CVE-2026-85899: Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a n

Q: How do I fix CVE-2026-85899?

edge chromium: upgrade to 155.0.4283.45. Exact commands for each OS are on this page.

Q: Is CVE-2026-85899 being exploited?

CVE-2026-85899 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-2026-85899 affect?

CVE-2026-85899 affects edge chromium. Severity is high (CVSS 8.1). Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network.

Q: How urgent is CVE-2026-85899?

Priority 46/100. High severity; On your watchlist

This month

HIGH 8.1WATCHLISTUPGRADE

CVE-2026-85899 is a high-severity flaw (CVSS 8.1) affecting edge chromium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network.

Why this priority

High severity
On your watchlist

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	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-10-29
Last modified	2026-11-03

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-29 16:19 UTCPublished CVE record published
2026-11-03 17:56 UTCUpdated Record last modified

microsoft edge chromium UPGRADE

Affected: < 155.0.4283.45

Fixed in: 155.0.4283.45

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy edge-chromium || rpm -q edge-chromium || edge-chromium --version

2. UPGRADE to 155.0.4283.45 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade edge-chromium

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade edge-chromium

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-2026-85899 | Microsoft Edge up to 154.0.4258.37 use after free 2026-10-29

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-2026-85899?

edge chromium: upgrade to 155.0.4283.45. Exact commands for each OS are on this page.

Is CVE-2026-85899 being exploited?

CVE-2026-85899 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-2026-85899 affect?

CVE-2026-85899 affects edge chromium. Severity is high (CVSS 8.1). Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network.

How urgent is CVE-2026-85899?

Priority 46/100. High severity; On your watchlist

Software pages

Microsoft Edge vulnerabilities · Chromium vulnerabilities

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References

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