CVE-2026-58289: Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an una

Q: How do I fix CVE-2026-58289?

edge chromium: upgrade to 150.0.4078.48. Exact commands for each OS are on this page.

Q: Is CVE-2026-58289 being exploited?

CVE-2026-58289 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-2026-58289 affect?

CVE-2026-58289 affects edge chromium. Severity is critical (CVSS 9.0). Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Q: How urgent is CVE-2026-58289?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.0REMOTEWATCHLISTUPGRADE

CVE-2026-58289 is a critical-severity flaw (CVSS 9.0) affecting edge chromium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-843
Published	2026-07-03
Last modified	2026-10-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-03 21:17 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

microsoft edge chromium UPGRADE

Affected: < 150.0.4078.48

Fixed in: 150.0.4078.48

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 150.0.4078.48 (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.

Exact fixes by distribution

Fedora ELN · nginx-mod-headers-more · FIXED · 0.41-1.eln159 · FEDORA-2026-31f55f396a · source

sudo dnf upgrade --advisory=FEDORA-2026-31f55f396a

Fedora 46 · erlang-hex_core · FIXED · 0.21.1-1.fc46 · FEDORA-2026-f3389199ff · source

sudo dnf upgrade --advisory=FEDORA-2026-f3389199ff

Public exploits and detection

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

Exploit-DB: Microsoft Edge 150.0.4078.48 - RCE

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-2026-58289?

edge chromium: upgrade to 150.0.4078.48. Exact commands for each OS are on this page.

Is CVE-2026-58289 being exploited?

CVE-2026-58289 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-2026-58289 affect?

CVE-2026-58289 affects edge chromium. Severity is critical (CVSS 9.0). Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-58289?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Microsoft Edge vulnerabilities · Chromium vulnerabilities

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References

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