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

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 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

Timeline

  1. ID reserved

    By EEF

  2. · 29 days later

    Published

  3. · 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

CVSS scores of CVE-2026-43965, by who scored it
Scored byCVSSScoreVector
EEFCNA (assigner)4.0Medium5.6CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
NVDNVD · Deferred4.0Medium5.6CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/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
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.6.

Affected products

  • Gleam · Gleam

    • affected 0.18.0-rc1 – < 1.17.0

  • Gleam · Gleam

    • 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 v0.18.0-rc1-erlang-slim – < v1.17.0-erlang-slim
    • affected v0.18.0-rc1-erlang-alpine – < v1.17.0-erlang-alpine
    • affected v0.18.0-rc1-elixir-alpine – < v1.17.0-elixir-alpine
    • affected v0.18.0-rc1-node-alpine – < v1.17.0-node-alpine
    • affected v0.18.0-rc1-scratch – < v1.17.0-scratch

  • Gleam · Gleam

    • affected ed7aec0484f10d60978b63788c8a6497590855ab – < 690ca069817bee5f77a28fc3e360627c1da19291

References

References5

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .