FKIE_CVE-2026-73291

Vulnerability from fkie_nvd - Published: 2026-08-12 15:18 - Updated: 2026-08-13 17:17
Severity
7.1 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
Summary
Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.4.0, Seerr's ImageProxy in server/lib/imageproxy.ts uses the upstream ETag and Content-Type response headers to build a cache filename for the unauthenticated GET /avatarproxy/:jellyfinUserId route, allowing a malicious or compromised Jellyfin or Emby server, or a man-in-the-middle attacker on a plaintext media-server connection, to supply traversal sequences that path.join and fs.writeFile normalize outside the cache directory, overwrite /app/dist/index.js or other files, and execute code as the node user after a container restart. This issue is fixed in version 3.4.0.
References
security-advisories@github.comhttps://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2
security-advisories@github.comhttps://github.com/seerr-team/seerr/releases/tag/v3.4.0
security-advisories@github.comhttps://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "seerr",
          "vendor": "seerr-team",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.4.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.4.0, Seerr\u0027s ImageProxy in server/lib/imageproxy.ts uses the upstream ETag and Content-Type response headers to build a cache filename for the unauthenticated GET /avatarproxy/:jellyfinUserId route, allowing a malicious or compromised Jellyfin or Emby server, or a man-in-the-middle attacker on a plaintext media-server connection, to supply traversal sequences that path.join and fs.writeFile normalize outside the cache directory, overwrite /app/dist/index.js or other files, and execute code as the node user after a container restart. This issue is fixed in version 3.4.0."
    }
  ],
  "id": "CVE-2026-73291",
  "lastModified": "2026-08-13T17:17:36.260",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73291",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-13T16:22:56.578886Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-12T15:18:33.020",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/seerr-team/seerr/releases/tag/v3.4.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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