PatchSiren cyber security CVE debrief
CVE-2026-16385 Mozilla CVE debrief
CVE-2026-16385 is an information disclosure vulnerability caused by uninitialized memory in the Graphics: WebGPU component of Firefox and Thunderbird. This vulnerability was fixed in Firefox 153 and Thunderbird 153. The vulnerability could potentially allow an attacker to access sensitive information. Users of Firefox and Thunderbird should update their browsers to the latest versions to mitigate this vulnerability. The CVE record and NVD entry provide additional context for defenders to assess and mitigate this vulnerability.
- Vendor
- Mozilla
- Product
- Firefox
- CVSS
- HIGH 7.5
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-21
- Original CVE updated
- 2026-07-22
- Advisory published
- 2026-07-21
- Advisory updated
- 2026-07-22
Who should care
Users of Firefox and Thunderbird should update their browsers to the latest versions to mitigate this vulnerability. This vulnerability could potentially allow an attacker to access sensitive information. The CVE record and NVD entry provide additional context for defenders to assess and mitigate this vulnerability. Security teams and vulnerability management teams should review the CVE record and NVD entry to assess and mitigate this vulnerability.
Technical summary
The vulnerability is caused by uninitialized memory in the Graphics: WebGPU component of Firefox and Thunderbird. This could potentially allow an attacker to access sensitive information. The vulnerability was fixed in Firefox 153 and Thunderbird 153. Users should verify their browser versions and update to the latest versions if necessary. The CVE record and NVD entry provide additional context for defenders to assess and mitigate this vulnerability.
Defensive priority
High
Recommended defensive actions
- Update Firefox to version 153 or later
- Update Thunderbird to version 153 or later
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
- Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
Evidence notes
The CVE record was published on 2026-07-21T13:17:13.660Z and was last modified on 2026-07-22T20:16:56.207Z. The NVD entry is currently Undergoing Analysis. This information disclosure vulnerability is caused by uninitialized memory in the Graphics: WebGPU component. Users should verify their browser versions and update to the latest versions if necessary. The CVE record and NVD entry provide additional context for defenders to assess and mitigate this vulnerability.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T13:17:13.660Z and has not been modified since then. The NVD entry is currently Undergoing Analysis.