The shlex crate before 1.2.1 for Rust allows unquoted and unescaped instances of the { and \xa0 characters, which may facilitate command injection.

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

The shlex crate before 1.2.1 for Rust allows unquoted and unescaped instances of the { and \xa0 characters, which may facilitate command injection.

Source published

27 Jul 2025 00:00:00 UTC

Source modified

28 Jul 2025 15:03:56 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 3.2 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

The shlex crate before 1.2.1 for Rust allows unquoted and unescaped instances of the { and \xa0 characters, which may facilitate command injection.

Source published

Jul 27, 2025, 12:00:00 AM (timezone not stated)

Source modified

Jul 28, 2025, 3:03:56 PM (timezone not stated)

Observed here

9 Nov 2026 01:12:34 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 3.2 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

The shlex crate before 1.2.1 for Rust allows unquoted and unescaped instances of the { and \xa0 characters, which may facilitate command injection.

Source published

27 Jul 2025 22:15:25 UTC

Source modified

17 Jun 2026 08:14:44 UTC

Observed here

25 Oct 2026 01:17:17 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 3.2 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

CVSS 3.1 · [email protected] · Primary · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## Issue 1: Failure to quote characters Affected versions of this crate allowed the bytes `{` and `\xa0` to appear unquoted and unescaped in command arguments. If the output of `quote` or `join` is passed to a shell, then what should be a single command argument could be interpreted as multiple arguments. This does not *directly* allow arbitrary command execution (you can't inject a command substitution or similar). But depending on the command you're running, being able to inject multiple arguments where only one is expected could lead to undesired consequences, potentially including arbitrary command execution. The flaw was corrected in version 1.2.1 by escaping additional characters. Updating to 1.3.0 is recommended, but 1.2.1 offers a more minimal fix if desired. Workaround: Check for the bytes `{` and `\xa0` in `quote`/`join` input or output. (Note: `{` is problematic because it is used for glob expansion. `\xa0` is problematic because it's treated as a word separator in [specific environments][solved-xa0].) ## Issue 2: Dangerous API w.r.t. nul bytes Version 1.3.0 deprecates the `quote` and `join` APIs in favor of `try_quote` and `try_join`, which behave the same except that they have `Result` return type, returning `Err` if the input contains nul bytes. Strings containing nul bytes generally cannot be used in Unix command arguments or environment variables, and most shells cannot handle nul bytes even internally. If you try to pass one anyway, then the results might be security-sensitive in uncommon scenarios. [More details here.][nul-bytes] Due to the low severity, the behavior of the original `quote` and `join` APIs has not changed; they continue to allow nuls. Workaround: Manually check for nul bytes in `quote`/`join` input or output. ## Issue 3: Lack of documentation for interactive shell risks The `quote` family of functions does not and cannot escape control characters. With non-interactive shells this is perfectly safe, as control characters have no special effect. But if you writing directly to the standard input of an interactive shell (or through a pty), then control characters [can cause misbehavior including arbitrary command injection.][control-characters] This is essentially unfixable, and has not been patched. But as of version 1.3.0, documentation has been added. Future versions of `shlex` may add API variants that avoid the issue at the cost of reduced portability. [solved-xa0]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#solved-xa0 [nul-bytes]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#nul-bytes [control-characters]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#control-characters-interactive-contexts-only

Source published

22 Jan 2024 21:21:30 UTC

Source modified

28 Jul 2025 16:42:04 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Publisher rating · LOW

## Issue 1: Failure to quote characters Affected versions of this crate allowed the bytes `{` and `\xa0` to appear unquoted and unescaped in command arguments. If the output of `quote` or `join` is passed to a shell, then what should be a single command argument could be interpreted as multiple arguments. This does not *directly* allow arbitrary command execution (you can't inject a command substitution or similar). But depending on the command you're running, being able to inject multiple arguments where only one is expected could lead to undesired consequences, potentially including arbitrary command execution. The flaw was corrected in version 1.2.1 by escaping additional characters. Updating to 1.3.0 is recommended, but 1.2.1 offers a more minimal fix if desired. Workaround: Check for the bytes `{` and `\xa0` in `quote`/`join` input or output. (Note: `{` is problematic because it is used for glob expansion. `\xa0` is problematic because it's treated as a word separator in [specific environments][solved-xa0].) ## Issue 2: Dangerous API w.r.t. nul bytes Version 1.3.0 deprecates the `quote` and `join` APIs in favor of `try_quote` and `try_join`, which behave the same except that they have `Result` return type, returning `Err` if the input contains nul bytes. Strings containing nul bytes generally cannot be used in Unix command arguments or environment variables, and most shells cannot handle nul bytes even internally. If you try to pass one anyway, then the results might be security-sensitive in uncommon scenarios. [More details here.][nul-bytes] Due to the low severity, the behavior of the original `quote` and `join` APIs has not changed; they continue to allow nuls. Workaround: Manually check for nul bytes in `quote`/`join` input or output. ## Issue 3: Lack of documentation for interactive shell risks The `quote` family of functions does not and cannot escape control characters. With non-interactive shells this is perfectly safe, as control characters have no special effect. But if you writing directly to the standard input of an interactive shell (or through a pty), then control characters [can cause misbehavior including arbitrary command injection.][control-characters] This is essentially unfixable, and has not been patched. But as of version 1.3.0, documentation has been added. Future versions of `shlex` may add API variants that avoid the issue at the cost of reduced portability. [solved-xa0]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#solved-xa0 [nul-bytes]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#nul-bytes [control-characters]: https://docs.rs/shlex/latest/shlex/quoting_warning/index.html#control-characters-interactive-contexts-only

Source published

21 Jan 2024 12:00:00 UTC

Source modified

12 Oct 2026 18:00:05 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.