{"cve":"CVE-2023-43809","nvd":{"published":"2023-10-04T21:15:10.280","modified":"2026-06-17T06:26:29.333","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-287"],"references":["https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","https://github.com/charmbracelet/soft-serve/issues/389","https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89"],"products":["charm:soft_serve"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-43809","score":0.01217,"percentile":0.68611,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mc97-99j4-vm2v","url":"https://osv.dev/vulnerability/GHSA-mc97-99j4-vm2v","summary":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","modified":"2026-09-10T03:49:58.667921668Z","packages":[{"ecosystem":"Go","name":"github.com/charmbracelet/soft-serve","purl":"pkg:golang/github.com/charmbracelet/soft-serve","ranges":["<0.6.2"],"fixed":["0.6.2"]}]},{"id":"GO-2023-2097","url":"https://osv.dev/vulnerability/GO-2023-2097","summary":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled in github.com/charmbracelet/soft-serve","modified":"2026-03-03T04:54:16.600720Z","packages":[{"ecosystem":"Go","name":"github.com/charmbracelet/soft-serve","purl":"pkg:golang/github.com/charmbracelet/soft-serve","ranges":["<0.6.2"],"fixed":["0.6.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}