{"id":"CVE-2023-49284","aliases":["AZL-32081","DEBIAN-CVE-2023-49284","EUVD-2023-53277","GHSA-2j9r-pm96-wp4f","MGASA-2023-0344","OESA-2023-1933","OESA-2023-1938","OESA-2023-1939","OESA-2023-1940","ROOT-OS-ALPINE-317-CVE-2023-49284","ROOT-OS-ALPINE-318-CVE-2023-49284","UBUNTU-CVE-2023-49284","openSUSE-SU-2023:0404-1","openSUSE-SU-2023:0405-1","openSUSE-SU-2024:13501-1"],"status":"published","title":"Command substitution output can trigger shell expansion in fish shell","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","severity":{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00475,"percentile":0.41353,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2023-12-04T23:46:35Z","modified":"2026-10-28T10:36:09Z","fixes":[{"ecosystem":"Azure Linux:2","package":"fish","fixed_in":["3.6.2-1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"fish","fixed_in":["3.6.0-3.1+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"fish","fixed_in":["3.6.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"fish","fixed_in":["3.6.4-1"],"sources":["osv"]},{"ecosystem":"Mageia:8","package":"fish","fixed_in":["3.4.1-1.1.mga8"],"sources":["osv"]},{"ecosystem":"Mageia:9","package":"fish","fixed_in":["3.6.4-1.mga9"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"fish","fixed_in":["3.3.1-3.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP3","package":"fish","fixed_in":["3.3.1-3.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP1","package":"fish","fixed_in":["3.3.1-6.oe2203sp1"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP2","package":"fish","fixed_in":["3.3.1-6.oe2203sp2"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS","package":"fish","fixed_in":["3.3.1-5.oe2203"],"sources":["osv"]},{"ecosystem":"Root:Alpine:3.17","package":"fish","fixed_in":["3.5.1-r10071","3.5.1-r10072","3.5.1-r10074","3.5.1-r10073","3.5.1-r10075"],"sources":["osv"]},{"ecosystem":"Root:Alpine:3.17","package":"rootio-fish","fixed_in":["3.5.1-r10071","3.5.1-r10072","3.5.1-r10074","3.5.1-r10073","3.5.1-r10075"],"sources":["osv"]},{"ecosystem":"Root:Alpine:3.18","package":"fish","fixed_in":["3.6.1-r20071","3.6.1-r20072","3.6.1-r20074","3.6.1-r20073","3.6.1-r20075"],"sources":["osv"]},{"ecosystem":"Root:Alpine:3.18","package":"rootio-fish","fixed_in":["3.6.1-r20071","3.6.1-r20072","3.6.1-r20074","3.6.1-r20073","3.6.1-r20075"],"sources":["osv"]},{"ecosystem":"SUSE:Package Hub 15 SP4","package":"fish","fixed_in":["3.3.1-bp154.3.3.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 15.4","package":"fish","fixed_in":["3.3.1-bp154.3.3.1"],"sources":["osv"]},{"ecosystem":"SUSE:Package Hub 15 SP5","package":"fish","fixed_in":["3.3.1-bp155.4.3.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 15.5","package":"fish","fixed_in":["3.3.1-bp155.4.3.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"fish","fixed_in":["3.6.4-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:2","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.2-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.0-3.1+deb12u1"}]}],"versions":["3.6.0-3.1"]},{"source":"osv","ecosystem":"Debian:13","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1"}]}]},{"source":"osv","ecosystem":"Mageia:8","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.1-1.1.mga8"}]}]},{"source":"osv","ecosystem":"Mageia:9","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1.mga9"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-3.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-3.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP1","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-6.oe2203sp1"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP2","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-6.oe2203sp2"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-5.oe2203"}]}]},{"source":"osv","ecosystem":"Root:Alpine:3.17","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.1-r10071"},{"fixed":"3.5.1-r10072"},{"fixed":"3.5.1-r10074"},{"fixed":"3.5.1-r10073"},{"fixed":"3.5.1-r10075"}]}]},{"source":"osv","ecosystem":"Root:Alpine:3.17","package":"rootio-fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.1-r10071"},{"fixed":"3.5.1-r10072"},{"fixed":"3.5.1-r10074"},{"fixed":"3.5.1-r10073"},{"fixed":"3.5.1-r10075"}]}]},{"source":"osv","ecosystem":"Root:Alpine:3.18","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.1-r20071"},{"fixed":"3.6.1-r20072"},{"fixed":"3.6.1-r20074"},{"fixed":"3.6.1-r20073"},{"fixed":"3.6.1-r20075"}]}]},{"source":"osv","ecosystem":"Root:Alpine:3.18","package":"rootio-fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.1-r20071"},{"fixed":"3.6.1-r20072"},{"fixed":"3.6.1-r20074"},{"fixed":"3.6.1-r20073"},{"fixed":"3.6.1-r20075"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-2","2.2.0-3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.0-1","2.6.0-2","2.7.0-1","2.7.1-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.2-2","3.1.0-1","3.1.0-1.1","3.1.0-1.2","3.1.0-1.2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.2-3ubuntu1","3.3.1+ds-2","3.3.1+ds-3","3.3.1+ds-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.1-1","3.6.4-1","3.7.0-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.1-1","4.0.2-1","4.0.6-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-3.2","4.7.1-2","4.7.1-2.1","4.9.3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.6-0ubuntu1","4.2.1-3","4.2.1-3.1","4.2.1-3.2"]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP4","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-bp154.3.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.4","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-bp154.3.3.1"}]}]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP5","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-bp155.4.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.5","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-bp155.4.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"fish","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1.1"}]}]}],"products":[{"vendor":"fish-shell","product":"fish-shell"},{"vendor":"fishshell","product":"fish"}],"references":[{"url":"https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","report"]},{"url":"https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14","tags":["x_refsource_MISC","x_transferred","Patch","fix","report"]},{"url":"http://www.openwall.com/lists/oss-security/2023/12/08/1","tags":["x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49284","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49284.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-49284","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2023-0344.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=32614","tags":["report"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1933","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1938","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1939","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1940","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-49284","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-49284","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/ID5OSVJXPI7OW4ZTAPE4ZJUJIM5HRF37/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1217808","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2023-49284","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/S6BKN7QOVK7LIAFEI3YVTBXDS7YGI6B3/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-49284","title":"Command substitution output can trigger shell expansion in fish shell","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-04T23:46:35.567Z","modified":"2025-02-13T17:18:37.222Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:35:12.998024Z"}],"euvd":[{"id":"EUVD-2023-53277","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-04T23:46:35Z","modified":"2025-02-13T17:18:37Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low"}],"updated_at":"2026-11-03T00:03:48.029386Z"}],"nvd":[{"id":"CVE-2023-49284","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-05T00:15:08.737Z","modified":"2026-06-17T06:35:45.94Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low","assessor":"secondary"},{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:08:52.544469Z"}],"osv":[{"id":"AZL-32081","title":"CVE-2023-49284 affecting package fish for versions less than 3.6.2-1","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-05T00:15:08Z","modified":"2026-04-21T04:26:39.196079Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:03.46006Z"},{"id":"CVE-2023-49284","title":"Command substitution output can trigger shell expansion in fish shell","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-04T23:46:35.567Z","modified":"2026-10-28T10:36:09.143513859Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:44:34.72355Z"},{"id":"DEBIAN-CVE-2023-49284","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-05T00:15:08.737Z","modified":"2026-10-26T18:02:50.647438589Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:40.275853Z"},{"id":"OESA-2023-1933","title":"fish security update","description":"fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.\r\n\r\nSecurity Fix(es):\r\n\r\nfish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2023-49284)","status":"published","published":"2023-12-15T11:06:22Z","modified":"2026-08-18T01:18:06.515236847Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2023-1938","title":"fish security update","description":"fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.\r\n\r\nSecurity Fix(es):\r\n\r\nfish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2023-49284)","status":"published","published":"2023-12-22T11:06:23Z","modified":"2026-08-18T01:18:06.431797243Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2023-1939","title":"fish security update","description":"fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.\r\n\r\nSecurity Fix(es):\r\n\r\nfish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2023-49284)","status":"published","published":"2023-12-22T11:06:23Z","modified":"2026-08-18T01:18:06.930405386Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2023-1940","title":"fish security update","description":"fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.\r\n\r\nSecurity Fix(es):\r\n\r\nfish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2023-49284)","status":"published","published":"2023-12-22T11:06:23Z","modified":"2026-08-18T01:18:05.889606723Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"UBUNTU-CVE-2023-49284","description":"fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2023-12-05T00:15:00Z","modified":"2026-10-17T12:56:26.181451179Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","level":"low"},{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:54:23.935133Z"},{"id":"MGASA-2023-0344","title":"Updated fish packages fix a security vulnerability","description":"Mageia 9 is updated to version 3.6.4 to fix CVE-2023-49284.\nMageia 8 receives an upstream patch to fix CVE-2023-49284.\nCVE-2023-49284: fish shell uses certain Unicode non-characters\ninternally for marking wildcards and expansions. It will incorrectly\nallow these markers to be read on command substitution output, rather\nthan transforming them into a safe internal representation.\n","status":"published","published":"2023-12-12T21:19:08Z","modified":"2026-04-16T04:41:45.895932366Z","updated_at":"2026-11-02T15:49:42.684501Z"},{"id":"openSUSE-SU-2023:0404-1","title":"Security update for fish","description":"This update for fish fixes the following issues:\n\n- CVE-2023-49284: Fixed shell expansion triggered by command substitution output (boo#1217808).\n","status":"published","published":"2023-12-16T13:01:09Z","modified":"2026-02-04T02:56:38.505942Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"openSUSE-SU-2023:0405-1","title":"Security update for fish","description":"This update for fish fixes the following issues:\n\n- CVE-2023-49284: Fixed shell expansion triggered by command substitution output (boo#1217808).\n","status":"published","published":"2023-12-16T13:01:13Z","modified":"2026-02-04T03:25:33.545253Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"openSUSE-SU-2024:13501-1","title":"fish-3.6.4-1.1 on GA media","description":"These are all security issues fixed in the fish-3.6.4-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:40:42.196566Z","updated_at":"2026-11-02T16:58:36.327643Z"},{"id":"ROOT-OS-ALPINE-317-CVE-2023-49284","title":"CVE-2023-49284 in fish - Patched by Root","description":"Root has patched CVE-2023-49284 in the fish package for Root:Alpine:3.17. Multiple fixed versions available.","status":"published","published":"2026-09-29T09:26:12Z","modified":"2026-09-29T10:15:08.520131813Z","updated_at":"2026-11-02T15:53:28.259095Z"},{"id":"ROOT-OS-ALPINE-318-CVE-2023-49284","title":"CVE-2023-49284 in fish - Patched by Root","description":"Root has patched CVE-2023-49284 in the fish package for Root:Alpine:3.18. Multiple fixed versions available.","status":"published","published":"2026-09-29T09:45:34Z","modified":"2026-09-29T10:15:05.828537247Z","updated_at":"2026-11-02T15:53:28.259095Z"}]}}