{"id":"CVE-2023-43809","aliases":["EUVD-2023-2773","GHSA-mc97-99j4-vm2v","GO-2023-2097"],"status":"published","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01217,"percentile":0.68854,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2023-10-02T23:30:39Z","modified":"2026-10-28T02:31:03Z","fixes":[{"ecosystem":"Go","package":"github.com/charmbracelet/soft-serve","fixed_in":["0.6.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/charmbracelet/soft-serve","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/charmbracelet/soft-serve","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.6.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/charmbracelet/soft-serve","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.6.2"}]}]}],"products":[{"vendor":"charm","product":"soft_serve"},{"vendor":"charmbracelet","product":"soft-serve"}],"references":[{"url":"https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://github.com/charmbracelet/soft-serve/issues/389","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","report","web"]},{"url":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","tags":["x_refsource_MISC","x_transferred","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43809","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mc97-99j4-vm2v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43809.json","tags":["advisory"]},{"url":"https://github.com/charmbracelet/soft-serve","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-43809","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","status":"published","published":"2023-10-04T20:40:41.822Z","modified":"2024-09-20T14:51:49.413Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:35:14.633899Z"}],"euvd":[{"id":"EUVD-2023-2773","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","status":"published","published":"2023-10-04T20:40:41Z","modified":"2024-09-20T14:51:49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T00:28:17.874342Z"}],"ghsa":[{"id":"GHSA-mc97-99j4-vm2v","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","description":"### Impact\n\nA security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve.\n\n### Patches\n\nUsers should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. \n\n### Workarounds\n\nTo workaround this vulnerability without upgrading, users can _temporarily_ disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.\n\n### References\n\nhttps://github.com/charmbracelet/soft-serve/issues/389","status":"published","published":"2023-10-02T23:30:39Z","modified":"2023-11-08T05:01:48Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:37:16.721714Z"}],"nvd":[{"id":"CVE-2023-43809","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","status":"published","published":"2023-10-04T21:15:10.28Z","modified":"2026-06-17T06:26:29.333Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:08:35.022405Z"}],"osv":[{"id":"CVE-2023-43809","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","status":"published","published":"2023-10-04T20:40:41.822Z","modified":"2026-10-28T02:31:03.159669917Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"GHSA-mc97-99j4-vm2v","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","description":"### Impact\n\nA security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve.\n\n### Patches\n\nUsers should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. \n\n### Workarounds\n\nTo workaround this vulnerability without upgrading, users can _temporarily_ disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.\n\n### References\n\nhttps://github.com/charmbracelet/soft-serve/issues/389","status":"published","published":"2023-10-02T23:30:39Z","modified":"2026-09-10T03:49:58.667921668Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"GO-2023-2097","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled in github.com/charmbracelet/soft-serve","description":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled in github.com/charmbracelet/soft-serve","status":"published","published":"2024-08-21T14:30:22Z","modified":"2026-03-03T04:54:16.60072Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}