CVE-2026-5733: Incorrect boundary conditions in the Graphics: WebGPU component

Q: How do I fix CVE-2026-5733?

firefox: upgrade to 149.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-5733 being exploited?

CVE-2026-5733 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-5733 affect?

CVE-2026-5733 affects firefox. Severity is high (CVSS 8.8). Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

Routine

HIGH 8.8UPGRADE

CVE-2026-5733 is a high-severity flaw (CVSS 8.8) affecting firefox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 13:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 149.0.2

Fixed in: 149.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox || rpm -q firefox || firefox --version

2. UPGRADE to 149.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5733?

firefox: upgrade to 149.0.2. Exact commands for each OS are on this page.

Is CVE-2026-5733 being exploited?

CVE-2026-5733 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5733 affect?

CVE-2026-5733 affects firefox. Severity is high (CVSS 8.8). Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

How urgent is CVE-2026-5733?

Priority 37/100. High severity

Software pages

Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

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References

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