CVSS 3.1 Score 6.6 of 10 (medium)


Published Dec 5, 2023
Updated: Dec 8, 2023
CWE ID 436


CVE-2023-49284 is a vulnerability affecting the fish shell, a command line shell used in macOS, Linux, and other operating systems. The vulnerability allows certain Unicode non-characters to be read as wildcards and expansions, instead of converting them into a safe internal representation. While this may cause unexpected behavior with direct input, it can pose a minor security problem if the output is being fed into a command substitution where such output may not be expected. This flaw has been present in every version of fish released in the last 15 years or more. Although code execution does not appear to be possible, it can potentially lead to denial of service through large brace expansion or information disclosure. The vulnerability has a base severity rating of MEDIUM and a high confidentiality impact according to the NIST National Vulnerability Database (NVD). It affects numerous products and requires low privileges and user interaction to exploit.

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