CVE-2026-59247

Estado: AplazadaAlta (7.6)—

Insufficient Verification of Data Authenticity vulnerability in Gleam allows an adversary in the middle to substitute forged Hex package contents during dependency resolution.

During dependency resolution Gleam fetches package metadata from the signature-verified Hex repository, which covers each release's dependency requirements and SHA-256 outer_checksum. After resolving versions, gleam_cli::dependencies::lookup_package makes a second request to the unsigned Hex API through gleam_core::hex::get_package_release and records the outer_checksum and dependency names from that JSON response into manifest.toml, instead of the values from the verified repository metadata. The Hex repository signature does not cover the API response.

Leer descripción completaMostrar menos

An adversary in the middle who can intercept TLS with a certificate trusted by the Gleam process (for example a TLS-inspecting proxy using a CA in the operating system trust store or added through GLEAM_CACERTS_PATH), and who can modify both the API release response and the corresponding repository tarball, can supply a package archive with a matching forged checksum without the Hex repository signing key. Gleam verifies the forged tarball against the forged checksum, accepts it, and extracts it as a dependency source, resulting in loss of integrity of the downloaded package contents.

Only projects that resolve or update Hex dependencies are affected, which happens when the manifest is missing, a dependency is added or updated, or dependency requirements change. Builds that reuse an unchanged, known-good manifest.toml continue to verify tarballs against its pinned checksum. This issue affects gleam: from 0.18.0 before 1.18.0.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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
Puntuación base: 7.6

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 7
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1557 Adversary-in-the-Middlecredential access · collection85 %
Impacto principalT1195.002 Compromise Software Supply Chaininitial access90 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact85 %

Adversario en el medio (AV:N, AT:P) intercepta TLS y falsifica contenidos de paquetes Hex durante resolución de dependencias. El ataque manipula el archivo del repositorio sin la clave de firma, comprometiendo la integridad de las dependencias descargadas (CWE-345: falta de verificación de autentici

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Encrypt Sensitive Information Vulnerability Scanning User Training Restrict File and Directory Permissions Remote Data Storage Network Segmentation

Tecnologías afectadas (1)

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

Lpil — Gleam^AI

CWE

CWE-345

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-59247",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59247",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-29T15:03:54.127187Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 7.6,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "PASSIVE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/gleam-lang/gleam",
          "vendor": "gleam-lang",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "product": "gleam",
          "versions": [
            {
              "status": "affected",
              "version": "0.18.0",
              "lessThan": "1.18.0",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:software-id/gleam.run/gleam",
          "packageName": "gleam.run/gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "collectionURL": "https://gleam.run",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/gleam-lang/gleam",
          "vendor": "gleam-lang",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "product": "gleam",
          "versions": [
            {
              "status": "affected",
              "version": "0.18.0",
              "lessThan": "1.18.0",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "8447b78cc844ff4aec44eea23dbd68d1fea11f11",
              "lessThan": "c9c0d48c123c8abae6db8dd61b25ccb427ed3d35",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/gleam-lang/gleam",
          "packageName": "gleam-lang/gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "vendor": "gleam-lang",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "product": "gleam",
          "versions": [
            {
              "status": "affected",
              "version": "v0.18.0-elixir",
              "lessThan": "v1.18.0-elixir",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-elixir-slim",
              "lessThan": "v1.18.0-elixir-slim",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-elixir-alpine",
              "lessThan": "v1.18.0-elixir-alpine",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-erlang",
              "lessThan": "v1.18.0-erlang",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-erlang-slim",
              "lessThan": "v1.18.0-erlang-slim",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-erlang-alpine",
              "lessThan": "v1.18.0-erlang-alpine",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-node",
              "lessThan": "v1.18.0-node",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-node-slim",
              "lessThan": "v1.18.0-node-slim",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v0.18.0-node-alpine",
              "lessThan": "v1.18.0-node-alpine",
              "versionType": "other"
            },
            {
              "status": "affected",
              "version": "v1.6.0-scratch",
              "lessThan": "v1.18.0-scratch",
              "versionType": "other"
            }
          ],
          "packageURL": "pkg:oci/gleam?repository_url=ghcr.io/gleam-lang",
          "packageName": "gleam-lang/gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "collectionURL": "https://ghcr.io",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-29T15:16:26.780",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-59247.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/gleam-lang/gleam/commit/c9c0d48c123c8abae6db8dd61b25ccb427ed3d35",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-4vvc-458m-r82g",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/hexpm/specifications/blob/main/registry-v2.md",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59247",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient Verification of Data Authenticity vulnerability in Gleam allows an adversary in the middle to substitute forged Hex package contents during dependency resolution.\n\nDuring dependency resolution Gleam fetches package metadata from the signature-verified Hex repository, which covers each release's dependency requirements and SHA-256 outer_checksum. After resolving versions, gleam_cli::dependencies::lookup_package makes a second request to the unsigned Hex API through gleam_core::hex::get_package_release and records the outer_checksum and dependency names from that JSON response into manifest.toml, instead of the values from the verified repository metadata. The Hex repository signature does not cover the API response.\n\nAn adversary in the middle who can intercept TLS with a certificate trusted by the Gleam process (for example a TLS-inspecting proxy using a CA in the operating system trust store or added through GLEAM_CACERTS_PATH), and who can modify both the API release response and the corresponding repository tarball, can supply a package archive with a matching forged checksum without the Hex repository signing key. Gleam verifies the forged tarball against the forged checksum, accepts it, and extracts it as a dependency source, resulting in loss of integrity of the downloaded package contents.\n\nOnly projects that resolve or update Hex dependencies are affected, which happens when the manifest is missing, a dependency is added or updated, or dependency requirements change. Builds that reuse an unchanged, known-good manifest.toml continue to verify tarballs against its pinned checksum. This issue affects gleam: from 0.18.0 before 1.18.0."
    }
  ],
  "lastModified": "2026-09-08T01:17:51.207",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}