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CVE-2026-43965— Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion

Quick assessment

Affected
Gleam Gleam
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gleam是Gleam开源的一个类型安全的可扩展系统构建语言。 Gleam 0.18.0-rc1版本至1.17.0版本存在安全漏洞，该漏洞源于路径遍历问题，可能导致通过恶意build/packages/packages.toml内容删除任意目录。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.15% · P5

Affected Version Matrix 13

VendorProduct Version RangeStatus
Gleam Gleam 0.18.0-rc1< 1.17.0 affected
0.18.0-rc1< 1.17.0 affected
ed7aec0484f10d60978b63788c8a6497590855ab< 690ca069817bee5f77a28fc3e360627c1da19291 affected
v0.18.0-rc1-elixir< v1.17.0-elixir affected
v0.18.0-rc1-erlang< v1.17.0-erlang affected
v0.18.0-rc1-node< v1.17.0-node affected
v0.18.0-rc1-node-slim< v1.17.0-node-slim affected
v0.18.0-rc1-elixir-slim< v1.17.0-elixir-slim affected
… +5 more rows
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I. Basic Information for CVE-2026-43965

Vulnerability Information
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Vulnerability Title
Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion
Source: CVE Program / CVE List V5
Vulnerability Description
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 until 1.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
gleam 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gleam是Gleam开源的一个类型安全的可扩展系统构建语言。 Gleam 0.18.0-rc1版本至1.17.0版本存在安全漏洞，该漏洞源于路径遍历问题，可能导致通过恶意build/packages/packages.toml内容删除任意目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gleam Gleam 0.18.0-rc1 ~ 1.17.0 cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
Gleam Gleam 0.18.0-rc1 ~ 1.17.0 cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
Gleam Gleam v0.18.0-rc1-elixir ~ v1.17.0-elixir cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-43965

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III. Intelligence Information for CVE-2026-43965

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Patches & Fixes for CVE-2026-43965 (1)

Vendor Advisories for CVE-2026-43965 (3)

Same Patch Batch · Gleam · 2026-06-02 · 3 CVEs total

CVE-2026-42795 Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root
CVE-2026-32685 Path Traversal in gleam docs build via documentation.pages Allows Arbitrary File Read and

IV. Related Vulnerabilities

Same product: Gleam
Same vendor: Gleam
Same weakness: CWE-22

V. Comments for CVE-2026-43965

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