{"id":"CVE-2026-42795","title":"Symlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball.\n\nThe file collection helpers (gleam_files, native_files, private_files) in compiler-cli/…","summary":"Symlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball.\n\nThe file collection helpers (gleam_files, native_files, private_files) in compiler-cli/…","severity":"medium","cvss":5.1,"cvssVector":"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","cwe":["CWE-59"],"vendor":"Gleam","product":"gleam","affected":["gleam >= 0.10.0-rc1 < 1.17.0","gleam-lang/gleam >= 0.10.0-rc1 < 1.17.0","gleam-lang/gleam >= c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c < 6435a5528b9ae0449e2f32be579641ec485f6866","gleam-lang/gleam >= v0.10.0-rc1-elixir < v1.17.0-elixir","gleam-lang/gleam >= v0.10.0-rc1-erlang < v1.17.0-erlang","gleam-lang/gleam >= v0.10.0-rc1-node < v1.17.0-node","gleam-lang/gleam >= v0.10.0-rc1-node-slim < v1.17.0-node-slim","gleam-lang/gleam >= v0.10.0-rc1-elixir-slim < v1.17.0-elixir-slim","gleam-lang/gleam >= v0.10.0-rc1-erlang-slim < v1.17.0-erlang-slim","gleam-lang/gleam >= v0.10.0-rc1-erlang-alpine < v1.17.0-erlang-alpine","gleam-lang/gleam >= v0.10.0-rc1-elixir-alpine < v1.17.0-elixir-alpine","gleam-lang/gleam >= v0.10.0-rc1-node-alpine < v1.17.0-node-alpine","gleam-lang/gleam >= v0.10.0-rc1-scratch < v1.17.0-scratch"],"published":"2026-06-02","updated":"2026-09-08","sourceUpdated":"2026-09-08T01:17:30.483","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42795","references":[{"url":"https://cna.erlef.org/cves/CVE-2026-42795.html","label":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db"},{"url":"https://github.com/gleam-lang/gleam/commit/6435a5528b9ae0449e2f32be579641ec485f6866","label":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db"},{"url":"https://github.com/gleam-lang/gleam/security/advisories/GHSA-qhh5-fg4c-8gqc","label":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db"},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-42795","label":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db"},{"url":"https://github.com/gleam-lang/gleam/security/advisories/GHSA-qhh5-fg4c-8gqc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-02T15:04:06.195456Z"},"cvssSource":"cna","epss":0.00199,"epssPercentile":0.1002,"ingestedAt":"2026-09-08T13:33:24.799Z","slug":"CVE-2026-42795","body":"## Overview\n\nSymlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball.\n\nThe 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.\n\nAn 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.\n\nThis issue affects Gleam from 0.10.0-rc1 until 1.17.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":28.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":5210,"id":"CVE-2026-42795","ts":1788887253694,"field":"exploit_available","old":"false","new":"true"},{"seq":5209,"id":"CVE-2026-42795","ts":1788887253694,"field":"cvss","old":null,"new":"5.1"},{"seq":5208,"id":"CVE-2026-42795","ts":1788887253694,"field":"severity","old":"none","new":"medium"},{"seq":4093,"id":"CVE-2026-42795","ts":1788886369572,"field":"exploit_available","old":"true","new":"false"},{"seq":4092,"id":"CVE-2026-42795","ts":1788886369572,"field":"cvss","old":"5.1","new":null},{"seq":4091,"id":"CVE-2026-42795","ts":1788886369572,"field":"severity","old":"medium","new":"none"},{"seq":2870,"id":"CVE-2026-42795","ts":1788883035868,"field":"exploit_available","old":"false","new":"true"},{"seq":2869,"id":"CVE-2026-42795","ts":1788883035868,"field":"cvss","old":null,"new":"5.1"},{"seq":2868,"id":"CVE-2026-42795","ts":1788883035868,"field":"severity","old":"none","new":"medium"},{"seq":1899,"id":"CVE-2026-42795","ts":1788882439003,"field":"exploit_available","old":"true","new":"false"},{"seq":1898,"id":"CVE-2026-42795","ts":1788882439003,"field":"cvss","old":"5.1","new":null},{"seq":1897,"id":"CVE-2026-42795","ts":1788882439003,"field":"severity","old":"medium","new":"none"},{"seq":246,"id":"CVE-2026-42795","ts":1788881642774,"field":"exploit_available","old":"false","new":"true"},{"seq":245,"id":"CVE-2026-42795","ts":1788881642774,"field":"cvss","old":null,"new":"5.1"},{"seq":244,"id":"CVE-2026-42795","ts":1788881642774,"field":"severity","old":"none","new":"medium"}]}