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TI-2025-00854 Aliases CVE-2025-1012GHSA-hjjx-mmjm-vp9r

Use-after-free during concurrent delazification

Priority MEDIUM 49CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00452 39th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 115.20, 128.7, 135Thunderbird (Mozilla): 128.7, 135Red Hat: 19 advisoriesRed Hat: 14 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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—115.20, 128.7, 135Patch availableCNA
MozillaThunderbird—128.7, 135Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 115.20, 128.7, 135 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 128.7, 135 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 115.20.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 135.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*128.1.0 to before 128.7.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*before 135.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*128.0.1 to before 128.7.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 115.20.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 135.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions 128.1.0 to before 128.7.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions before 135.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions 128.0.1 to before 128.7.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 115.20, 128.7, 135
  • Fix · CNA Thunderbird (Mozilla) Fixed in 128.7, 135

Red Hat 19 advisories

  • RHSA-2025:1348 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-128.7.0-1.el8_2
  • RHSA-2025:1341 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-128.7.0-1.el8_6
  • RHSA-2025:1340 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) thunderbird-128.7.0-1.el8_8
Show 16 more Red Hat advisories
  • RHSA-2025:1339 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird-128.7.0-1.el8_4
  • RHSA-2025:1318 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-128.7.0-1.el9_4
  • RHSA-2025:1317 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) thunderbird-128.7.0-1.el9_2
  • RHSA-2025:1319 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-128.7.0-1.el9_0
  • RHSA-2025:1292 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-128.7.0-1.el8_10
  • RHSA-2025:1283 Released 2025-02-11 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-128.7.0-1.el8_10
  • RHSA-2025:1184 Released 2025-02-10 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-128.7.0-1.el9_5
  • RHSA-2025:1140 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-128.7.0-1.el9_4, firefox-x11-128.7.0-1.el9_4
  • RHSA-2025:1139 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox-128.7.0-1.el9_2, firefox-x11-128.7.0-1.el9_2
  • RHSA-2025:1137 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox-128.7.0-1.el8_8
  • RHSA-2025:1132 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-128.7.0-1.el7_9
  • RHSA-2025:1136 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-128.7.0-1.el8_6
  • RHSA-2025:1138 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-128.7.0-1.el9_0
  • RHSA-2025:1135 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox-128.7.0-1.el8_4
  • RHSA-2025:1133 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-128.7.0-1.el8_2
  • RHSA-2025:1066 Released 2025-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-128.7.0-1.el9_5, firefox-x11-128.7.0-1.el9_5

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 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:1283, RHSA-2025:1292
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:1066, RHSA-2025:1184
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:1133, RHSA-2025:1348
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux AppStream E4S (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:1138, RHSA-2025:1319
Red Hat Enterprise Linux AppStream EUS (v.8.8)Fixed RHSA-2025:1137, RHSA-2025:1340
Red Hat Enterprise Linux AppStream EUS (v.9.2)Fixed RHSA-2025:1139, RHSA-2025:1317
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:1140, RHSA-2025:1318
Red Hat Enterprise Linux AppStream TUS (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2025:1132

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-1012
  2. 2026-10-03 Alias added: GHSA-hjjx-mmjm-vp9r

References

Advisory 5

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