Vulnerability-Lookup

GHSA-6269-2Q48-XXQM

Vulnerability from github – Published: 2026-08-06 15:32 – Updated: 2026-08-06 15:32

Details

LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.

Severity

5.9 (Medium)


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

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-70637"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-820"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-06T15:17:27Z",
    "severity": "HIGH"
  },
  "details": "LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.",
  "id": "GHSA-6269-2q48-xxqm",
  "modified": "2026-08-06T15:32:49Z",
  "published": "2026-08-06T15:32:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70637"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hfiref0x/LightFTP/issues/75"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-70637 (GCVE-0-2026-70637)

Vulnerability from cvelistv5 – Published: 2026-08-06 14:15 – Updated: 2026-08-06 17:24 X_Open Source

Title

LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c

Summary

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

5.9 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-820 - Missing Synchronization

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/hfiref0x/LightFTP/issues/75	technical-descriptionexploit
https://www.vulncheck.com/advisories/lightftp-dat…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
hfiref0x	LightFTP	Affected: 0 , ≤ 2.4 (custom) Affected: 0 , ≤ d28c5e08aa4bd128737d35cc6ee0f9630a910ed5 (git)

Date Public

2026-06-22 00:00

Credits

grant_Y (@grant-yim) Gjoko Krstic of Zero Science Lab

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JSON

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                "id": "CVE-2026-70637",
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-06T17:23:07.775022Z",
                "version": "2.0.3"
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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.

Action not permitted

GHSA-6269-2Q48-XXQM

CVE-2026-70637 (GCVE-0-2026-70637)

Tags

Sightings

Nomenclature