CVE-2026-13117Network attack vector

Server crash or heap disclosure via stale alias

Published Jul 30, 2026 · Updated Jul 30, 2026

Use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated users to crash servers or read heap data. The check_session_buf_not_used() guard fails to recognize aliases in tls_wrap_reneg.work.data, so TLS session promotion frees memory that remains referenced. Exploitation requires an authenticated peer and dynamic tls-crypt-v2; it can terminate the server or disclose sensitive heap contents to that peer.

CVSS severity6.0
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated users to crash servers or read heap data. The check_session_buf_not_used() guard fails to recognize aliases in tls_wrap_reneg.work.data, so TLS session promotion frees memory that remains referenced. Exploitation requires an authenticated peer and dynamic tls-crypt-v2; it can terminate the server or disclose sensitive heap contents to that peer.

The record

CVE
CVE-2026-13117
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
OpenVPN Inc.
Product
OpenVPN
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.0 <=2.6.20
  2. Affected versionversion=2.7_alpha1 <=2.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenVPN Inc. · OpenVPNversion=2.6.0 <=2.6.20; version=2.7_alpha1 <=2.7.4

Published CVSS scores

6.0OpenVPN Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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