CVE-2026-106271: Missing authorization in Workers in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had com

Q: How do I fix CVE-2026-106271?

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

Q: Is CVE-2026-106271 being exploited?

CVE-2026-106271 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-2026-106271 affect?

CVE-2026-106271 affects chrome. Severity is high (CVSS 8.1). Missing authorization in Workers in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

Routine

HIGH 8.1UPGRADE

CVE-2026-106271 is a high-severity flaw (CVSS 8.1) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing authorization in Workers in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-10-06
Last modified	2026-10-08

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 19:17 UTCPublished CVE record published
2026-10-08 18:03 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-2026-106271: Missing authorization 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-2026-106271?

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

Is CVE-2026-106271 being exploited?

CVE-2026-106271 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-2026-106271 affect?

CVE-2026-106271 affects chrome. Severity is high (CVSS 8.1). Missing authorization in Workers in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

How urgent is CVE-2026-106271?

Priority 32/100. High severity

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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