CVE-2026-121156: Buffer overflow in Dawn in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execu

Q: How do I fix CVE-2026-121156?

chrome: upgrade to 157.0.8103.38. Exact commands for each OS are on this page.

Q: Is CVE-2026-121156 being exploited?

CVE-2026-121156 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-2026-121156 affect?

CVE-2026-121156 affects chrome. Severity is critical (CVSS 9.6). Buffer overflow in Dawn in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

Q: How urgent is CVE-2026-121156?

Priority 43/100. Critical severity

This month

CRITICAL 9.6UPGRADE

CVE-2026-121156 is a critical-severity flaw (CVSS 9.6) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in Dawn in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-11-03
Last modified	2026-11-04

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-11-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-03 21:17 UTCPublished CVE record published
2026-11-04 14:29 UTCUpdated Record last modified

google chrome UPGRADE

Affected: < 157.0.8103.38

Fixed in: 157.0.8103.38

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 157.0.8103.38 (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

Research and news

VulDB Recent Entries: CVE-2026-121156 | Google Chrome up to 156.0.8078.79 Dawn buffer overflow 2026-11-03

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-2026-121156?

chrome: upgrade to 157.0.8103.38. Exact commands for each OS are on this page.

Is CVE-2026-121156 being exploited?

CVE-2026-121156 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-2026-121156 affect?

CVE-2026-121156 affects chrome. Severity is critical (CVSS 9.6). Buffer overflow in Dawn in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

How urgent is CVE-2026-121156?

Priority 43/100. Critical severity

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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