Vulnerability details
CVE-2026-49991
rustfs rustfs
RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection
CVSS 3.1
8.6High
Official description
RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| rustfs | rustfs | 1.0.0-beta.4 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3 x_refsource_CONFIRM
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Details
- Published
- 2026-06-26
- Last updated
- 2026-06-29
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.41%
Probability of exploitation in 30 days
36%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-862Missing Authorization