CVE-2026-45570: go-git Improper Single-quote Escaping Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m7cr-m3pv-hgrp",
  "modified" : "2026-06-08T23:42:58Z",
  "published" : "2026-05-19T15:21:01Z",
  "aliases" : [ "CVE-2026-45570" ],
  "summary" : "go-git: Improper single-quote escaping in go-git SSH transport",
  "details" : "### Impact\n\n`go-git`'s SSH transport constructs the remote exec command by wrapping the repository path in single quotes without escaping single quotes embedded inside the path. This diverges from canonical Git, which shell-quotes the path through `sq_quote_buf` so that an embedded `'` becomes the `'\\''` close-escape-reopen sequence and the whole path round-trips as a single quoted argument.\n\nA repository path containing a single quote can therefore break out of the quoted region in the exec command and be appended as additional shell tokens. On SSH servers that evaluate the exec command through a shell (for example a user account whose login shell is `/bin/sh` or `/bin/bash`, or a `ForceCommand` wrapper that re-evaluates `$SSH_ORIGINAL_COMMAND`), those additional tokens execute in that account's command-execution context. SSH servers that tokenize the exec command without shell evaluation, including the canonical `git-shell` setup, are not affected.\n\nThe vulnerable behaviour is on the SSH server side, not in `go-git`: the same bytes can be produced by any SSH client. The change in `go-git` is defense-in-depth that restores parity with canonical Git's wire format and prevents `go-git` from being a vehicle for reaching shell-evaluating servers through attacker-influenced repository paths.\n\n### Patches\n\nUsers should upgrade to a patched version in order to mitigate this issue. The fix ports `sq_quote_buf` from canonical Git into `go-git`'s SSH transport so that the wire output is byte-identical to what `git` itself would send for the same input.\n\nVersions prior to `v5` are likely to be affected, users are recommended to upgrade to a supported go-git version.\n\n### Credit\n\nThanks to @N0zoM1z0 for reporting this to the `go-git` project. :bow:",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/go-git/go-git/v5"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.19.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.19.0"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/go-git/go-git/v6"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.0.0-alpha.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 6.0.0-alpha.3"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/go-git/go-git"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "4.7.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/go-git/go-git/security/advisories/GHSA-m7cr-m3pv-hgrp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45570"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-git/go-git"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-19T15:21:01Z",
    "nvd_published_at" : "2026-05-27T15:16:30Z"
  }
}