CVE-2026-48095: 7-Zip is a file archiver with a high compression ratio

Q: How do I fix CVE-2026-48095?

7-zip: upgrade to 26.01. Exact commands for each OS are on this page.

Q: Is CVE-2026-48095 being exploited?

CVE-2026-48095 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-2026-48095 affect?

CVE-2026-48095 affects 7-zip. Severity is high (CVSS 8.8). 7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing atta

Q: How urgent is CVE-2026-48095?

Priority 52/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-48095 is a high-severity flaw (CVSS 8.8) affecting 7-zip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a craft

Why this priority

High severity
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	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-190, CWE-787
Published	2026-06-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: 7-zip

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-05 15:16 UTCPublished CVE record published
2026-06-17 10:54 UTCUpdated Record last modified

7-zip 7-zip UPGRADE

Affected: < 26.01

Fixed in: 26.01

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy 7-zip || rpm -q 7-zip || 7-zip --version

2. UPGRADE to 26.01 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade 7-zip

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 7-zip

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-2026-48095?

7-zip: upgrade to 26.01. Exact commands for each OS are on this page.

Is CVE-2026-48095 being exploited?

CVE-2026-48095 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-2026-48095 affect?

CVE-2026-48095 affects 7-zip. Severity is high (CVSS 8.8). 7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing atta

How urgent is CVE-2026-48095?

Priority 52/100. High severity; Public exploit reference

Software pages

7-Zip vulnerabilities

Related CVEs

CVE-2026-58052 LOW 3.3 UPGRADE 7-Zip for Windows through 26.01 fails to preserve the Mark-of-the-Web when extracting a crafted RAR5 archive,
CVE-2026-48112 MEDIUM 6.5 UPGRADE 7-Zip is a file archiver with a high compression ratio
CVE-2026-48111 MEDIUM 4.3 UPGRADE 7-Zip is a file archiver with a high compression ratio
CVE-2026-48104 MEDIUM 4.2 UPGRADE 7-Zip is a file archiver with a high compression ratio
CVE-2026-48103 MEDIUM 4.3 UPGRADE 7-Zip is a file archiver with a high compression ratio

References

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