FKIE_CVE-2026-59247

Vulnerability from fkie_nvd - Published: 2026-07-29 15:16 - Updated: 2026-07-30 19:14
Severity
7.6 (High) - 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
Summary
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. 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.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-59247.html
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/gleam-lang/gleam/commit/c9c0d48c123c8abae6db8dd61b25ccb427ed3d35
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/gleam-lang/gleam/security/advisories/GHSA-4vvc-458m-r82g
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/hexpm/specifications/blob/main/registry-v2.md
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-59247
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://gleam.run",
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "packageName": "gleam.run/gleam",
          "packageURL": "pkg:sid/gleam.run/gleam",
          "product": "gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ],
          "repo": "https://github.com/gleam-lang/gleam",
          "vendor": "gleam-lang",
          "versions": [
            {
              "lessThan": "1.18.0",
              "status": "affected",
              "version": "0.18.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "packageName": "gleam-lang/gleam",
          "packageURL": "pkg:github/gleam-lang/gleam",
          "product": "gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ],
          "repo": "https://github.com/gleam-lang/gleam",
          "vendor": "gleam-lang",
          "versions": [
            {
              "lessThan": "1.18.0",
              "status": "affected",
              "version": "0.18.0",
              "versionType": "semver"
            },
            {
              "lessThan": "c9c0d48c123c8abae6db8dd61b25ccb427ed3d35",
              "status": "affected",
              "version": "8447b78cc844ff4aec44eea23dbd68d1fea11f11",
              "versionType": "git"
            }
          ]
        },
        {
          "collectionURL": "https://ghcr.io",
          "cpes": [
            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "gleam_cli::dependencies",
            "gleam_cli::dependencies::dependency_manager"
          ],
          "packageName": "gleam-lang/gleam",
          "packageURL": "pkg:oci/gleam?repository_url=ghcr.io/gleam-lang",
          "product": "gleam",
          "programFiles": [
            "compiler-cli/src/dependencies.rs",
            "compiler-cli/src/dependencies/dependency_manager.rs"
          ],
          "programRoutines": [
            {
              "name": "gleam_cli::dependencies::lookup_package"
            },
            {
              "name": "gleam_cli::dependencies::dependency_manager::DependencyManager::perform_version_resolution"
            }
          ],
          "vendor": "gleam-lang",
          "versions": [
            {
              "lessThan": "v1.18.0-elixir",
              "status": "affected",
              "version": "v0.18.0-elixir",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-elixir-slim",
              "status": "affected",
              "version": "v0.18.0-elixir-slim",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-elixir-alpine",
              "status": "affected",
              "version": "v0.18.0-elixir-alpine",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-erlang",
              "status": "affected",
              "version": "v0.18.0-erlang",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-erlang-slim",
              "status": "affected",
              "version": "v0.18.0-erlang-slim",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-erlang-alpine",
              "status": "affected",
              "version": "v0.18.0-erlang-alpine",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-node",
              "status": "affected",
              "version": "v0.18.0-node",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-node-slim",
              "status": "affected",
              "version": "v0.18.0-node-slim",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-node-alpine",
              "status": "affected",
              "version": "v0.18.0-node-alpine",
              "versionType": "other"
            },
            {
              "lessThan": "v1.18.0-scratch",
              "status": "affected",
              "version": "v1.6.0-scratch",
              "versionType": "other"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-59247",
  "lastModified": "2026-07-30T19:14:09.213",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.6,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59247",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-29T15:03:54.127187Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-29T15:16:26.780",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "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"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.