Is CVE-2026-6778 in the CISA KEV catalog?

No. CVE-2026-6778 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6778?

CVE-2026-6778 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-6778?

CVE-2026-6778 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6778?

Upgrade firefox on debian unstable to 150.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2026-6778

MEDIUM

5.3

CVSS v3

NVD

Description

Invalid pointer in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CWE-476NULL Pointer Dereference CWE-824

How to fix

Remediation Available

firefoxDebian

Fixed in:150.0-1CVE-2026-6778

DeveloperEditionWindows application

Affected:150.0Fixed in:150.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:150.0Fixed in:150.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:150.0Fixed in:150.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Vendor Advisory2

Other references1

bugzilla.mozilla.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.