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CVE-2026-42795— Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root

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 0.10.0-rc1版本至1.17.0版本存在安全漏洞，该漏洞源于符号链接跟随问题，可能导致项目根目录外的文件被嵌入生成的包tarball中。

AI Predicted 5.5 Difficulty: Easy EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation

Affected Version Matrix 13

VendorProduct Version RangeStatus
Gleam Gleam 0.10.0-rc1< 1.17.0 affected
0.10.0-rc1< 1.17.0 affected
c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c< 6435a5528b9ae0449e2f32be579641ec485f6866 affected
v0.10.0-rc1-elixir< v1.17.0-elixir affected
v0.10.0-rc1-erlang< v1.17.0-erlang affected
v0.10.0-rc1-node< v1.17.0-node affected
v0.10.0-rc1-node-slim< v1.17.0-node-slim affected
v0.10.0-rc1-elixir-slim< v1.17.0-elixir-slim affected
… +5 more rows
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I. Basic Information for CVE-2026-42795

Vulnerability Information
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Vulnerability Title
Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
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 0.10.0-rc1版本至1.17.0版本存在安全漏洞，该漏洞源于符号链接跟随问题，可能导致项目根目录外的文件被嵌入生成的包tarball中。
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 0.10.0-rc1 ~ 1.17.0 cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
Gleam Gleam 0.10.0-rc1 ~ 1.17.0 cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
Gleam Gleam v0.10.0-rc1-elixir ~ v1.17.0-elixir cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-42795

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III. Intelligence Information for CVE-2026-42795

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Patches & Fixes for CVE-2026-42795 (1)

Vendor Advisories for CVE-2026-42795 (3)

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

CVE-2026-43965 Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion
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-59

V. Comments for CVE-2026-42795

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