CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability

Q: How do I fix CVE-2026-87491?

chrome: upgrade to 153.0.8010.36. Exact commands for each OS are on this page.

Q: Is CVE-2026-87491 being exploited?

Yes. CVE-2026-87491 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2026-87491 affect?

CVE-2026-87491 affects chrome. Severity is high (CVSS 8.8). Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Q: How urgent is CVE-2026-87491?

Priority 83/100. High severity; Exploited in the wild (CISA KEV); Public exploit reference

Patch now

HIGH 8.8EXPLOITEDUPGRADE

CVE-2026-87491 is a high-severity flaw (CVSS 8.8) affecting chrome, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Why this priority

High severity
Exploited in the wild (CISA KEV)
Public exploit reference

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	3.1% (top 12%)
CISA exploited list	Yes, fix due 2026-09-23
Weakness	CWE-787
Published	2026-09-09
Last modified	2026-09-21

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-09-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-09-09 01:17 UTCPublished CVE record published
2026-09-21 13:17 UTCUpdated Record last modified
2026-09-23Deadline CISA due date for US federal agencies to patch

google chrome UPGRADE

Affected: < 153.0.8010.36

Fixed in: 153.0.8010.36

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 153.0.8010.36 (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.

Exact fixes by distribution

Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source

sudo dnf upgrade --advisory=FEDORA-2026-0602a84203

Ubuntu 22.04 · chromium-browser · NOT AFFECTED

Ubuntu 24.04 · chromium-browser · NOT AFFECTED

Debian 12 · chromium · FIXED · 153.0.8010.52-1~deb12u1

sudo apt update && sudo apt install --only-upgrade chromium dpkg --compare-versions "$(dpkg-query -W -f='${Version}' chromium)" ge "153.0.8010.52-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · chromium · FIXED · 153.0.8010.47-2~deb13u1

sudo apt update && sudo apt install --only-upgrade chromium dpkg --compare-versions "$(dpkg-query -W -f='${Version}' chromium)" ge "153.0.8010.47-2~deb13u1" && echo PATCHED || echo STILL-VULNERABLE

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: SneakyNachos/CVE-2026-87491-and-CVE-2026-85046-the-bagel-fell-off-the-counter (5 stars)
Write-up: issues.chromium.org/issues/543557673

Verify at the official source NVD · CVE Program · CISA KEV catalog · 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-2026-87491?

chrome: upgrade to 153.0.8010.36. Exact commands for each OS are on this page.

Is CVE-2026-87491 being exploited?

Yes. CVE-2026-87491 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-87491 affect?

CVE-2026-87491 affects chrome. Severity is high (CVSS 8.8). Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

How urgent is CVE-2026-87491?

Priority 83/100. High severity; Exploited in the wild (CISA KEV); Public exploit reference

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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