CVE-2026-58599: Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code

Q: How do I fix CVE-2026-58599?

hevc video extensions: upgrade to 2.4.87.0; hevc video extensions for licensed applications: upgrade to 2.4.85.0; hevc video extensions from device manufacturer: upgrade to 2.4.86.0, 2.5.25.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-58599 being exploited?

CVE-2026-58599 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-2026-58599 affect?

CVE-2026-58599 affects hevc video extensions, hevc video extensions for licensed applications, hevc video extensions from device manufacturer. Severity is high (CVSS 7.8). Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.

Q: How urgent is CVE-2026-58599?

Priority 42/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2026-58599 is a high-severity flaw (CVSS 7.8) affecting hevc video extensions, hevc video extensions for licensed applications, hevc video extensions from device manufacturer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-08
Last modified	2026-10-01

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:17 UTCPublished CVE record published
2026-10-01 16:32 UTCUpdated Record last modified

microsoft hevc video extensions UPGRADE

Affected: < 2.4.87.0

Fixed in: 2.4.87.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hevc-video-extensions || rpm -q hevc-video-extensions || hevc-video-extensions --version

2. UPGRADE to 2.4.87.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hevc-video-extensions

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hevc-video-extensions

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

microsoft hevc video extensions for licensed applications UPGRADE

Affected: < 2.4.85.0

Fixed in: 2.4.85.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hevc-video-extensions-for-licensed-applications || rpm -q hevc-video-extensions-for-licensed-applications || hevc-video-extensions-for-licensed-applications --version

2. UPGRADE to 2.4.85.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hevc-video-extensions-for-licensed-applications

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hevc-video-extensions-for-licensed-applications

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

microsoft hevc video extensions from device manufacturer UPGRADE

Affected: < 2.4.86.0 · < 2.5.25.0

Fixed in: 2.4.86.0, 2.5.25.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hevc-video-extensions-from-device-manufacturer || rpm -q hevc-video-extensions-from-device-manufacturer || hevc-video-extensions-from-device-manufacturer --version

2. UPGRADE to 2.4.86.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hevc-video-extensions-from-device-manufacturer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hevc-video-extensions-from-device-manufacturer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-58599?

hevc video extensions: upgrade to 2.4.87.0; hevc video extensions for licensed applications: upgrade to 2.4.85.0; hevc video extensions from device manufacturer: upgrade to 2.4.86.0, 2.5.25.0. Exact commands for each OS are on this page.

Is CVE-2026-58599 being exploited?

CVE-2026-58599 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-2026-58599 affect?

CVE-2026-58599 affects hevc video extensions, hevc video extensions for licensed applications, hevc video extensions from device manufacturer. Severity is high (CVSS 7.8). Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.

How urgent is CVE-2026-58599?

Priority 42/100. High severity; On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

CVE-2026-58600 HIGH 7.8 UPGRADE UPGRADE Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to elevate priv

References

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