CVE-2026-55798: Arbitrary command injection via shell metacharacters in file paths
CVE-2026-55798 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- High
- CVSS base score
- 4.5 (Red Hat)
- CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L(Red Hat)
- Weakness
- CWE-78
- Fixed releases
- Red Hat: 12.3.0
- Listed by VulniPulse
- Record changed
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-55798; each belongs to its advisory, not to every product listed. How records are collected and checked.
How do I fix CVE-2026-55798?
Upgrade to a fixed release named by the vendor:
- Red Hat: 12.3.0
- This vulnerability is specific to the WindowsViewer class in Pillow, which is only invoked on Windows systems. Red Hat products ship and run on Linux, where the UnixViewer class is used instead, which properly applies shlex.quote() to file paths. The vulnerable Windows code path is not reachable on Red Hat's supported platforms. Users can upgrade to Pillow 12.3.0 or later, which adds proper escaping to the Windows code path. (Red Hat)
Vendor advisories for CVE-2026-55798
Red Hat
1 advisory- Advisory severityMedium4.5
Medium [CVE-2026-55798] Arbitrary command injection via shell metacharacters in file paths
CVE-2026-55798Source published Source updated
Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess. Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0. An attacker could exploit this to execute unauthorized commands on the system. The vulnerability is specific to the Windows platform; the Linux (UnixViewer) and macOS (MacViewer) equivalents already apply proper shell quoting. Red Hat severity: Moderate — CVSS 4.5 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L). Weakness: CWE-78. Red Hat lists Exploit Intelligence; Lightspeed Core; OpenShift Lightspeed; Red Hat AI Inference…
- Affected products in this advisory
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- < 12.3.0
- Source-reported fixed versions
- 12.3.0
- Mitigation guidance
- This vulnerability is specific to the WindowsViewer class in Pillow, which is only invoked on Windows systems. Red Hat products ship and run on Linux, where the UnixViewer class is used instead, which properly applies shlex.quote() to file paths. The vulnerable Windows code path is not reachable on Red Hat's supported platforms. Users can upgrade to Pillow 12.3.0 or later, which adds proper escaping to the Windows code path.
Splunk
1 advisory- Advisory severityHigh
High [CVE-2024-34062 +48] Third-Party Package Updates in Splunk SOAR - October 2026
SVD-2026-1012Source published
This bulletin covers 49 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
Splunk remedied common vulnerabilities and exposures (CVEs) in third-party packages in Splunk SOAR version 8.7.0 or higher. Affected product named by the advisory: Splunk SOAR 8.7.
- Affected products in this advisory
- Splunk SOAR 8.7
- Source-reported affected versions
- Splunk SOAR Below 8.7.0
- Source-reported fixed versions
- Splunk SOAR 8.7.0
- Mitigation guidance
- Upgrade Splunk SOAR to version 8.7.0 or higher.
References
More Red Hat advisories
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