A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability.…

Description

A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.

Scores

EPSS (exploitation in 30 days)

0.57% · top 52% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

• WASM type confusion involving ArrayTypes
• CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') (opens in a new tab)All about CWE-843 and its CVEs

Affected products

• Mozilla · Firefox

  • affected unspecified – < 130

• Mozilla · Firefox ESR

  • affected unspecified – < 128.2

• Mozilla · Thunderbird

  • affected unspecified – < 128.2

References (4)

• https://bugzilla.mozilla.org/show_bug.cgi?id=1911909 (opens in a new tab)
• https://www.mozilla.org/security/advisories/mfsa2024-39/ (opens in a new tab)
• https://www.mozilla.org/security/advisories/mfsa2024-40/ (opens in a new tab)
• https://www.mozilla.org/security/advisories/mfsa2024-43/ (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-8385](https://trackcve.app/badge/CVE-2024-8385.svg)](https://trackcve.app/cve/CVE-2024-8385)

Record last updated 6 Sept 2024, 18:31 UTC.