RUSTSEC-2026-0009 (CVE-2026-25727)
Vulnerability from osv_rustsec – Published: 2026-02-05 12:00 – Updated: 2026-02-06 09:12 – Source websiteImpact
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.
{
"affected": [
{
"database_specific": {
"categories": [
"denial-of-service"
],
"cvss": "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",
"informational": null
},
"ecosystem_specific": {
"affected_functions": null,
"affects": {
"arch": [],
"functions": [
"time::Date::parse",
"time::OffsetDateTime::parse",
"time::PrimitiveDateTime::parse",
"time::Time::parse",
"time::UtcDateTime::parse",
"time::UtcOffset::parse",
"time::parsing::Parsed::parse_item"
],
"os": []
}
},
"package": {
"ecosystem": "crates.io",
"name": "time",
"purl": "pkg:cargo/time"
},
"ranges": [
{
"events": [
{
"introduced": "0.3.6"
},
{
"fixed": "0.3.47"
}
],
"type": "SEMVER"
}
],
"versions": []
}
],
"aliases": [
"CVE-2026-25727",
"GHSA-r6v5-fh4h-64xc"
],
"database_specific": {
"license": "CC0-1.0"
},
"details": "## Impact\n\nWhen user-provided input is provided to any type that parses with the RFC 2822 format, a denial of\nservice attack via stack exhaustion is possible. The attack relies on formally deprecated and\nrarely-used features that are part of the RFC 2822 format used in a malicious manner. Ordinary,\nnon-malicious input will never encounter this scenario.\n\n## Patches\n\nA limit to the depth of recursion was added in v0.3.47. From this version, an error will be returned\nrather than exhausting the stack.\n\n## Workarounds\n\nLimiting the length of user input is the simplest way to avoid stack exhaustion, as the amount of\nthe stack consumed would be at most a factor of the length of the input.",
"id": "RUSTSEC-2026-0009",
"modified": "2026-02-06T09:12:16Z",
"published": "2026-02-05T12:00:00Z",
"references": [
{
"type": "PACKAGE",
"url": "https://crates.io/crates/time"
},
{
"type": "ADVISORY",
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0009.html"
},
{
"type": "WEB",
"url": "https://github.com/time-rs/time/blob/main/CHANGELOG.md#0347-2026-02-05"
}
],
"related": [],
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Denial of Service via Stack Exhaustion"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
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