Medium [CVE-2026-12996] Denial of Service or memory leak via crafted packets
This medium-severity Red Hat Linux advisory covers CVE-2026-12996.
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Summary
A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry A flaw was found in OpenVPN.
Successful exploitation of this flaw could lead to a denial of service, making the service unavailable, or result in a memory leak, potentially exposing sensitive information. Moderate impact.
While it can lead to a denial of service or memory leak, the need for prior authentication limits the attack vector, making it less severe than unauthenticated vulnerabilities. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H).
Weakness: CWE-825.
- 2.6.0
- 2.6.20
- 2.7.4
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
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