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CVE-2026-13698: A memory leak in OpenVPN version 2.5.0 through 2.5.11, 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allow

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HIGH 7.5REMOTEUPGRADE

CVE-2026-13698 is a high-severity flaw (CVSS 7.5) affecting openvpn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A memory leak in OpenVPN version 2.5.0 through 2.5.11, 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers with a valid tls-crypt-v2 client key to potentially cause a denial of service

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 54%)
CISA exploited listNo
WeaknessCWE-401, CWE-770
Published2026-07-06
Last modified2026-07-09
Publisher (CNA): OpenVPN Inc. · Vendor: openvpn

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Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openvpn openvpn UPGRADE
Affected: >= 2.5.0 and <= 2.5.11 · >= 2.6.0 and < 2.6.21 · >= 2.7 and < 2.7.5
Fixed in: 2.6.21, 2.7.5
Safe to downgrade to: a release before 2.5.0
1. Check installed version
apt-cache policy openvpn || rpm -q openvpn || openvpn --version
2. UPGRADE to 2.6.21 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openvpn
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openvpn
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 2.5.0 (Debian / Ubuntu)
apt-cache madison openvpn sudo apt install openvpn=<VERSION_BEFORE_2.5.0> sudo apt-mark hold openvpn
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openvpn sudo dnf downgrade openvpn-<VERSION_BEFORE_2.5.0> sudo dnf versionlock add openvpn
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-13698?

openvpn: upgrade to 2.6.21, 2.7.5. Exact commands for each OS are on this page.

Is CVE-2026-13698 being exploited?

CVE-2026-13698 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-13698 affect?

CVE-2026-13698 affects openvpn. Severity is high (CVSS 7.5). A memory leak in OpenVPN version 2.5.0 through 2.5.11, 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers with a valid tls-crypt-v2 client key to potentially cause a denial of service

How urgent is CVE-2026-13698?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Software pages

OpenVPN vulnerabilities

Related CVEs

References

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