CVE-2026-3012: Insufficient Verification of Data Authenticity in Red Hat Red Hat Enterprise Linux 10
A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.
AI Analysis
Technical Summary
The vulnerability CVE-2026-3012 affects Samba's group policy certificate enrollment feature. Samba retrieves CA certificates over HTTP without validating their authenticity, leading to insufficient verification of data authenticity (CWE-345). An attacker with network interception capabilities could exploit this to install a malicious CA certificate in the local trust store, compromising trusted communications. Red Hat has issued security advisories RHSA-2026:22644 for RHEL 8 and RHSA-2026:22963 for RHEL 10, providing updated Samba packages that fix this issue.
Potential Impact
Successful exploitation allows an attacker with network interception or redirection capability to supply a malicious CA certificate to a vulnerable Samba client. This could lead to interception or spoofing of communications that rely on the trusted certificate store, impacting confidentiality and integrity of data. The CVSS v3.1 score is 8.0 (High), reflecting the potential for significant impact on confidentiality and integrity without requiring user interaction or privileges.
Mitigation Recommendations
Red Hat has released official security updates for Samba that address this vulnerability. Users should apply the relevant Samba package updates for Red Hat Enterprise Linux 8 and 10 as detailed in advisories RHSA-2026:22644 and RHSA-2026:22963. The vendor advisory provides detailed instructions for applying these updates. No additional mitigation is required once the update is applied.
CVE-2026-3012: Insufficient Verification of Data Authenticity in Red Hat Red Hat Enterprise Linux 10
Description
A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.
CVSS v3.1
Score 8.0high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-3012 affects Samba's group policy certificate enrollment feature. Samba retrieves CA certificates over HTTP without validating their authenticity, leading to insufficient verification of data authenticity (CWE-345). An attacker with network interception capabilities could exploit this to install a malicious CA certificate in the local trust store, compromising trusted communications. Red Hat has issued security advisories RHSA-2026:22644 for RHEL 8 and RHSA-2026:22963 for RHEL 10, providing updated Samba packages that fix this issue.
Potential Impact
Successful exploitation allows an attacker with network interception or redirection capability to supply a malicious CA certificate to a vulnerable Samba client. This could lead to interception or spoofing of communications that rely on the trusted certificate store, impacting confidentiality and integrity of data. The CVSS v3.1 score is 8.0 (High), reflecting the potential for significant impact on confidentiality and integrity without requiring user interaction or privileges.
Mitigation Recommendations
Red Hat has released official security updates for Samba that address this vulnerability. Users should apply the relevant Samba package updates for Red Hat Enterprise Linux 8 and 10 as detailed in advisories RHSA-2026:22644 and RHSA-2026:22963. The vendor advisory provides detailed instructions for applying these updates. No additional mitigation is required once the update is applied.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:22644
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-4408","CVE-2026-4480"]
- State
- PUBLISHED
Threat ID: 6a20982de29bf47b50ebdb59
Added to database: 06/03/2026, 21:10:05 UTC
Last enriched: 07/15/2026, 15:48:19 UTC
Last updated: 09/12/2026, 22:01:33 UTC
Views: 374
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