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 9 days 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 9 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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