High severity · published Aug 12, 2026
CVE-2026-73286
RustF: Request headers can populate server-derived IAM condition keys, letting a caller satisfy identity-based policy conditions
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.12, RustFS get_condition_values folds attacker-controlled request headers from HeaderMap into server-derived userid, username, principaltype, groups, versionid, signatureversion, jwt:, and ldap: condition keys, allowing authenticated callers to satisfy identity-based policy conditions. This issue is fixed in version 1.0.0-beta.12.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RU
rustfs · rustfs
< 1.0.0-beta.12 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73286
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73286
github.com
https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L45
github.com
https://github.com/rustfs/rustfs/commit/92f83bfe155d8a3b9cdd903086e5b28d52339efb
github.com
https://github.com/rustfs/rustfs/releases/tag/1.0.0-beta.12
github.com
https://github.com/rustfs/rustfs/security/advisories/GHSA-6r96-hmgc-726c
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