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Vulnerabilities

Vulnerability · CVE-2026-88964

An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disc…

Published Oct 13, 2026 · catalog updated Oct 14, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-88964. EPSS is 0.47%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
Debian:12 openvpn · Debian:13 openvpn · Debian:14 openvpn

An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 openvpn2.6.11-1, 2.6.12-1, 2.6.13-1
  • Debian:13 openvpn2.6.14-1, 2.6.14-1+deb13u1, 2.6.14-1+deb13u2
  • Debian:14 openvpn0 → 2.7.8-1

How to fix CVE-2026-88964

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-88964. EPSS is 0.47%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with 2.6.11-1, 2.6.12-1, 2.6.13-1, 2.6.14-1, 2.6.14-1+deb13u1, 2.6.14-1+deb13u2, 0 → 2.7.8-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read; CWE-191: Integer Underflow. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · Catalog

    Detected

    An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

  2. Oct 14, 2026 · Catalog

    Fix available

    Debian:14 openvpn 0 → 2.7.8-1

  3. Oct 14, 2026 · Catalog

    Updated

    An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

  4. Oct 14, 2026 · NIST NVD

    Updated

    An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

Sources

  • CVE.orgVulnerability recordCVE-2026-88964

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-88964

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-88964

    An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-88964
    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.