Vulnary
← back to the feed
Critical· 9.1official fix available

CVE-2026-16393

CVE-2026-16393 is a critical vulnerability in the WebGPU graphics component caused by incorrect boundary conditions. It was fixed in Firefox 153 and Thunderbird 153.

publishedJul 21, 2026
last modifiedJul 24, 2026
sourcesNVD
severity · cvss
9.1
critical · how bad it is
exploitation · epss
<1%
22th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 21, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Users of Firefox or Thunderbird (no specific products listed in CPE)

02

Real-world impact

High risk due to CVSS 9.1 score (critical severity) and potential for remote code execution via boundary condition exploitation.

03

Why this severity

CVSS 9.1 (critical): High confidence in remote exploitation without user interaction, leading to full system compromise.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Firefox to version 153 or later.
  2. 02Upgrade Thunderbird to version 153 or later.

NVD description stating fix in Firefox 153/Thunderbird 153

05

Timeline

  1. Jul 21, 2026 · 12d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 22, 2026 · 10d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
  3. Jul 24, 2026 · 9d ago
    Advisory updated
    The NVD record was last revised.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactNone
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →