CVE-2025-10532
Incorrect boundary conditions in the JavaScript: GC component
MEDIUM
6.5
CVSS Score
Published: September 16, 2025 at 12:26 PM UTC
Updated: October 23, 2026 at 11:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
All versionsv < 140.3.0v < 143.0
Vendor states this is fixed in 140.3 (unaffected)
Vendor states this is fixed in 143 (unaffected)
All versionsv < 140.3.0141.0 ≤ v < 143.0
Vendor states this is fixed in 140.3 (unaffected)
Vendor states this is fixed in 143 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (7)
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/09/msg00020.htmlSource: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/09/msg00026.htmlSSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
6.5MEDIUMCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-754
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