rustsec-2026-0276
Vulnerability from osv_rustsec
The file-serving fallback joined a request-derived path onto the
configured response directory and checked only that the result existed,
never that it stayed inside that directory. A request containing a raw
.. segment could read any file readable by the process, returned with
HTTP 200.
Read-only: no write, no code execution.
On the 4.x line apimock is a single crate containing the serving code.
Fixed in 4.8.1 by canonicalising each resolved path and rejecting
anything outside its base directory.
apimock 5.0.0 and later are not affected by this advisory. From
5.0.0 the serving code moved to the apimock-server crate, which
apimock depends on; that crate carries its own advisory for the same
issue, fixed in 5.19.1.
{
"affected": [
{
"database_specific": {
"categories": [
"file-disclosure"
],
"cvss": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"informational": null
},
"ecosystem_specific": {
"affected_functions": null,
"affects": {
"arch": [],
"functions": [],
"os": []
}
},
"package": {
"ecosystem": "crates.io",
"name": "apimock",
"purl": "pkg:cargo/apimock"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.0-0"
},
{
"fixed": "4.8.1"
},
{
"introduced": "5.0.0"
},
{
"fixed": "5.0.0"
}
],
"type": "SEMVER"
}
],
"versions": []
}
],
"aliases": [
"GHSA-72g6-wgrg-vhm7"
],
"database_specific": {
"license": "CC0-1.0"
},
"details": "The file-serving fallback joined a request-derived path onto the\nconfigured response directory and checked only that the result existed,\nnever that it stayed inside that directory. A request containing a raw\n`..` segment could read any file readable by the process, returned with\nHTTP 200.\n\nRead-only: no write, no code execution.\n\nOn the 4.x line `apimock` is a single crate containing the serving code.\nFixed in 4.8.1 by canonicalising each resolved path and rejecting\nanything outside its base directory.\n\n**apimock 5.0.0 and later are not affected by this advisory.** From\n5.0.0 the serving code moved to the `apimock-server` crate, which\n`apimock` depends on; that crate carries its own advisory for the same\nissue, fixed in 5.19.1.",
"id": "RUSTSEC-2026-0276",
"modified": "2026-09-02T08:56:54Z",
"published": "2026-08-26T12:00:00Z",
"references": [
{
"type": "PACKAGE",
"url": "https://crates.io/crates/apimock"
},
{
"type": "ADVISORY",
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0276.html"
},
{
"type": "WEB",
"url": "https://github.com/apimokka/apimock-rs/commit/a9c05fec2d36a750c30e797291a0557f230c8faf"
}
],
"related": [],
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Path traversal in apimock\u0027s file-serving fallback"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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