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EUVD-2026-364392

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:32

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:32:21.255483+00:00",
  "id": "EUVD-2026-364392"
}

CVE-2026-42795 (GCVE-0-2026-42795)

Vulnerability from cvelistv5 – Published: 2026-06-02 13:41 – Updated: 2026-09-08 01:05

Title

Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root

Summary

Symlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball. The file collection helpers (gleam_files, native_files, private_files) in compiler-cli/src/fs.rs use follow_links(true) when walking publishable directories such as src/ and priv/. The collected paths are added to the package archive via add_path_to_tar in compiler-cli/src/publish.rs without verifying that the resolved target remains within the project root. A symlink placed under a publishable directory will cause gleam export hex-tarball or gleam publish to embed the contents of the symlink target into the generated Hex package. An attacker with write access to the project repository can place a symlink in src/ or priv/ pointing to an arbitrary file. When a maintainer or CI pipeline runs gleam publish or gleam export hex-tarball, local files readable by the publisher (such as secrets, tokens, or SSH keys) are silently embedded into the published package artifact. This issue affects Gleam from 0.10.0-rc1 until 1.17.0.

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-02 15:04 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

EEF mitre root Scorecard

References

4 references

URL	Tags
https://github.com/gleam-lang/gleam/security/advi…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-42795.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-42795	related
https://github.com/gleam-lang/gleam/commit/6435a5…	patch

Impacted products

3 products

Vendor	Product	Version
Gleam	Gleam	Affected: 0.10.0-rc1 , < 1.17.0 (semver) cpe:2.3:a:gleam-lang:gleam::::::::
Gleam	Gleam	Affected: 0.10.0-rc1 , < 1.17.0 (semver) Affected: c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c , < 6435a5528b9ae0449e2f32be579641ec485f6866 (git) cpe:2.3:a:gleam-lang:gleam::::::::
Gleam	Gleam	Affected: v0.10.0-rc1-elixir , < v1.17.0-elixir (other) Affected: v0.10.0-rc1-erlang , < v1.17.0-erlang (other) Affected: v0.10.0-rc1-node , < v1.17.0-node (other) Affected: v0.10.0-rc1-node-slim , < v1.17.0-node-slim (other) Affected: v0.10.0-rc1-elixir-slim , < v1.17.0-elixir-slim (other) Affected: v0.10.0-rc1-erlang-slim , < v1.17.0-erlang-slim (other) Affected: v0.10.0-rc1-erlang-alpine , < v1.17.0-erlang-alpine (other) Affected: v0.10.0-rc1-elixir-alpine , < v1.17.0-elixir-alpine (other) Affected: v0.10.0-rc1-node-alpine , < v1.17.0-node-alpine (other) Affected: v0.10.0-rc1-scratch , < v1.17.0-scratch (other) cpe:2.3:a:gleam-lang:gleam::::::::

Credits

Aly (spect3r1) Abdelrahman Ahmed Aboelkasem (0x2face) Louis Pilfold Jonatan Männchen / EEF

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42795",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T15:04:06.195456Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-02T15:04:35.767Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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            "tags": [
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            ],
            "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-qhh5-fg4c-8gqc"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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            "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"
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            "compiler-cli"
          ],
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          "packageURL": "pkg:software-id/gleam.run/gleam",
          "product": "Gleam",
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            "compiler-cli/src/publish.rs"
          ],
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            },
            {
              "name": "compiler_cli::fs::native_files"
            },
            {
              "name": "compiler_cli::fs::private_files"
            },
            {
              "name": "compiler_cli::publish::project_files"
            },
            {
              "name": "compiler_cli::publish::add_path_to_tar"
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          ],
          "vendor": "Gleam",
          "versions": [
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              "status": "affected",
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        },
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          "repo": "https://github.com/gleam-lang/gleam",
          "vendor": "Gleam",
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              "status": "affected",
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              "status": "affected",
              "version": "c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c",
              "versionType": "git"
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          "modules": [
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          "packageName": "gleam-lang/gleam",
          "packageURL": "pkg:oci/gleam?repository_url=ghcr.io/gleam-lang",
          "product": "Gleam",
          "programFiles": [
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          ],
          "programRoutines": [
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            },
            {
              "name": "compiler_cli::fs::native_files"
            },
            {
              "name": "compiler_cli::fs::private_files"
            },
            {
              "name": "compiler_cli::publish::project_files"
            },
            {
              "name": "compiler_cli::publish::add_path_to_tar"
            }
          ],
          "vendor": "Gleam",
          "versions": [
            {
              "lessThan": "v1.17.0-elixir",
              "status": "affected",
              "version": "v0.10.0-rc1-elixir",
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            },
            {
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              "status": "affected",
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              "versionType": "other"
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            {
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              "status": "affected",
              "version": "v0.10.0-rc1-erlang-slim",
              "versionType": "other"
            },
            {
              "lessThan": "v1.17.0-erlang-alpine",
              "status": "affected",
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              "versionType": "other"
            },
            {
              "lessThan": "v1.17.0-elixir-alpine",
              "status": "affected",
              "version": "v0.10.0-rc1-elixir-alpine",
              "versionType": "other"
            },
            {
              "lessThan": "v1.17.0-node-alpine",
              "status": "affected",
              "version": "v0.10.0-rc1-node-alpine",
              "versionType": "other"
            },
            {
              "lessThan": "v1.17.0-scratch",
              "status": "affected",
              "version": "v0.10.0-rc1-scratch",
              "versionType": "other"
            }
          ]
        }
      ],
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              "negate": false,
              "operator": "OR"
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      "credits": [
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          "type": "finder",
          "value": "Aly (spect3r1)"
        },
        {
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          "type": "finder",
          "value": "Abdelrahman Ahmed Aboelkasem (0x2face)"
        },
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          "type": "remediation developer",
          "value": "Louis Pilfold"
        },
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          "type": "analyst",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
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          "supportingMedia": [
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              "value": "\u003cp\u003eSymlink following vulnerability in Gleam\u0027s Hex package export allows files outside the project root to be embedded in the generated package tarball.\u003c/p\u003e\u003cp\u003eThe file collection helpers (\u003ctt\u003egleam_files\u003c/tt\u003e, \u003ctt\u003enative_files\u003c/tt\u003e, \u003ctt\u003eprivate_files\u003c/tt\u003e) in \u003ctt\u003ecompiler-cli/src/fs.rs\u003c/tt\u003e use \u003ctt\u003efollow_links(true)\u003c/tt\u003e when walking publishable directories such as \u003ctt\u003esrc/\u003c/tt\u003e and \u003ctt\u003epriv/\u003c/tt\u003e. The collected paths are added to the package archive via \u003ctt\u003eadd_path_to_tar\u003c/tt\u003e in \u003ctt\u003ecompiler-cli/src/publish.rs\u003c/tt\u003e without verifying that the resolved target remains within the project root. A symlink placed under a publishable directory will cause \u003ctt\u003egleam export hex-tarball\u003c/tt\u003e or \u003ctt\u003egleam publish\u003c/tt\u003e to embed the contents of the symlink target into the generated Hex package.\u003c/p\u003e\u003cp\u003eAn attacker with write access to the project repository can place a symlink in \u003ctt\u003esrc/\u003c/tt\u003e or \u003ctt\u003epriv/\u003c/tt\u003e pointing to an arbitrary file. When a maintainer or CI pipeline runs \u003ctt\u003egleam publish\u003c/tt\u003e or \u003ctt\u003egleam export hex-tarball\u003c/tt\u003e, local files readable by the publisher (such as secrets, tokens, or SSH keys) are silently embedded into the published package artifact.\u003c/p\u003e\u003cp\u003eThis issue affects Gleam from 0.10.0-rc1 until 1.17.0.\u003c/p\u003e"
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      "title": "Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root",
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}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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EUVD-2026-364392

CVE-2026-42795 (GCVE-0-2026-42795)

Tags

Sightings

Nomenclature

Related by attack behaviour