHSA-2026:8459
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2026:11805
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:13600, RHSA-2026:14303
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:13683, RHSA-2026:15889
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:13683, RHSA-2026:15889
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:13682, RHSA-2026:14223
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:12264, RHSA-2026:13596
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:13412, RHSA-2026:13922
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:11813, RHSA-2026:13665
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:13533, RHSA-2026:13582
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:13342, RHSA-2026:13583
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:13600, RHSA-2026:14303
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:13683, RHSA-2026:15889
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:13682, RHSA-2026:14223
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:13977

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5732
  2. 2026-10-03 Alias added: GHSA-mj57-mxq8-qvw9
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 2

Other 3

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences