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CVE-2026-39860

Nix is a package manager for Linux and other Unix systems. A bug in the fix for CVE-2024-27297 allowed for arbitrary overwrites of files writable by the Nix process orchestrating the builds (typically the Nix daemon running as root in multi-user installations) by following symlinks during fixed-output derivation output registration. This affects sandboxed Linux builds - sandboxed macOS builds are unaffected. The location of the temporary output used for the output copy was located inside the bui
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:28ff2754492c2b06d76e75bfdf26b5799a86e28bd9332d7108a2066aa1dcd95b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"nix","vendor":"NixOS","versions":[{"status":"affected","version":">= 2.21, < 2.28.6"},{"status":"affected","version":">= 2.29.0, < 2.29.3"},{"status":"affected","version":">= 2.30.0, < 2.30.4"},{"status":"affected","version":">= 2.31.0, < 2.31.4"},{"status":"affected","version":">= 2.32.0, < 2.32.7"},{"status":"affected","version":">= 2.33.0, < 2.33.4"},{"status":"affected","version":">= 2.34.0, < 2.34.5"},{"status":"affected","version":">= 2.20.5, <= 2.20.9"},{"status":"affected","version":">= 2.19.4, <= 2.19.7"},{"status":"affected","version":">= 2.18.2, <= 2.18.9"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-61","description":"CWE-61: UNIX Symbolic Link (Symlink) Following","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/NixOS/nix/commit/244f3eee0bbc7f11e9b383a15ed7368e2c4becc9","tags":["x_refsource_MISC"],"url":"https://github.com/NixOS/nix/commit/244f3eee0bbc7f11e9b383a15ed7368e2c4becc9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/2
{"name":"https://github.com/NixOS/nix/commit/4bc5a3510fa3735798f9ed3a2a30a3ea7b32343a","tags":["x_refsource_MISC"],"url":"https://github.com/NixOS/nix/commit/4bc5a3510fa3735798f9ed3a2a30a3ea7b32343a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/3
{"name":"https://github.com/NixOS/nix/commit/7794354a982449927ee7401cdeb573ddd16c4688","tags":["x_refsource_MISC"],"url":"https://github.com/NixOS/nix/commit/7794354a982449927ee7401cdeb573ddd16c4688"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/4
{"name":"https://github.com/NixOS/nix/commit/a3163b9eabb952b4aa96e376dea95ebcca97b31a","tags":["x_refsource_MISC"],"url":"https://github.com/NixOS/nix/commit/a3163b9eabb952b4aa96e376dea95ebcca97b31a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/5
{"name":"https://github.com/NixOS/nix/pull/10178","tags":["x_refsource_MISC"],"url":"https://github.com/NixOS/nix/pull/10178"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/1
{"name":"https://github.com/NixOS/nix/security/advisories/GHSA-g3g9-5vj6-r3gj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/NixOS/nix/security/advisories/GHSA-g3g9-5vj6-r3gj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f1ee8ec92182b6ee64cbfb0f6e946544bea4e9a38e632dc238c21b750915df1 · sha256:aac6e3ad237cc649… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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