Vulnerability-Lookup

CVE-2026-71556 (GCVE-0-2026-71556)

Vulnerability from cvelistv5 – Published: 2026-08-07 16:37 – Updated: 2026-08-07 16:58

Title

go-git: Worktree operations may follow symlinks

Summary

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.2 and 6.0.0-alpha.5, worktree operations (including checkout, status, and add) resolve symbolic links inside the working tree without confining resolution to the worktree boundary, so a maliciously crafted repository containing a symlink can cause go-git to read from or write to files outside the intended working directory when the repository is cloned and its worktree operations are used. Versions 5.19.2 and 6.0.0-alpha.5.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 16:58 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/go-git/go-git/security/advisor…	x_refsource_CONFIRM
https://github.com/go-git/go-git/commit/008a78f2d…	x_refsource_MISC
https://github.com/go-git/go-git/commit/661d1c7f1…	x_refsource_MISC
https://github.com/go-git/go-git/releases/tag/v5.19.2	x_refsource_MISC
https://github.com/go-git/go-git/releases/tag/v6.…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
go-git	go-git	Affected: < 5.19.2 Affected: >= 6.0.0-alpha.1, < 6.0.0-alpha.5	guessed

Show details on NVD website

JSON

To clipboard

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RHSA-2026:66363

Vulnerability from csaf_redhat - Published: 2026-09-10 08:49 - Updated: 2026-09-20 01:27

Summary

Red Hat Security Advisory: external secrets operator for Red Hat OpenShift 1.2.1

Severity

Important

Scope

8 vulnerabilities in this advisory, including CVE-2026-71556.

CVE-2026-71556

A flaw was found in go-git, an extensible Git implementation library. Worktree operations, such as checkout, status, and add, resolve symbolic links within the working tree without proper boundary confinement. This allows a remote attacker to craft a malicious repository containing a symlink, which, when cloned and its worktree operations are used, can lead to reading from or writing to arbitrary files outside the intended working directory. This could result in information disclosure or arbitrary file modification.

7.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:66363

Open the full advisory

RHSA-2026:66421

Vulnerability from csaf_redhat - Published: 2026-09-10 13:38 - Updated: 2026-09-18 13:54

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

1 vulnerability in this advisory, including CVE-2026-71556.

CVE-2026-71556

7.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:66421

Open the full advisory

RHSA-2026:68334

Vulnerability from csaf_redhat - Published: 2026-09-16 18:05 - Updated: 2026-09-20 02:21

Summary

Red Hat Security Advisory: Red Hat Edge Manager Version 1.1.4 Security Update

Severity

Important

Scope

23 vulnerabilities in this advisory, including CVE-2026-71556.

CVE-2026-71556

7.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Fixed: 18 products Known not affected: 18 products

https://access.redhat.com/errata/RHSA-2026:68334

Open the full advisory

RHSA-2026:68335

Vulnerability from csaf_redhat - Published: 2026-09-16 18:05 - Updated: 2026-09-20 01:27

Summary

Red Hat Security Advisory: Red Hat Edge Manager Version 1.2.1 Security Update

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2026-71556.

CVE-2026-71556

7.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Fixed: 18 products Known not affected: 18 products

https://access.redhat.com/errata/RHSA-2026:68335

Open the full advisory

UBUNTU-CVE-2026-71556 (CVE-2026-71556)

Vulnerability from osv_ubuntu – Published: 2026-08-07 17:17 – Updated: 2026-08-13 00:14 – Source website

Details

Severity

7.1 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-71556	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-71556	REPORT
	https://github.com/go-git/go-git/commit/008a78f2d…	REPORT
	https://github.com/go-git/go-git/commit/661d1c7f1…	REPORT
	https://github.com/go-git/go-git/releases/tag/v5.19.2	REPORT
	https://github.com/go-git/go-git/releases/tag/v6.…	REPORT
	https://github.com/go-git/go-git/security/advisor…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "go-git",
            "binary_version": "5.4.2-3ubuntu0.1~esm2"
          },
          {
            "binary_name": "golang-github-go-git-go-git-dev",
            "binary_version": "5.4.2-3ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "golang-github-go-git-go-git",
        "purl": "pkg:deb/ubuntu/golang-github-go-git-go-git@5.4.2-3ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.2-3",
        "5.4.2-3ubuntu0.1~esm1",
        "5.4.2-3ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "go-git",
            "binary_version": "5.4.2-4ubuntu0.24.04.3+esm3"
          },
          {
            "binary_name": "golang-github-go-git-go-git-dev",
            "binary_version": "5.4.2-4ubuntu0.24.04.3+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "golang-github-go-git-go-git",
        "purl": "pkg:deb/ubuntu/golang-github-go-git-go-git@5.4.2-4ubuntu0.24.04.3+esm3?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.2-3build1",
        "5.4.2-4",
        "5.4.2-4ubuntu0.24.04.1",
        "5.4.2-4ubuntu0.24.04.2",
        "5.4.2-4ubuntu0.24.04.2+esm1",
        "5.4.2-4ubuntu0.24.04.3",
        "5.4.2-4ubuntu0.24.04.3+esm1",
        "5.4.2-4ubuntu0.24.04.3+esm2",
        "5.4.2-4ubuntu0.24.04.3+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "go-git",
            "binary_version": "5.16.2-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "golang-github-go-git-go-git-dev",
            "binary_version": "5.16.2-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "golang-github-go-git-go-git",
        "purl": "pkg:deb/ubuntu/golang-github-go-git-go-git@5.16.2-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.14.0-1",
        "5.16.2-1",
        "5.16.2-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "go-git is an extensible git implementation library written in pure Go. Prior to 5.19.2 and 6.0.0-alpha.5, worktree operations (including checkout, status, and add) resolve symbolic links inside the working tree without confining resolution to the worktree boundary, so a maliciously crafted repository containing a symlink can cause go-git to read from or write to files outside the intended working directory when the repository is cloned and its worktree operations are used. Versions 5.19.2 and 6.0.0-alpha.5.",
  "id": "UBUNTU-CVE-2026-71556",
  "modified": "2026-08-13T00:14:08Z",
  "published": "2026-08-07T17:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-71556"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71556"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-git/go-git/commit/008a78f2dd86f52544ddff8b8e8ddeecdf3f7aab"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-git/go-git/commit/661d1c7f101d34e002a3cfcf8dbea5b7421d07ac"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-git/go-git/releases/tag/v5.19.2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-git/go-git/releases/tag/v6.0.0-alpha.5"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-git/go-git/security/advisories/GHSA-hc8v-wwc9-vgxm"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-71556"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-71556 (GCVE-0-2026-71556)

RHSA-2026:66363

RHSA-2026:66421

RHSA-2026:68334

RHSA-2026:68335

UBUNTU-CVE-2026-71556 (CVE-2026-71556)

Tags

Sightings

Nomenclature

Related by attack behaviour