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TI-2026-10580 Aliases CVE-2026-12307GHSA-m2jv-hf34-6g5m

Memory corruption in Mozilla Firefox

Priority LOW 30CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
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.

Summary

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00261 17th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.12, 152Thunderbird (Mozilla): 140.12, 152Red Hat: 21 advisoriesRed Hat: 14 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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—140.12, 152Patch availableCNA
MozillaThunderbird—140.12, 152Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.12, 152 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.12, 152 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.12.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 152.0.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*before 140.12.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*before 152.0.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.12.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 152.0.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions before 140.12.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions before 152.0.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.12, 152
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.12, 152

Red Hat 21 advisories

  • RHSA-2026:39706 Released 2026-07-15 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.12.0-1.el9_2
  • RHSA-2026:39428 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.12.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.12.0-1.el8_4
  • RHSA-2026:39142 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.12.0-1.el8_8
Show 18 more Red Hat advisories
  • RHSA-2026:39141 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) thunderbird-140.12.0-1.el8_6
  • RHSA-2026:39011 Released 2026-07-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox-140.12.0-1.el9_4, firefox-x11-140.12.0-1.el9_4
  • RHSA-2026:38750 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.12.0-1.el9_6
  • RHSA-2026:38753 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) thunderbird-140.12.0-1.el9_4
  • RHSA-2026:38751 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.12.0-1.el10_0
  • RHSA-2026:38506 Released 2026-07-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.12.0-1.el7_9
  • RHSA-2026:37391 Released 2026-07-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.12.0-1.el9_6, firefox-x11-140.12.0-1.el9_6
  • RHSA-2026:37210 Released 2026-07-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox-140.12.0-1.el8_6
  • RHSA-2026:36101 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.12.0-1.el9_2, firefox-x11-140.12.0-1.el9_2
  • RHSA-2026:36103 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.12.0-1.el8_8
  • RHSA-2026:36102 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.12.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.12.0-1.el8_4
  • RHSA-2026:36100 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.12.0-1.el10_0
  • RHSA-2026:33445 Released 2026-06-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.12.0-1.el8_10
  • RHSA-2026:30846 Released 2026-06-29 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.12.0-1.el10_2
  • RHSA-2026:29940 Released 2026-06-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.12.0-1.el9_8
  • RHSA-2026:27734 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.12.0-1.el9_8, firefox-x11-140.12.0-1.el9_8
  • RHSA-2026:27733 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.12.0-1.el10_2
  • RHSA-2026:27717 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.12.0-1.el8_10

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-2026:27733, RHSA-2026:30846
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:27717, RHSA-2026:33445
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:27734, RHSA-2026:29940
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:36102, RHSA-2026:39428
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:37210, RHSA-2026:39141
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:36103, RHSA-2026:39142
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:36101, RHSA-2026:39706
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:38753, RHSA-2026:39011
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:36100, RHSA-2026:38751
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:37391, RHSA-2026:38750
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:36102, RHSA-2026:39428
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:37210, RHSA-2026:39141
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:36103, RHSA-2026:39142
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:38506

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-12307
  2. 2026-10-03 Alias added: GHSA-m2jv-hf34-6g5m
  3. 2026-10-21 Title updated · CNA
  4. 2026-11-06 Fix available: RHSA-2026:27733 · Red Hat

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