Medium

go-git: Maliciously crafted idx file can cause asymmetric memory consumption

Type: advisorySources: OSV

go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-34165
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 18:13 UTC · Revision 1

Source evidence

go-git: Maliciously crafted idx file can cause asymmetric memory consumption

core-osv · Original source

Published 31 Mar 2026, 13:46 UTC

osv:CVE-2026-34165

Complete source record

{
  "id": "86090f053a67b6784467385763ef471ee284f7ecca06cc43673c5ec9662f8c76",
  "url": "https://osv.dev/vulnerability/CVE-2026-34165",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "go-git: Maliciously crafted idx file can cause asymmetric memory consumption",
    "summary": "go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.",
    "evidence": "osv:CVE-2026-34165",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-34165",
      "aliases": [
        "CVE-2026-34165",
        "GHSA-jhf3-xxhw-2wpp",
        "GO-2026-4910"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-git/go-git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9d0f15c4fa712cdacfa3887e9baac918f093fbf6"
                },
                {
                  "fixed": "5e23dfd02db92644dc4a3358ceb297fce875b772"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "fixed": "5.17.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5e23dfd02db92644dc4a3358ceb297fce875b772"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.17.1"
                  },
                  {
                    "cpe": "cpe:2.3:a:go-git_project:go-git:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "fixed": "5.17.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.17.0",
            "v5.16.5",
            "v5.16.4",
            "v5.16.3",
            "v5.16.2",
            "v5.16.1",
            "v5.16.0",
            "v5.15.0",
            "v5.14.0",
            "v5.13.2",
            "v5.13.1",
            "v5.13.0",
            "v5.12.0",
            "v5.11.0",
            "v5.10.1",
            "v5.9.0",
            "v5.10.0",
            "v5.8.1",
            "v5.8.0",
            "v5.7.0",
            "v5.6.1",
            "v5.5.2",
            "v5.6.0",
            "v5.5.1",
            "v5.5.0",
            "v5.4.2",
            "v5.4.1",
            "v5.4.0",
            "v5.3.0",
            "v5.2.0",
            "v5.1.0",
            "v5.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34165.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.149679353Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-git/go-git/releases/tag/v5.17.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34165.json",
        "https://github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34165"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-191",
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34165.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34165",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488195,
  "published_at": "2026-03-31T13:46:37.688+00:00"
}