CVE-2026-59247 (GCVE-0-2026-59247)
Vulnerability from cvelistv5 – Published: 2026-07-29 14:24 – Updated: 2026-07-30 04:15
VLAI
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/gleam-lang/gleam/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59247.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59247 | related |
| https://github.com/gleam-lang/gleam/commit/c9c0d4… | patch |
| https://github.com/hexpm/specifications/blob/main… | related |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| gleam-lang | gleam |
Affected:
0.18.0 , < 1.18.0
(semver)
cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* |
|
| gleam-lang | gleam |
Affected:
0.18.0 , < 1.18.0
(semver)
Affected: 8447b78cc844ff4aec44eea23dbd68d1fea11f11 , < c9c0d48c123c8abae6db8dd61b25ccb427ed3d35 (git) cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* |
|
| 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:*:*:*:*:*:*:*:* |
Credits
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"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-30T16:36:41Z",
"cve": "CVE-2026-59247",
"id": "CVE-2026-59247",
"initial_release_date": "2026-07-30T16:36:41Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-59247",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-59247.json",
"version": "2"
},
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\"https://osv.dev/vulnerability/EEF-CVE-2026-59247\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/gleam-lang/gleam/commit/c9c0d48c123c8abae6db8dd61b25ccb427ed3d35\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/hexpm/specifications/blob/main/registry-v2.md\", \"tags\": [\"related\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"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. 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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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"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\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-345\", \"description\": \"CWE-345 Insufficient Verification of Data Authenticity\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.18.0\", \"versionStartIncluding\": \"0.18.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-07-29T14:24:55.499Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-59247\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-29T15:09:39.613Z\", \"dateReserved\": \"2026-07-04T04:24:03.652Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-07-29T14:24:55.499Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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