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RUSTSEC-2026-0482
cap-primitivescap-primitivescap-primitives resolves a path inside a sandboxed directory one component at a time and opens the last component with O_NOFOLLOW, so that a symlink there cannot lead out of the directory. When the path ended in /, the resolver added the slash back to the last component before opening it. With a trailing slash the operating system no longer treats that component as the last one, so O_NOFOLLOW does not apply, the symlink is followed, and the resulting file descriptor was returned without further checks.
A symlink inside the sandbox that points outside it, such as escape -> ../outside or a link to /, can therefore be opened as escape/. If the symlink's own target ends in /, the caller's path does not need a trailing slash at all, so removing trailing slashes from untrusted input is not a workaround. The maintainers' advisory reports reads and writes outside the sandbox through open, open_dir, read_dir and canonicalize, and directory creation, removal and renames outside it through create_dir, remove_dir and rename.
This resolver is used on Windows and macOS, on FreeBSD when O_RESOLVE_BENEATH is not available, and on Linux when openat2 is not available (kernels before 5.6, or a seccomp policy that rejects it). cap-std and other crates built on cap-primitives are affected through it. Wasmtime's WASI filesystem support was affected as well; that is covered by RUSTSEC-2026-0269.
The fix stops re-adding the trailing slash and is in 3.4.6 and 4.0.3.
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The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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