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Fencer Intel
high 7.8

CVE-2026-79655 json

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

published 2mo ago modified 19h ago also EUVD-2026-65492

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:4.11.2-7.el10_3
  • Red Hat Red Hat Enterprise Linux 9 0:4.11.2-7.el9_9
  • sos Debian 14 4.12.0-2

debian advisories DEBIAN-CVE-2026-79655

  • sos Azure Linux 3.0 4.6.1-3

azure linux advisories AZL-98211

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-79655 updated cvss 7.8

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

  • Red Hat Enterprise Linux 6 sos
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 sos, sos-audit
    affected: workaround, no fix available
  • Red Hat Enterprise Linux BaseOS (v. 9) sos 4.11.2-7.el9_9, sos-audit 4.11.2-7.el9_9
    fixed: vendor fix RHSA-2026:97867
  • Red Hat Enterprise Linux BaseOS (v. 10) sos 4.11.2-7.el10_3
    fixed: vendor fix RHSA-2026:98076
  • Red Hat Enterprise Linux 7 sos
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/sosreport/sos/issues/4460 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.