Security Bulletin
Summary
Vault's audit devices did not validate the contents of a configured audit log prefix and did not consistently enforce the server-level setting that restricts audit log prefixing. This may allow a privileged operator to inject content into audit logs, potentially leading to forged or misleading audit records. This vulnerability (CVE-2026-93333) is fixed in Vault Community Edition 2.2.2 and Vault Enterprise 2.2.2, 1.21.14, and 1.19.25.
Vulnerability Details
CVEID: CVE-2026-93333
DESCRIPTION: Vault did not reject control characters or line separator characters in an audit log prefix. Because the prefix is written ahead of every audit entry, a crafted prefix could cause log consumers to interpret a single audit entry as multiple records, potentially allowing fabricated entries to appear alongside legitimate ones. In addition, the allow_audit_log_prefixing parameter was only enforced for file audit devices, so socket and syslog audit devices could be configured with a prefix even when the parameter was disabled. This issue requires an authenticated operator with privileges to enable audit devices. File audit devices are only affected when allow_audit_log_prefixing is enabled.
CWE: CWE-117: Improper Output Neutralization for Logs
CVSS Source: HashiCorp Inc.
CVSS Base score: 2.7
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Vault Community Edition | affected from 0.7.0 up to 2.2.2 |
| Vault Enterprise | affected from 0.7.0 up to 2.2.2, unaffected from 1.19.25, 1.21.14 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to Vault Community Edition 2.2.2 or Vault Enterprise 2.2.2, 1.21.14, or 1.19.25. After upgrading, existing audit devices configured with a prefix will continue to operate without the prefix if allow_audit_log_prefixing is disabled or if the prefix contains disallowed characters.
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References
Acknowledgement
This issue was reported to HashiCorp by Tal Vaknin, Independent Security Researcher.
Change History
12 Nov 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
12 November 2026
Initial Publish date:
12 November 2026
UID
ibm17296636