CVE-2026-12996
published 2026-10-14CVE-2026-12996: The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 allows remote authenticated peers to…
PriorityP342high8.1CVSS 3.1
AVNACLPRLUINSUCHINAH
EPSS
0.46%
40.0th percentile
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| openvpn | openvpn | >= 2.6.0 < 2.6.21 | 2.6.21 |
| openvpn | openvpn | 2.6.0 – 2.6.22 | — |
| openvpn | openvpn | >= 2.7 < 2.7.5 | 2.7.5 |
| openvpn | openvpn | 2.7_alpha1 – 2.7.7 | — |
| ubuntu | openvpn | — | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvdv4.06.0MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.1HIGH
vendor_ubuntu5.3MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
vendor_redhat·2026-10-14·CVSS 8.1
CVE-2026-84471 [HIGH] CWE-825 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 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 due to an incomplete fix for a previously identified use-after-free memory vulnerability. A remote authenticated peer can exploit this issue by sending specially crafted network packets during Transport Layer Security (TLS) session promotion or expiration. Successful exploitation primarily leads to a Denial of Service (DoS) by crashing the service, and may additionally result in information disclosure through lea
Red Hat
OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
vendor_redhat·2026-07-30·CVSS 6.0
CVE-2026-12996 [MEDIUM] CWE-825 OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
A flaw was found in OpenVPN. This use-after-free vulnerability allows remote authenticated peers to send specially crafted packets during TLS (Transport Layer Security) session promotion or expiry. 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.
Statement: Moderate impact. This use-after-free flaw in OpenVPN requires a remote authenticated peer to send specially crafted packets during TLS session handling. 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.
Ubuntu
OpenVPN vulnerabilities
vendor_ubuntu·2026-07-14·CVSS 5.3
CVE-2026-13117 [MEDIUM] OpenVPN vulnerabilities
Title: OpenVPN vulnerabilities
Summary: Several security issues were fixed in OpenVPN.
It was discovered that OpenVPN had a 1-byte buffer overrun when handling
NTLMv2 proxy responses. An attacker could use this issue to cause a denial
of service or possibly execute arbitrary code. This issue only affected
Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-11771)
It was discovered that OpenVPN incorrectly handled metadata when extracting
tls-crypt-v2 client keys. An attacker could possibly use this issue to
obtain sensitive information. (CVE-2026-12932)
It was discovered that OpenVPN had a use-after-free in the ack_write_buf
handling. An attacker could use this issue to cause OpenVPN to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2026-12996)
It was d
GHSA
The fix for CVE-2026-12996 was incomplete.
ghsa_unreviewed·2026-10-14·CVSS 8.1
CVE-2026-84471 [HIGH] CWE-416 The fix for CVE-2026-12996 was incomplete.
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry.
GHSA
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 s
ghsa_unreviewed·2026-07-30
CVE-2026-12996 [MEDIUM] CWE-125 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 s
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
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling [epel-10]
bugzilla·2026-10-15·CVSS 8.1
CVE-2026-84471 [HIGH] CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling [epel-10]
CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling [epel-10]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry.
Bugzilla
CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
bugzilla·2026-10-14·CVSS 8.1
CVE-2026-84471 [HIGH] CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
CVE-2026-84471 openvpn: OpenVPN: Denial of Service via use-after-free during TLS session handling
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry.
Bugzilla
CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [epel-all]
bugzilla·2026-07-31·CVSS 6.0
CVE-2026-12996 [MEDIUM] CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [epel-all]
CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [fedora-all]
bugzilla·2026-07-31·CVSS 6.0
CVE-2026-12996 [MEDIUM] CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [fedora-all]
CVE-2026-12996 openvpn: OpenVPN: Denial of Service or memory leak via crafted packets [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-12996 OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
bugzilla·2026-07-30·CVSS 6.0
CVE-2026-12996 [MEDIUM] CVE-2026-12996 OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
CVE-2026-12996 OpenVPN: OpenVPN: Denial of Service or memory leak via crafted packets
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
2026-10-14
Published