PYSEC-2026-3052

Vulnerability from pysec - Published: 2026-07-13 14:36 - Updated: 2026-07-13 16:06
VLAI
Details

An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies.

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "richie",
        "purl": "pkg:pypi/richie"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "1.0.0",
        "1.0.0b0",
        "1.0.0b1",
        "1.0.0b2",
        "1.0.0b3",
        "1.0.0b4",
        "1.0.0b5",
        "1.0.0b6",
        "1.0.0b7",
        "1.0.0b8",
        "1.0.0b9",
        "1.0.1",
        "1.1.0",
        "1.10.0",
        "1.11.0",
        "1.12.0",
        "1.12.1",
        "1.13.0",
        "1.14.0",
        "1.14.1",
        "1.15.0",
        "1.16.0",
        "1.16.1",
        "1.16.2",
        "1.17.0",
        "1.2.0",
        "1.3.0",
        "1.4.0",
        "1.4.1",
        "1.5.0",
        "1.5.1",
        "1.5.2",
        "1.6.0",
        "1.6.1",
        "1.7.0",
        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.8.0",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.9.0",
        "1.9.1",
        "1.9.2",
        "2.0.0",
        "2.0.0b0",
        "2.0.0b1",
        "2.0.0b11",
        "2.0.0b12",
        "2.0.0b13",
        "2.0.0b14",
        "2.0.0b15",
        "2.0.0b16",
        "2.0.0b17",
        "2.0.0b18",
        "2.0.0b19",
        "2.0.0b2",
        "2.0.0b20",
        "2.0.0b21",
        "2.0.0b22",
        "2.0.0b3",
        "2.0.0b4",
        "2.0.0b5",
        "2.0.0b6",
        "2.0.0b7",
        "2.0.0b8",
        "2.0.0b9",
        "2.0.1",
        "2.1.0",
        "2.10.0",
        "2.11.0",
        "2.12.0",
        "2.13.0",
        "2.14.0",
        "2.14.1",
        "2.15.0",
        "2.15.1",
        "2.16.0",
        "2.17.0",
        "2.18.0",
        "2.19.0",
        "2.2.0",
        "2.20.0",
        "2.20.1",
        "2.21.0",
        "2.21.1",
        "2.22.0",
        "2.23.0",
        "2.24.0",
        "2.24.1",
        "2.25.0",
        "2.25.1",
        "2.26.0",
        "2.27.0",
        "2.28.0",
        "2.28.1",
        "2.29.0",
        "2.29.1",
        "2.29.2",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.30.0",
        "2.31.0",
        "2.32.0",
        "2.33.0",
        "2.34.0",
        "2.4.0",
        "2.5.0",
        "2.6.0",
        "2.7.0",
        "2.7.1",
        "2.8.0",
        "2.8.1",
        "2.8.2",
        "2.9.0",
        "2.9.1",
        "3.0.0",
        "3.0.0b0",
        "3.1.0",
        "3.1.1",
        "3.1.2",
        "3.2.0",
        "3.2.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26717",
    "GHSA-xjhr-fm27-4hmx"
  ],
  "details": "An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies.",
  "id": "PYSEC-2026-3052",
  "modified": "2026-07-13T16:06:10.309189Z",
  "published": "2026-07-13T14:36:38.520323Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26717"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Rickidevs/CVE-2026-26717"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openfun/richie"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/richie"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-xjhr-fm27-4hmx"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function"
}



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