CVE-2026-70351: Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute co

Q: How do I fix CVE-2026-70351?

webp image extension: upgrade to 1.2.31.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-70351 being exploited?

CVE-2026-70351 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-2026-70351 affect?

CVE-2026-70351 affects webp image extension. Severity is high (CVSS 8.8). Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.

Q: How urgent is CVE-2026-70351?

Priority 50/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-70351 is a high-severity flaw (CVSS 8.8) affecting webp image extension. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

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	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-122, CWE-190
Published	2026-09-08
Last modified	2026-09-29

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:20 UTCPublished CVE record published
2026-09-29 19:47 UTCUpdated Record last modified

microsoft webp image extension UPGRADE

Affected: < 1.2.31.0

Fixed in: 1.2.31.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webp-image-extension || rpm -q webp-image-extension || webp-image-extension --version

2. UPGRADE to 1.2.31.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webp-image-extension

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webp-image-extension

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-2026-70351?

webp image extension: upgrade to 1.2.31.0. Exact commands for each OS are on this page.

Is CVE-2026-70351 being exploited?

CVE-2026-70351 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-2026-70351 affect?

CVE-2026-70351 affects webp image extension. Severity is high (CVSS 8.8). Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-70351?

Priority 50/100. High severity; On your watchlist

References

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