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Fencer Vulns
medium 6.5

CVE-2026-35058 json

Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows…

published 2026-06-08 5 mo ago modified 2026-08-11 2 mo ago also EUVD-2026-35197

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows authenticated attackers to trigger a fatal assertion and cause a denial of service via a specially crafted packet.

Patch / fix

  • openvpn openvpn 2.6.20, 2.7.2
  • openvpn Debian 12 2.6.14-0+deb12u1
  • openvpn Debian 13 2.6.14-1+deb13u2
  • openvpn Debian 14 2.7.2-1

debian advisories DEBIAN-CVE-2026-35058

  • openvpn Ubuntu 22.04 LTS 2.5.11-0ubuntu0.22.04.3
  • openvpn Ubuntu 24.04 LTS 2.6.19-0ubuntu0.24.04.2
  • openvpn Ubuntu 25.10 2.6.19-0ubuntu0.25.10.2
  • openvpn Ubuntu 26.04 LTS 2.7.0-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-35058

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvpn SLES for SAP applications 16.0, SLES 16.0 2.6.10-160000.5.1
  • openvpn SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.6.10-150600.3.26.1
  • openvpn-dco SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.6.10-150600.3.26.1

suse advisories SUSE-SU-2026:24220-1SUSE-SU-2026:3596-1

  • openvpn openSUSE Leap 16.0 2.6.10-160000.5.1

opensuse advisories openSUSE-SU-2026:22072-1

  • openvpn Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.6.20-r0

alpine advisories ALPINE-CVE-2026-35058

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-35058 updated cvss 6.5

OpenVPN: OpenVPN: Denial of Service via improper packet length validation

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2381 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenVPN OpenVPN

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.