CVE-2026-106420: Incorrect calculation in API in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker l

Q: How do I fix CVE-2026-106420?

chrome: upgrade to 155.0.8059.39. Exact commands for each OS are on this page.

Q: Is CVE-2026-106420 being exploited?

CVE-2026-106420 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-2026-106420 affect?

CVE-2026-106420 affects chrome. Severity is medium (CVSS 5.4). Incorrect calculation in API in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted Chrome extension. (Chromium security severity: Medium)

Q: How urgent is CVE-2026-106420?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-106420 is a medium-severity flaw (CVSS 5.4) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect calculation in API in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted Chrome extension. (Chromium security severity: Medium)

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-682
Published	2026-10-06
Last modified	2026-10-07

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 19:18 UTCPublished CVE record published
2026-10-07 13:10 UTCUpdated Record last modified

google chrome UPGRADE

Affected: < 155.0.8059.39

Fixed in: 155.0.8059.39

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 155.0.8059.39 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chrome

Note

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

Advisories and coverage

Official advisories

Microsoft MSRC Update Guide: Chromium CVE-2026-106420: Incorrect calculation 2026-10-16

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-2026-106420?

chrome: upgrade to 155.0.8059.39. Exact commands for each OS are on this page.

Is CVE-2026-106420 being exploited?

CVE-2026-106420 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-2026-106420 affect?

CVE-2026-106420 affects chrome. Severity is medium (CVSS 5.4). Incorrect calculation in API in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted Chrome extension. (Chromium security severity: Medium)

How urgent is CVE-2026-106420?

Priority 21/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities · Google Chrome vulnerabilities · Chromium vulnerabilities

Related CVEs

CVE-2026-6296 CRITICAL 9.6 UPGRADE Heap buffer overflow in ANGLE in Google Chrome prior to 147.0.7727.101 allowed a remote attacker to potentiall
CVE-2026-5272 HIGH 8.8 UPGRADE Heap buffer overflow in GPU in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to execute arbi
CVE-2026-5287 HIGH 8.8 UPGRADE Use after free in PDF in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to execute arbitrary
CVE-2026-5289 CRITICAL 9.6 UPGRADE Use after free in Navigation in Google Chrome prior to 146.0.7680.178 allowed a remote attacker who had compro
CVE-2026-5274 HIGH 8.8 UPGRADE Integer overflow in Codecs in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to perform arbit

References

← Back to latest CVEs