Sandbox escape due to uninitialized memory in the DOM: Web Serial component
Mozilla · Firefox
The flaw is an uninitialized-memory bug in the DOM: Web Serial component of Mozilla Firefox, which allows a sandbox escape. An attacker who can get a user to interact with malicious web content can exploit it over the network without authentication to break out of the browser sandbox, with the attack vector indicating user interaction is required and no privileges are needed.
Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- Exploited
- Not confirmed
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Disclosed on 13 Oct 2026. No public exploit code or confirmed exploitation is recorded.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Not named in any threat report yetAlso mentioned in 9 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Known_Cve | Oct 22, 2026 | Part 1/421 Oct 2026
- Known_Cve | Oct 21, 2026 | Part 2/420 Oct 2026
- Known_Cve | Oct 20, 2026 | Part 2/419 Oct 2026
- Known_Cve | Oct 19, 2026 | Part 2/418 Oct 2026
- Known_Cve | Oct 18, 2026 | Part 2/417 Oct 2026
- Known_Cve | Oct 17, 2026 | Part 2/416 Oct 2026
- 3 more on OTX