PYSEC-2026-2521

Vulnerability from pysec - Published: 2026-07-13 15:02 - Updated: 2026-07-13 16:04
VLAI
Details

A flaw was found in InstructLab. A local attacker could exploit a path traversal vulnerability in the chat session handler by manipulating the logs_dir parameter. This allows the attacker to create new directories and write files to arbitrary locations on the system, potentially leading to unauthorized data modification or disclosure.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Impacted products
Name purl
instructlab pkg:pypi/instructlab
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "instructlab",
        "purl": "pkg:pypi/instructlab"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.26.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.14.0",
        "0.15.1",
        "0.16.0",
        "0.16.1",
        "0.17.0",
        "0.17.1",
        "0.17.2",
        "0.18.0",
        "0.18.0a1",
        "0.18.0a2",
        "0.18.0a3",
        "0.18.0a4",
        "0.18.0a5",
        "0.18.0a6",
        "0.18.0a7",
        "0.18.0b1",
        "0.18.0b2",
        "0.18.0b3",
        "0.18.0b4",
        "0.18.0b5",
        "0.18.0b6",
        "0.18.0rc1",
        "0.18.0rc2",
        "0.18.0rc3",
        "0.18.0rc4",
        "0.18.0rc5",
        "0.18.0rc6",
        "0.18.0rc7",
        "0.18.1",
        "0.18.2",
        "0.18.3",
        "0.18.4",
        "0.19.0",
        "0.19.0a1",
        "0.19.0b1",
        "0.19.0rc1",
        "0.19.1",
        "0.19.2",
        "0.19.3",
        "0.19.4",
        "0.19.5",
        "0.20.0",
        "0.20.0a1",
        "0.20.0a2",
        "0.20.1",
        "0.21.0",
        "0.21.0a0",
        "0.21.0a1",
        "0.21.1",
        "0.21.2",
        "0.22.0",
        "0.22.1",
        "0.22.2",
        "0.23.0",
        "0.23.0a0",
        "0.23.0rc0",
        "0.23.1",
        "0.23.2",
        "0.23.3",
        "0.23.4",
        "0.23.5",
        "0.24.0",
        "0.24.1",
        "0.24.2",
        "0.24.2a0",
        "0.24.3",
        "0.25",
        "0.26.0",
        "0.26.0a1",
        "0.26.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-6855",
    "GHSA-pqmg-c2j8-fq92"
  ],
  "details": "A flaw was found in InstructLab. A local attacker could exploit a path traversal vulnerability in the chat session handler by manipulating the `logs_dir` parameter. This allows the attacker to create new directories and write files to arbitrary locations on the system, potentially leading to unauthorized data modification or disclosure.",
  "id": "PYSEC-2026-2521",
  "modified": "2026-07-13T16:04:19.624614Z",
  "published": "2026-07-13T15:02:52.619367Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6855"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-6855"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460013"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/instructlab/instructlab"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/instructlab"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pqmg-c2j8-fq92"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "InstructLab vulnerable to Path Traversal"
}



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