CVE-2026-43965 (GCVE-0-2026-43965)
Vulnerability from cvelistv5 – Published: 2026-06-02 13:41 – Updated: 2026-11-10 19:19
VLAI
EPSS
VEX
Title
Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion
Summary
Path traversal vulnerability in Gleam's dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content.
Package keys read from build/packages/packages.toml by LocalPackages::read_from_disc are passed without validation to paths.build_packages_package(), which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to fs::delete_directory (which calls remove_dir_all). No check is performed to ensure the path remains within the intended build/packages/ directory. Both absolute paths and relative traversal sequences (e.g. ../) are accepted as package keys, allowing deletion of arbitrary directories.
An attacker who can cause a victim to run gleam deps download on a project containing a malicious build/packages/packages.toml (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim's system to be recursively deleted.
This issue affects gleam: from 0.18.0-rc1 before 1.17.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 15:07 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/gleam-lang/gleam/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-43965.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-43965 | related |
| https://github.com/gleam-lang/gleam/commit/ed7aec… | related |
| https://github.com/gleam-lang/gleam/commit/690ca0… | patch |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Gleam | Gleam |
Affected:
0.18.0-rc1 , < 1.17.0
(semver)
cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* |
||
| Gleam | Gleam |
Affected:
v0.18.0-rc1-elixir , < v1.17.0-elixir
(other)
Affected: v0.18.0-rc1-erlang , < v1.17.0-erlang (other) Affected: v0.18.0-rc1-node , < v1.17.0-node (other) Affected: v0.18.0-rc1-node-slim , < v1.17.0-node-slim (other) Affected: v0.18.0-rc1-elixir-slim , < v1.17.0-elixir-slim (other) Affected: v0.18.0-rc1-erlang-slim , < v1.17.0-erlang-slim (other) Affected: v0.18.0-rc1-erlang-alpine , < v1.17.0-erlang-alpine (other) Affected: v0.18.0-rc1-elixir-alpine , < v1.17.0-elixir-alpine (other) Affected: v0.18.0-rc1-node-alpine , < v1.17.0-node-alpine (other) Affected: v0.18.0-rc1-scratch , < v1.17.0-scratch (other) cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* |
||
| Gleam | Gleam |
Affected:
ed7aec0484f10d60978b63788c8a6497590855ab , < 690ca069817bee5f77a28fc3e360627c1da19291
(git)
cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* |
Date Public
2026-06-02 13:41
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"value": "Una vulnerabilidad de salto de ruta en la gesti\u00f3n de dependencias de Gleam permite la eliminaci\u00f3n arbitraria de directorios a trav\u00e9s de contenido malicioso en build/packages/packages.toml.\n\nLas claves de paquete le\u00eddas de build/packages/packages.toml por LocalPackages::read_from_disc se pasan sin validaci\u00f3n a paths.build_packages_package(), que construye una ruta del sistema de archivos uniendo el directorio de compilaci\u00f3n del proyecto con la clave controlada por el atacante. La ruta resultante se pasa luego a fs::delete_directory (que llama a remove_dir_all). No se realiza ninguna comprobaci\u00f3n para asegurar que la ruta permanezca dentro del directorio build/packages/ previsto. Tanto las rutas absolutas como las secuencias de salto relativas (p. ej., rutas relativas ../) se aceptan como claves de paquete, permitiendo la eliminaci\u00f3n de directorios arbitrarios.\n\nUn atacante que puede hacer que una v\u00edctima ejecute gleam deps download en un proyecto que contenga un build/packages/packages.toml malicioso (p. ej., al confirmar el archivo normalmente ignorado por Git en un repositorio) puede hacer que se eliminen recursivamente directorios arbitrarios en el sistema de la v\u00edctima.\n\nEste problema afecta a Gleam desde la versi\u00f3n 0.18.0-rc1 hasta la 1.17.0."
}
],
"id": "CVE-2026-43965",
"lastModified": "2026-11-10T20:19:11.907",
"metrics": {
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"product_status:known_not_affected": "1",
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"title": "Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43965.json",
"version": "3"
},
"vulnrichment": {
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"url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3"
}
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"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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{
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"credits": [
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"type": "finder",
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},
{
"lang": "en",
"type": "finder",
"value": "Abdelrahman Ahmed Aboelkasem (0x2face)"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Louis Pilfold"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"datePublic": "2026-06-02T13:41:37.000Z",
"descriptions": [
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"value": "\u003cp\u003ePath traversal vulnerability in Gleam\u0027s dependency management allows arbitrary directory deletion via malicious \u003ccode\u003ebuild/packages/packages.toml\u003c/code\u003e content.\u003c/p\u003e\n\u003cp\u003ePackage keys read from \u003ccode\u003ebuild/packages/packages.toml\u003c/code\u003e by \u003ccode\u003eLocalPackages::read_from_disc\u003c/code\u003e are passed without validation to \u003ccode\u003epaths.build_packages_package()\u003c/code\u003e, which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to \u003ccode\u003efs::delete_directory\u003c/code\u003e (which calls \u003ccode\u003eremove_dir_all\u003c/code\u003e). No check is performed to ensure the path remains within the intended \u003ccode\u003ebuild/packages/\u003c/code\u003e directory. Both absolute paths and relative traversal sequences (e.g. \u003ccode\u003e../\u003c/code\u003e) are accepted as package keys, allowing deletion of arbitrary directories.\u003c/p\u003e\n\u003cp\u003eAn attacker who can cause a victim to run \u003ccode\u003egleam deps download\u003c/code\u003e on a project containing a malicious \u003ccode\u003ebuild/packages/packages.toml\u003c/code\u003e (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim\u0027s system to be recursively deleted.\u003c/p\u003e\n\u003cp\u003eThis issue affects gleam: from 0.18.0-rc1 before 1.17.0.\u003c/p\u003e"
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"title": "Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion"
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}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
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.
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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.