CVE-2026-27117: bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files

Q: How do I fix CVE-2026-27117?

bit7z: upgrade to 4.0.11. Exact commands for each OS are on this page.

Q: Is CVE-2026-27117 being exploited?

CVE-2026-27117 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-2026-27117 affect?

CVE-2026-27117 affects bit7z. Severity is medium (CVSS 5.5). bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.11, a path traversal vulnerability ("Zip Slip") exists in bit7z's archive extraction functionality. The library does

Q: How urgent is CVE-2026-27117?

Priority 32/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2026-27117 is a medium-severity flaw (CVSS 5.5) affecting bit7z. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.11, a path traversal vulnerability ("Zip Slip") exists in bit7z's archive extraction functionality. The library does not adequately validate file paths contained in archive entries, allowing files to be written outside the intended extraction directory through three distinct mechanisms: relative path traversal, absolute path

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-22, CWE-23, CWE-36
Published	2026-02-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: rikyoz

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

Am I affected?

Timeline

2026-02-24 22:16 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

rikyoz bit7z UPGRADE

Affected: < 4.0.11

Fixed in: 4.0.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bit7z || rpm -q bit7z || bit7z --version

2. UPGRADE to 4.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bit7z

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bit7z

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-2026-27117?

bit7z: upgrade to 4.0.11. Exact commands for each OS are on this page.

Is CVE-2026-27117 being exploited?

CVE-2026-27117 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-2026-27117 affect?

CVE-2026-27117 affects bit7z. Severity is medium (CVSS 5.5). bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.11, a path traversal vulnerability ("Zip Slip") exists in bit7z's archive extraction functionality. The library does

How urgent is CVE-2026-27117?

Priority 32/100. Public exploit reference

References

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