PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
AI Analysis
Technical Summary
CVE-2026-34181 describes a vulnerability in Microsoft software version 3.0 where PKCS#12 files using PBMAC1 are accepted even when the HMAC keys are shorter than recommended. This could lead to weakened integrity validation due to insufficient key length in the HMAC process. The vulnerability is categorized under CWE-354, indicating improper validation of integrity check values. No further technical details or exploitation information is available.
Potential Impact
The vulnerability may reduce the effectiveness of integrity checks on PKCS#12 files, potentially allowing malformed or tampered files to be accepted. However, no known exploits are reported, and no specific impact scenarios are detailed in the available information.
Mitigation Recommendations
No patch or remediation information is provided. Patch status is not yet confirmed — check the Microsoft Security Response Center advisory for current remediation guidance. Until official fixes are available, cautious handling of PKCS#12 files and validation of cryptographic parameters is advised.
PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys
Description
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Affected software
pkg:github/microsoft/microsoftRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34181 describes a vulnerability in Microsoft software version 3.0 where PKCS#12 files using PBMAC1 are accepted even when the HMAC keys are shorter than recommended. This could lead to weakened integrity validation due to insufficient key length in the HMAC process. The vulnerability is categorized under CWE-354, indicating improper validation of integrity check values. No further technical details or exploitation information is available.
Potential Impact
The vulnerability may reduce the effectiveness of integrity checks on PKCS#12 files, potentially allowing malformed or tampered files to be accepted. However, no known exploits are reported, and no specific impact scenarios are detailed in the available information.
Mitigation Recommendations
No patch or remediation information is provided. Patch status is not yet confirmed — check the Microsoft Security Response Center advisory for current remediation guidance. Until official fixes are available, cautious handling of PKCS#12 files and validation of cryptographic parameters is advised.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-34181
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a2d2f8be617e2d834b6ea66
Added to database: 06/13/2026, 10:23:07 UTC
Last enriched: 06/13/2026, 10:24:45 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 80
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