DEBIAN-CVE-2026-18508

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Source
https://security-tracker.debian.org/tracker/CVE-2026-18508
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18508.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-18508
Upstream
  • CVE-2026-18508
Published
2026-08-03T16:16:28Z
Modified
2026-09-11T08:47:34Z
Severity
  • 4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.

References

Affected packages

Debian:12 / tar

Package

Name
tar
Purl
pkg:deb/debian/tar?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.34+dfsg-1.2
1.34+dfsg-1.2+deb12u1
1.34+dfsg-1.3
1.34+dfsg-1.4
1.35+dfsg-1
1.35+dfsg-2
1.35+dfsg-3
1.35+dfsg-3.1
1.35+dfsg-4
1.35+dfsg-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18508.json"

Debian:13 / tar

Package

Name
tar
Purl
pkg:deb/debian/tar?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.35+dfsg-3.1
1.35+dfsg-4
1.35+dfsg-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18508.json"

Debian:14 / tar

Package

Name
tar
Purl
pkg:deb/debian/tar?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.35+dfsg-3.1
1.35+dfsg-4
1.35+dfsg-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18508.json"