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TI-2025-04732 Aliases CVE-2025-5268GHSA-m885-h2wc-h2w3

Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11

Priority LOW 38CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-119 and the CVSS impact.

Summary

Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0051 43rd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 128.11, 139Thunderbird (Mozilla): 128.11, 139Red Hat: 21 advisoriesRed Hat: 14 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—128.11, 139Patch availableCNA
MozillaThunderbird—128.11, 139Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 128.11, 139 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 128.11, 139 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 128.11.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 139.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 128.11.0; 129.0 to before 139.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 128.11.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 139.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 128.11.0; 129.0 to before 139.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 128.11, 139
  • Fix · CNA Thunderbird (Mozilla) Fixed in 128.11, 139

Red Hat 21 advisories

  • RHSA-2025:9155 Released 2025-06-17 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-128.11.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-128.11.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-128.11.0-1.el8_6
  • RHSA-2025:9072 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-128.11.0-1.el9_4, firefox-x11-128.11.0-1.el9_4
  • RHSA-2025:9071 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-128.11.0-1.el9_2, firefox-x11-128.11.0-1.el9_2
Show 18 more Red Hat advisories
  • RHSA-2025:9077 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-128.11.0-1.el8_8
  • RHSA-2025:9074 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-128.11.0-1.el7_9
  • RHSA-2025:9073 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-128.11.0-1.el9_0
  • RHSA-2025:9076 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-128.11.0-1.el8_4
  • RHSA-2025:9075 Released 2025-06-16 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-128.11.0-1.el8_2
  • RHSA-2025:8756 Released 2025-06-10 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-128.11.0-1.el8_10
  • RHSA-2025:8642 Released 2025-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-128.11.0-1.el9_2
  • RHSA-2025:8631 Released 2025-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-128.11.0-1.el8_2
  • RHSA-2025:8630 Released 2025-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-128.11.0-1.el8_4
  • RHSA-2025:8629 Released 2025-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-128.11.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-128.11.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-128.11.0-1.el8_6
  • RHSA-2025:8628 Released 2025-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-128.11.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-128.11.0-1.el8_8
  • RHSA-2025:8607 Released 2025-06-05 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-128.11.0-1.el9_6
  • RHSA-2025:8608 Released 2025-06-05 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-128.11.0-1.el10_0
  • RHSA-2025:8599 Released 2025-06-05 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-128.11.0-1.el9_4
  • RHSA-2025:8598 Released 2025-06-05 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-128.11.0-1.el9_0
  • RHSA-2025:8341 Released 2025-06-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-128.11.0-1.el10_0
  • RHSA-2025:8308 Released 2025-05-29 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-128.11.0-1.el8_10
  • RHSA-2025:8293 Released 2025-05-29 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-128.11.0-1.el9_6, firefox-x11-128.11.0-1.el9_6

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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-2025:8341, RHSA-2025:8608
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:8308, RHSA-2025:8756
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:8293, RHSA-2025:8607
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:8631, RHSA-2025:9075
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:8630, RHSA-2025:9076
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:8629, RHSA-2025:9155
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:8629, RHSA-2025:9155
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2025:8628, RHSA-2025:9077
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:8598, RHSA-2025:9073
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:8642, RHSA-2025:9071
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:8599, RHSA-2025:9072
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:8629, RHSA-2025:9155
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2025:8628
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2025:9074

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-5268
  2. 2026-10-03 Alias added: GHSA-m885-h2wc-h2w3

References

Advisory 4

Other 1

  • 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