Vulnary
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Critical· 9.8official fix available

CVE-2026-16350

A flaw in the cubeb audio/video component lets attackers exploit incorrect boundary checks, potentially causing data loss, corruption, or denial of service.

publishedJul 21, 2026
last modifiedJul 24, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
33th 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 22, 2026

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

01

Who is affected

Firefox (versions before 153, ESR 115.38, ESR 140.13) and Thunderbird (versions before 153, ESR 140.13) on any platform.

02

Real-world impact

An attacker could read, modify, or delete data, or crash the application, leading to loss of information, data integrity, or service availability.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw can be exploited remotely without authentication, with no user interaction, and can fully compromise confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Firefox to version 153 or later, or to ESR 115.38 or later.
  2. 02Upgrade Thunderbird to version 153 or later, or to ESR 140.13 or later.
  3. 03Restart the browsers after the update.

NVD-referenced vendor advisory

05

Timeline

  1. Jul 21, 2026 · 12d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 23, 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 impactHigh
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 →
CVE-2026-16350: A flaw in the cubeb audio/video component lets attackers exploit incor · Vulnary