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CVE-2026-79655

Sos: sos: path traversal in sos clean tar extraction via unvalidated symlink/hardlink targets leads to arbitrary file write

7.8 HighFix available

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.21%Up 0.1 points since Aug 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.8

Sos: sos: path traversal in sos clean tar extraction via unvalidated symlink/hardlink targets leads to arbitrary file write

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
CVE-2026-79655
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-59
Updated
2026-11-02
EUVDEUVD-2026-65492 7.8

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
EUVD-2026-65492
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-jhqm-m4j3-wqq2 7.8

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a...

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
GHSA-jhqm-m4j3-wqq2
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-59
Updated
2026-11-02
NVD 7.8

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
CVE-2026-79655
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-59
Updated
2026-11-05
OSVDEBIAN-CVE-2026-79655 7.8

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
DEBIAN-CVE-2026-79655
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-05
OSVUBUNTU-CVE-2026-79655 7.8

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
UBUNTU-CVE-2026-79655
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVAZL-98211 No score

CVE-2026-79655 affecting package sos for versions less than 4.6.1-3

A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.

Record
AZL-98211
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
sos
Azure Linux:3
before 4.6.1-3
4.6.1-3
sos
Debian:13
All versions, plus listed versions
4.10.0-14.10.0-1~bpo12+14.10.0-1~bpo13+14.10.1-14.10.1-1~bpo12+1
Show 20 moreShow less
4.10.1-1~bpo13+14.10.2-14.10.2-1+really4.9.1-1~bpo12+14.10.2-1~bpo12+14.10.2-1~bpo13+14.11.0-14.11.1-14.11.1-24.11.1-2~bpo13+14.11.2-14.11.2-1~bpo13+14.12.0-14.12.0-1~bpo13+14.12.0-24.12.0-2~bpo13+14.12.1-14.9.1-14.9.2-14.9.2-24.9.2-3
None known
sos
Debian:14
before 4.12.0-2, plus listed versions
4.10.0-14.10.0-1~bpo12+14.10.0-1~bpo13+14.10.1-14.10.1-1~bpo12+1
Show 18 moreShow less
4.10.1-1~bpo13+14.10.2-14.10.2-1+really4.9.1-1~bpo12+14.10.2-1~bpo12+14.10.2-1~bpo13+14.11.0-14.11.1-14.11.1-24.11.1-2~bpo13+14.11.2-14.11.2-1~bpo13+14.12.0-14.12.0-1~bpo13+14.12.0-2~bpo13+14.9.1-14.9.2-14.9.2-24.9.2-3
4.12.0-2
sosreport
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
3.0-13.1-13.1-1ubuntu13.1-1ubuntu23.1-1ubuntu2.1
Show 5 moreShow less
3.1-1ubuntu2.23.4-1~ubuntu14.04.13.5-1~ubuntu14.04.23.5-1~ubuntu14.04.33.5-1~ubuntu14.04.3+esm1
None known
sosreport
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
3.2-2ubuntu13.2+git276-g7da50d6-13.2+git276-g7da50d6-23.2+git276-g7da50d6-33.2+git276-g7da50d6-3build1
Show 12 moreShow less
3.2+git276-g7da50d6-3ubuntu13.4-1~ubuntu16.04.13.5-1~ubuntu16.04.23.5-1~ubuntu16.04.33.6-1ubuntu0.16.04.23.6-1ubuntu0.16.04.33.6-1ubuntu0.16.04.43.9-1ubuntu0.16.04.13.9-1ubuntu0.16.04.23.9.1-1ubuntu0.16.04.13.9.1-1ubuntu0.16.04.23.9.1-1ubuntu0.16.04.2+esm1
None known
sosreport
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
3.4-13.5-13.5-1ubuntu13.5-1ubuntu23.5-1ubuntu3
Show 18 moreShow less
3.5-1ubuntu3.18.04.13.6-1ubuntu0.18.04.23.6-1ubuntu0.18.04.33.6-1ubuntu0.18.04.43.9-1ubuntu0.18.04.13.9-1ubuntu0.18.04.23.9-1ubuntu0.18.04.33.9.1-1ubuntu0.18.04.13.9.1-1ubuntu0.18.04.23.9.1-1ubuntu0.18.04.34.1-1ubuntu0.18.04.14.1-1ubuntu0.18.04.24.1-1ubuntu0.18.04.34.3-1ubuntu0.18.04.14.3-1ubuntu0.18.04.24.4-1ubuntu0.18.04.14.4-1ubuntu0.18.04.34.8.2-0ubuntu0~18.04.1~esm1
None known
sosreport
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
3.6-1ubuntu33.8-1ubuntu13.8-1ubuntu23.8-1ubuntu33.9-1ubuntu1
Show 20 moreShow less
3.9-1ubuntu23.9-1ubuntu2.13.9.1-1ubuntu0.20.04.13.9.1-1ubuntu0.20.04.24.0-1~ubuntu0.20.04.14.0-1~ubuntu0.20.04.24.0-1~ubuntu0.20.04.34.1-1ubuntu0.20.04.14.1-1ubuntu0.20.04.24.1-1ubuntu0.20.04.34.2-1ubuntu0.20.04.14.3-1ubuntu0.20.04.14.3-1ubuntu0.20.04.24.4-1ubuntu0.20.04.14.5.6-0ubuntu1~20.04.14.5.6-0ubuntu1~20.04.24.7.2-0ubuntu1~20.04.14.7.2-0ubuntu1~20.04.24.8.2-0ubuntu0~20.04.14.11.1-0ubuntu0.20.04.1~esm1
None known
sosreport
Ubuntu:22.04:LTS
All versions, plus listed versions
4.1-1ubuntu24.1-1ubuntu34.2-1ubuntu24.3-1ubuntu14.3-1ubuntu2
Show 11 moreShow less
4.3-1ubuntu2.14.4-1ubuntu1.22.04.14.5.6-0ubuntu1~22.04.14.5.6-0ubuntu1~22.04.24.7.2-0ubuntu1~22.04.14.7.2-0ubuntu1~22.04.24.8.2-0ubuntu0~22.04.14.8.2-0ubuntu0~22.04.24.9.2-0ubuntu0~22.04.14.10.2-0ubuntu0~22.04.14.11.2-0ubuntu0~22.04.1
None known
sosreport
Ubuntu:24.04:LTS
All versions, plus listed versions
4.5.6-0ubuntu24.5.6-0ubuntu44.7.2-0ubuntu1~24.04.14.7.2-0ubuntu1~24.04.24.8.2-0ubuntu0~24.04.1
Show 4 moreShow less
4.8.2-0ubuntu0~24.04.24.9.2-0ubuntu0~24.04.14.10.2-0ubuntu0~24.04.14.11.2-0ubuntu0~24.04.1
None known
sos
Ubuntu:26.10
All versions, plus listed versions
4.10.2-14.11.1-24.11.2-1
None known
sos
Ubuntu:26.04:LTS
All versions, plus listed versions
4.10.0-14.10.1-14.10.2-14.11.2-0ubuntu0.1
None known

History

History
RecordedChangedSources
affectedOSV
factsNVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-79655 is a high vulnerability (CVSS 7.8) in Red Hat Enterprise Linux 10, published August 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. Fixed in sos 4.6.1-3.

References

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