GitHub Advisoryadvisory · crates.io
GHSA-r6v5-fh4h-64xc time vulnerable to stack exhaustion Denial of Service attack
MEDIUM
Official page ↗
- Aliases
- CVE-2026-25727
- Ecosystem
- crates.io
- Packages
- time
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
- Weaknesses
- CWE-121
- Reviewed
- 2026-02-05
Affected packages
• crates.io time: >= 0.3.6, < 0.3.47 → fixed in 0.3.47
Description
Impact
When user-provided input is provided to any type that parses with the RFC 2822 format, a denial of service attack via stack exhaustion is possible. The attack relies on formally deprecated and rarely-used features that are part of the RFC 2822 format used in a malicious manner. Ordinary, non-malicious input will never encounter this scenario.
Patches
A limit to the depth of recursion was added in v0.3.47. From this version, an error will be returned rather than exhausting the stack.
Workarounds
Limiting the length of user input is the simplest way to avoid stack exhaustion, as the amount of the stack consumed would be at most a factor of the length of the input.
Alternatively, avoiding the format altogether would also ensure that the vulnerability is not encountered. To do this, add
```toml
disallowed-types = ["time::format_description::well_known::Rfc2822"]
```
to your `clippy.toml` file. This will trigger the `clippy::disallowed_types` lint, which is warn-by-default and can be explicitly denied.
Related
Alias · CVE (1)
- CVE-2026-25727 time provides date and time handling in Rust. vulnerability
Weakness · CWE (1)
- CWE-121 Stack-based Buffer Overflow weakness
References
- https://github.com/time-rs/time/security/advisories/GHSA-r6v5-fh4h-64xc web
- https://nvd.nist.gov/vuln/detail/CVE-2026-25727 advisory
- https://github.com/time-rs/time/commit/1c63dc7985b8fa26bd8c689423cc56b7a03841ee web
- https://github.com/time-rs/time package
- https://github.com/time-rs/time/blob/main/CHANGELOG.md#0347-2026-02-05 web
- https://github.com/time-rs/time/releases/tag/v0.3.47 web
- https://rustsec.org/advisories/RUSTSEC-2026-0009.html web