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tmpdir: fix insecure temporary directory vulnerability (CVE-2025-71176) (cherry picked from commit 95d8423)
bluetech
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Apr 7, 2026
bluetech
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patchback/backports/9.0.x/95d8423bd24992deea5b9df32555fa1741679e2c/pr-14343
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This is a backport of PR #14343 as merged into main (95d8423).
This is my proposed alternative to #13669 as discussed in the issue. I think we should go with the simple fix for now. I think this one should be safe to backport.
A previous fix for insecure temporary directory issue c49100c wasn't sufficient because it followed symlinks.
Stop following symlinks, and reject if a symlink; we know it shouldn't be.
Fix #14279.
[0] https://www.openwall.com/lists/oss-security/2026/01/21/5