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TI-2025-09632 Aliases CVE-2025-10527GHSA-5vxr-wr7m-x3p3

Use after free in Mozilla Firefox

Priority LOW 31CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 15 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0029 21st percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.3, 143Thunderbird (Mozilla): 140.3, 143Red Hat: 21 advisoriesRed Hat: 15 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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—140.3, 143Patch availableCNA
MozillaThunderbird—140.3, 143Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.3, 143 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.3, 143 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.3.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*up to 143.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 140.3.0; 141.0 to before 143.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.3.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions up to 143.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 140.3.0; 141.0 to before 143.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.3, 143
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.3, 143

Red Hat 21 advisories

  • RHSA-2025:17453 Released 2025-10-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.3.0-1.el7_9
  • RHSA-2025:17378 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-140.3.0-1.el9_4, firefox-x11-140.3.0-1.el9_4
  • RHSA-2025:17374 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.3.0-1.el9_2, firefox-x11-140.3.0-1.el9_2
Show 18 more Red Hat advisories
  • RHSA-2025:17373 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.3.0-1.el9_0
  • RHSA-2025:17371 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.3.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.3.0-1.el8_4
  • RHSA-2025:17372 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-140.3.0-1.el8_2
  • RHSA-2025:17367 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.3.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-140.3.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-140.3.0-1.el8_6
  • RHSA-2025:17368 Released 2025-10-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.3.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.3.0-1.el8_8
  • RHSA-2025:17346 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-140.3.0-1.el9_4
  • RHSA-2025:17345 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.3.0-1.el9_2
  • RHSA-2025:17343 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.3.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.3.0-1.el8_8
  • RHSA-2025:17344 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-140.3.0-1.el9_0
  • RHSA-2025:17342 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.3.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-140.3.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-140.3.0-1.el8_6
  • RHSA-2025:17340 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-140.3.0-1.el8_2
  • RHSA-2025:17341 Released 2025-10-06 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.3.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.3.0-1.el8_4
  • RHSA-2025:16589 Released 2025-09-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.3.0-1.el8_10
  • RHSA-2025:16260 Released 2025-09-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.3.0-1.el8_10
  • RHSA-2025:16157 Released 2025-09-18 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.3.0-1.el10_0
  • RHSA-2025:16156 Released 2025-09-18 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.3.0-1.el9_6
  • RHSA-2025:16108 Released 2025-09-17 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.3.0-1.el9_6, firefox-x11-140.3.0-1.el9_6
  • RHSA-2025:16109 Released 2025-09-17 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.3.0-1.el10_0

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-2025:16109, RHSA-2025:16157
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:16260, RHSA-2025:16589
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:16108, RHSA-2025:16156
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:17340, RHSA-2025:17372
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:17341, RHSA-2025:17371
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:17342, RHSA-2025:17367
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:17342, RHSA-2025:17367
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2025:17343, RHSA-2025:17368
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:17344, RHSA-2025:17373
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:17345, RHSA-2025:17374
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:17346, RHSA-2025:17378
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2025:17341, RHSA-2025:17371
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:17342, RHSA-2025:17367
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2025:17343, RHSA-2025:17368
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2025:17453

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-10527
  2. 2026-10-03 Alias added: GHSA-5vxr-wr7m-x3p3

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