CVE-2026-42795

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-43965 Path traversal vulnerability in Gleam's dependency management allows arbitrary directory… Also affects gleam
• CVE-2026-32685 Path traversal vulnerability in Gleam's handling of custom documentation pages allows… Also affects gleam
• CVE-2026-113724 virtualenv is a tool for creating isolated virtual python environments. CWE-59
• CVE-2026-113716 virtualenv is a tool for creating isolated virtual python environments. CWE-59
• CVE-2026-55480 OpenPrinting CUPS is an open source printing system for Linux and other Unix-like… CWE-59
• CVE-2026-90954 A flaw was found in BusyBox's dpkg-deb archive extraction. CWE-59
• CVE-2026-109274 ImageMagick before 7.1.2-32 contains a time-of-check time-of-use symlink race… CWE-59
• CVE-2026-105081 ImageMagick before 6.9.13-58 and 7.x before 7.1.2-33 does not properly account for… CWE-59