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    2 vulnerabilities by gleam-lang

    CVE-2026-59247 (GCVE-0-2026-59247)

    Vulnerability from nvd – Published: 2026-07-29 14:24 – Updated: 2026-07-30 04:15
    VLAI
    Title
    Insufficient verification of Hex package metadata in Gleam
    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.
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-345 - Insufficient Verification of Data Authenticity
    Assigner
    EEF
    References
    Impacted products
    Vendor Product Version
    gleam-lang gleam Affected: 0.18.0 , < 1.18.0 (semver)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    gleam-lang gleam Affected: 0.18.0 , < 1.18.0 (semver)
    Affected: 8447b78cc844ff4aec44eea23dbd68d1fea11f11 , < c9c0d48c123c8abae6db8dd61b25ccb427ed3d35 (git)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    gleam-lang gleam Affected: v0.18.0-elixir , < v1.18.0-elixir (other)
    Affected: v0.18.0-elixir-slim , < v1.18.0-elixir-slim (other)
    Affected: v0.18.0-elixir-alpine , < v1.18.0-elixir-alpine (other)
    Affected: v0.18.0-erlang , < v1.18.0-erlang (other)
    Affected: v0.18.0-erlang-slim , < v1.18.0-erlang-slim (other)
    Affected: v0.18.0-erlang-alpine , < v1.18.0-erlang-alpine (other)
    Affected: v0.18.0-node , < v1.18.0-node (other)
    Affected: v0.18.0-node-slim , < v1.18.0-node-slim (other)
    Affected: v0.18.0-node-alpine , < v1.18.0-node-alpine (other)
    Affected: v1.6.0-scratch , < v1.18.0-scratch (other)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Credits
    John Downey John Downey Louis Pilfold
    Show details on NVD website
    To clipboard 

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    CVE-2026-59247 (GCVE-0-2026-59247)

    Vulnerability from cvelistv5 – Published: 2026-07-29 14:24 – Updated: 2026-07-30 04:15
    VLAI
    Title
    Insufficient verification of Hex package metadata in Gleam
    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.
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-345 - Insufficient Verification of Data Authenticity
    Assigner
    EEF
    References
    Impacted products
    Vendor Product Version
    gleam-lang gleam Affected: 0.18.0 , < 1.18.0 (semver)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    gleam-lang gleam Affected: 0.18.0 , < 1.18.0 (semver)
    Affected: 8447b78cc844ff4aec44eea23dbd68d1fea11f11 , < c9c0d48c123c8abae6db8dd61b25ccb427ed3d35 (git)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    gleam-lang gleam Affected: v0.18.0-elixir , < v1.18.0-elixir (other)
    Affected: v0.18.0-elixir-slim , < v1.18.0-elixir-slim (other)
    Affected: v0.18.0-elixir-alpine , < v1.18.0-elixir-alpine (other)
    Affected: v0.18.0-erlang , < v1.18.0-erlang (other)
    Affected: v0.18.0-erlang-slim , < v1.18.0-erlang-slim (other)
    Affected: v0.18.0-erlang-alpine , < v1.18.0-erlang-alpine (other)
    Affected: v0.18.0-node , < v1.18.0-node (other)
    Affected: v0.18.0-node-slim , < v1.18.0-node-slim (other)
    Affected: v0.18.0-node-alpine , < v1.18.0-node-alpine (other)
    Affected: v1.6.0-scratch , < v1.18.0-scratch (other)
        cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Credits
    John Downey John Downey Louis Pilfold
    Show details on NVD website
    To clipboard 

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                  "vulnerable": true
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "John Downey"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "John Downey"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Louis Pilfold"
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      ],
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          "supportingMedia": [
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              "value": "Insufficient Verification of Data Authenticity vulnerability in Gleam allows an adversary in the middle to substitute forged Hex package contents during dependency resolution.\u003cp\u003eDuring dependency resolution Gleam fetches package metadata from the signature-verified Hex repository, which covers each release\u0027s dependency requirements and SHA-256 \u003ctt\u003eouter_checksum\u003c/tt\u003e. After resolving versions, \u003ctt\u003egleam_cli::dependencies::lookup_package\u003c/tt\u003e makes a second request to the unsigned Hex API through \u003ctt\u003egleam_core::hex::get_package_release\u003c/tt\u003e and records the \u003ctt\u003eouter_checksum\u003c/tt\u003e and dependency names from that JSON response into \u003ctt\u003emanifest.toml\u003c/tt\u003e, instead of the values from the verified repository metadata. The Hex repository signature does not cover the API response.\u003c/p\u003e\u003cp\u003eAn 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 \u003ctt\u003eGLEAM_CACERTS_PATH\u003c/tt\u003e), 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.\u003c/p\u003e\u003cp\u003eOnly 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 \u003ctt\u003emanifest.toml\u003c/tt\u003e continue to verify tarballs against its pinned checksum. This issue affects gleam: from 0.18.0 before 1.18.0.\u003c/p\u003e"
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          "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."
        }
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      "impacts": [
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          "capecId": "CAPEC-94",
          "descriptions": [
            {
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              "value": "CAPEC-94 Adversary in the Middle (AiTM)"
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        },
        {
          "capecId": "CAPEC-185",
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              "value": "CAPEC-185 Malicious Software Download"
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      "metrics": [
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            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345 Insufficient Verification of Data Authenticity",
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              "type": "CWE"
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          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-30T04:15:30.182Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
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      "references": [
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          "tags": [
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            "related"
          ],
          "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-4vvc-458m-r82g"
        },
        {
          "tags": [
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          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-59247.html"
        },
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          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59247"
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            "patch"
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          "url": "https://github.com/gleam-lang/gleam/commit/c9c0d48c123c8abae6db8dd61b25ccb427ed3d35"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://github.com/hexpm/specifications/blob/main/registry-v2.md"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "Insufficient verification of Hex package metadata in Gleam",
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    "datePublished": "2026-07-29T14:24:55.499Z",
    "dateReserved": "2026-07-04T04:24:03.652Z",
    "dateUpdated": "2026-07-30T04:15:30.182Z",
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