CVE-2026-55173: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in WWBN AVideo
WWBN AVideo versions 29.0 and below are vulnerable to OS command injection due to incomplete sanitization of special shell characters in the sanitizeFFmpegCommand() function. The vulnerability arises because the single ampersand (&), a shell background operator, was not neutralized, allowing attackers who can craft a valid encrypted payload to execute arbitrary OS commands. This can lead to high impact including full confidentiality, integrity, and availability compromise. A patch addressing this issue has been committed upstream.
AI Analysis
Technical Summary
CVE-2026-55173 is an OS command injection vulnerability in WWBN AVideo affecting versions 29.0 and earlier. It stems from an incomplete fix for CVE-2026-33482 where the sanitizeFFmpegCommand() function failed to neutralize the single '&' character, allowing attackers to chain multiple commands via the shell background operator. The vulnerability occurs in the execAsync() function that executes shell commands constructed from decrypted input. Although redirection operators are blocked, the '&' operator enables execution of multiple commands such as downloading and running malicious files. The vulnerability has a CVSS 3.1 score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). A patch fixing this issue was committed in the referenced GitHub commit.
Potential Impact
Successful exploitation allows an unauthenticated attacker who can craft a valid encrypted payload to execute arbitrary OS commands on the standalone encoder server. This can lead to full system compromise including confidentiality, integrity, and availability impacts. The vulnerability enables chaining of multiple commands via the '&' operator, facilitating complex attack payloads such as downloading and executing malicious files.
Mitigation Recommendations
A patch fixing this vulnerability has been committed by the vendor (see https://github.com/WWBN/AVideo/commit/c1cfa2bea8a351a1d07f5758f82887403e3abf1). Users should update to the fixed version incorporating this commit. No official remediation level or vendor advisory was provided in the input data. Patch status is not yet confirmed by an official advisory; users should verify with the vendor for current remediation guidance.
CVE-2026-55173: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in WWBN AVideo
Description
WWBN AVideo versions 29.0 and below are vulnerable to OS command injection due to incomplete sanitization of special shell characters in the sanitizeFFmpegCommand() function. The vulnerability arises because the single ampersand (&), a shell background operator, was not neutralized, allowing attackers who can craft a valid encrypted payload to execute arbitrary OS commands. This can lead to high impact including full confidentiality, integrity, and availability compromise. A patch addressing this issue has been committed upstream.
CVSS v3.1
Score 8.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55173 is an OS command injection vulnerability in WWBN AVideo affecting versions 29.0 and earlier. It stems from an incomplete fix for CVE-2026-33482 where the sanitizeFFmpegCommand() function failed to neutralize the single '&' character, allowing attackers to chain multiple commands via the shell background operator. The vulnerability occurs in the execAsync() function that executes shell commands constructed from decrypted input. Although redirection operators are blocked, the '&' operator enables execution of multiple commands such as downloading and running malicious files. The vulnerability has a CVSS 3.1 score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). A patch fixing this issue was committed in the referenced GitHub commit.
Potential Impact
Successful exploitation allows an unauthenticated attacker who can craft a valid encrypted payload to execute arbitrary OS commands on the standalone encoder server. This can lead to full system compromise including confidentiality, integrity, and availability impacts. The vulnerability enables chaining of multiple commands via the '&' operator, facilitating complex attack payloads such as downloading and executing malicious files.
Mitigation Recommendations
A patch fixing this vulnerability has been committed by the vendor (see https://github.com/WWBN/AVideo/commit/c1cfa2bea8a351a1d07f5758f82887403e3abf1). Users should update to the fixed version incorporating this commit. No official remediation level or vendor advisory was provided in the input data. Patch status is not yet confirmed by an official advisory; users should verify with the vendor for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T15:20:43.085Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a59439468715ace43af3f52
Added to database: 07/16/2026, 20:48:20 UTC
Last enriched: 07/16/2026, 21:02:29 UTC
Last updated: 07/16/2026, 21:07:22 UTC
Views: 3
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