CVE-2026-32685Path Traversal in gleam docs build via documentation.pages Allows Arbitrary File Read and Write
- 4.6MediumCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
Path traversal vulnerability in Gleam's handling of custom documentation pages allows arbitrary file read and file write outside the intended documentation output directory. The documentation.pages entries from gleam.toml are incorporated into filesystem paths without sufficient validation or confinement to the intended project and documentation output directories. The documentation.pages[].path field can be used to write generated documentation files outside the intended build/dev/docs/<package>/ output directory. The documentation.pages[].source field can be used to read files outside the project directory and embed their contents into generated documentation output. An attacker who can convince a victim to run gleam docs build on an untrusted project, or with untrusted gleam.toml content, can cause local files readable by the victim to be included in generated documentation artifacts, and can cause generated documentation files to be written outside the intended docs output directory. This issue affects gleam: from 1.16.0 before 1.17.0.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
- Path traversal and arbitrary file read in `gleam docs build` via `documentation.pages` (opens in a new tab)vendor-advisoryrelatedexploit
Timeline
ID reserved
By EEF
- 3 months later
· 3 months later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| EEFCNA (assigner) | 4.0 | Medium4.6 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Deferred | 4.0 | Medium4.6 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.6.
Affected products
- affected 1.16.0 – < 1.17.0
- affected v1.16.0-elixir – < v1.17.0-elixir
- affected v1.16.0-erlang – < v1.17.0-erlang
- affected v1.16.0-node – < v1.17.0-node
- affected v1.16.0-node-slim – < v1.17.0-node-slim
- affected v1.16.0-elixir-slim – < v1.17.0-elixir-slim
- affected v1.16.0-erlang-slim – < v1.17.0-erlang-slim
- affected v1.16.0-erlang-alpine – < v1.17.0-erlang-alpine
- affected v1.16.0-elixir-alpine – < v1.17.0-elixir-alpine
- affected v1.16.0-node-alpine – < v1.17.0-node-alpine
- affected v1.16.0-scratch – < v1.17.0-scratch
- affected 61ed8deb6572b5591ad17d6302c1a38607522f16 – < 81570611906b6b0039c948037094d09a68700f3a
What to do
Workaround: * Avoid running gleam docs build on untrusted projects * Review documentation.pages entries in gleam.toml before generating documentation * Run documentation generation in a restricted or isolated environment (e.g. containers)
References
References6
- Path traversal and arbitrary file read in `gleam docs build` via `documentation.pages` (opens in a new tab)vendor-advisoryrelatedexploit
- EEF CNA record for CVE-2026-32685 (opens in a new tab)related
- OSV record EEF-CVE-2026-32685 (opens in a new tab)related
- Restrict documentation page path handling (opens in a new tab)patch
- Introducing commit 61ed8de in gleam-lang/gleam (opens in a new tab)related
- Fix commit 8157061 in gleam-lang/gleam (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-33927 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-32685)Record last updated .