CVE-2026-12932Network attack vector

Server crash via unreleased client-key allocations

Published Jul 30, 2026 · Updated Jul 30, 2026

Memory leakage in OpenVPN 2.5.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to crash servers. The tls_crypt_v2_extract_client_key function fails to release allocations created while extracting a client key, so crafted packets accumulate memory. The server must enable tls-crypt-v2, and the attacker must possess a valid client key; sustained packet delivery exhausts memory and terminates the daemon.

CVSS severity7.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in OpenVPN 2.5.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to crash servers. The tls_crypt_v2_extract_client_key function fails to release allocations created while extracting a client key, so crafted packets accumulate memory. The server must enable tls-crypt-v2, and the attacker must possess a valid client key; sustained packet delivery exhausts memory and terminates the daemon.

The record

CVE
CVE-2026-12932
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
OpenVPN Inc.
Product
OpenVPN
Classifications
CWE-401, 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=2.5.0 <=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=2.5.0 <=2.6.20; version=2.7_alpha1 <=2.7.4

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1OpenVPN Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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