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CVE-2026-33693

Estado: AplazadaMedia (6.5)—

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the `v4_is_invalid()` function in `activitypub-federation-rust` (`src/utils.rs`) does not check for `Ipv4Addr::UNSPECIFIED` (0.0.0.0). An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 (GHSA-7723-35v7-qcxw), and reach localhost services on the target server. Version 0.7.0-beta.9 patches the issue.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Activitypub-federation-rust — Activitypub-federation-rustAIJoin-lemmy — LemmyAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-33693",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-33693",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-30T11:50:59.456186Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "LemmyNet",
          "product": "lemmy",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.7.0-beta.9"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-27T01:16:18.983",
  "references": [
    {
      "url": "https://github.com/LemmyNet/activitypub-federation-rust/commit/4ae8532b17bc35755240b7f55d4a5b7665351599",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/LemmyNet/lemmy/security/advisories/GHSA-q537-8fr5-cw35",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/advisories/GHSA-7723-35v7-qcxw",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the `v4_is_invalid()` function in `activitypub-federation-rust` (`src/utils.rs`) does not check for `Ipv4Addr::UNSPECIFIED` (0.0.0.0). An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 (GHSA-7723-35v7-qcxw), and reach localhost services on the target server. Version 0.7.0-beta.9 patches the issue."
    },
    {
      "lang": "es",
      "value": "Lemmy es un agregador de enlaces y un foro para el fediverso. Antes de la versión 0.7.0-beta.9, la función `v4_is_invalid()` de `activitypub-federation-rust` (`src/utils.rs`) no comprueba si existe `Ipv4Addr::UNSPECIFIED` (0.0.0.0). Un atacante no autenticado que controle un dominio remoto puede apuntarlo a 0.0.0.0, eludir la protección SSRF introducida por la corrección para CVE-2025-25194 (GHSA-7723-35v7-qcxw) y acceder a los servicios de localhost en el servidor de destino. La versión 0.7.0-beta.9 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:37:56.163",
  "sourceIdentifier": "security-advisories@github.com"
}