CVE-2026-35058
Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-35058- CVSS 4.0
- 6.9 Medium
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 - Weakness
- CWE-617
- Updated
- 2026-11-02
EUVDEUVD-2026-35197
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.
- Record
EUVD-2026-35197- CVSS 4.0
- 6.9 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-22j3-3q48-2rmj
Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through...
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.
- Record
GHSA-22j3-3q48-2rmj- CVSS 4.0
- 6.9 Medium
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 - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-617
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-35058- CVSS 4.0
- 6.9 Medium
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 - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-617
- Updated
- 2026-11-02
OSVALPINE-CVE-2026-35058
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.
- Record
ALPINE-CVE-2026-35058- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSV
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.
- Record
CVE-2026-35058- CVSS 4.0
- 6.9 Medium
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 - Weakness
- CWE-617
- Updated
- 2026-11-02
Show 10 moreShow less
OSVDEBIAN-CVE-2026-35058
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.
- Record
DEBIAN-CVE-2026-35058- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-2623
openvpn security update
OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-adapted for the SME and enterprise markets.
Security Fix(es):
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.(CVE-2026-35058)
A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.(CVE-2026-40215)
- Record
OESA-2026-2623- CVSS 4.0
- 6.9 Medium
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 - Updated
- 2026-11-02
OSVOESA-2026-2624
openvpn security update
OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-adapted for the SME and enterprise markets.
Security Fix(es):
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.(CVE-2026-35058)
A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.(CVE-2026-40215)
- Record
OESA-2026-2624- CVSS 4.0
- 6.9 Medium
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 - Updated
- 2026-11-02
OSVOESA-2026-2626
openvpn security update
OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-adapted for the SME and enterprise markets.
Security Fix(es):
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.(CVE-2026-35058)
A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.(CVE-2026-40215)
- Record
OESA-2026-2626- CVSS 4.0
- 6.9 Medium
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 - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-35058
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.
- Record
UBUNTU-CVE-2026-35058- CVSS 4.0
- 6.9 Medium
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 - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVMGASA-2026-0126 No score
Updated openvpn packages fix security vulnerabilities
CVE-2026-35058 - fix server ASSERT() on receiving a suitably malformed packet with a valid tls-crypt-v2 key CVE-2026-40215 - fix race condition in TLS handshake that could lead to leaking of packet data from a previous handshake under specific circumstances
- Record
MGASA-2026-0126- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:22072-1 No score
Security update for openvpn
This update for openvpn fixes the following issues:
- CVE-2026-11771: NTLM proxy auth stack off-by-one write (bsc#1273126).
- CVE-2026-12932: memory leak using --tls-crypt-v2 (bsc#1273127).
- CVE-2026-12996: Potential DoS and memory leak via TLS session use-after-free (bsc#1273128).
- CVE-2026-13117: Heap use-after-free via incomplete guard in check_session_buf_not_used() (bsc#1273129).
- CVE-2026-13379: Windows interactive service DNS SearchList state pollution (bsc#1273130).
- CVE-2026-35058: improper validation of packet length can lead to a denial of service (bsc#1267945).
- CVE-2026-40215: race condition during TLS session promotion can lead to a use-after-free (bsc#1267944).
- CVE-2026-63650: OpenVPN 2.7_alpha1 through 2.7.5 using mbedTLS allows remote authenticated users to be misidentified by ignoring the configured X.509 username identity lookup field (bsc#1275310).
- CVE-2026-84732: Remote Denial of Service via crafted ACK packets (bsc#1279613).
- Record
openSUSE-SU-2026:22072-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:24220-1 No score
Security update for openvpn
This update for openvpn fixes the following issues:
- CVE-2026-11771: NTLM proxy auth stack off-by-one write (bsc#1273126).
- CVE-2026-12932: memory leak using --tls-crypt-v2 (bsc#1273127).
- CVE-2026-12996: Potential DoS and memory leak via TLS session use-after-free (bsc#1273128).
- CVE-2026-13117: Heap use-after-free via incomplete guard in check_session_buf_not_used() (bsc#1273129).
- CVE-2026-13379: Windows interactive service DNS SearchList state pollution (bsc#1273130).
- CVE-2026-35058: improper validation of packet length can lead to a denial of service (bsc#1267945).
- CVE-2026-40215: race condition during TLS session promotion can lead to a use-after-free (bsc#1267944).
- CVE-2026-63650: OpenVPN 2.7_alpha1 through 2.7.5 using mbedTLS allows remote authenticated users to be misidentified by ignoring the configured X.509 username identity lookup field (bsc#1275310).
- CVE-2026-84732: Remote Denial of Service via crafted ACK packets (bsc#1279613).
- Record
SUSE-SU-2026:24220-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:3596-1 No score
Security update for openvpn
This update for openvpn fixes the following issues:
- CVE-2026-11771: NTLM proxy auth stack off-by-one write (bsc#1273126).
- CVE-2026-12932: memory leak using --tls-crypt-v2 (bsc#1273127).
- CVE-2026-12996: Potential DoS and memory leak via TLS session use-after-free (bsc#1273128).
- CVE-2026-13117: Heap use-after-free via incomplete guard in check_session_buf_not_used() (bsc#1273129).
- CVE-2026-13379: Windows interactive service DNS SearchList state pollution (bsc#1273130).
- CVE-2026-35058: improper validation of packet length can lead to a denial of service (bsc#1267945).
- CVE-2026-40215: race condition during TLS session promotion can lead to a use-after-free (bsc#1267944).
- Record
SUSE-SU-2026:3596-1- Updated
- 2026-11-02
OSVUSN-8286-1 No score
openvpn vulnerabilities
Guannan Wang, Zhanpeng Liu, Guancheng Li, and Emma Reuter discovered that OpenVPN incorrectly handled suitably malformed packets with valid tls-crypt-v2 keys. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2026-35058)
Guannan Wang, Zhanpeng Liu, and Guancheng Li discovered that OpenVPN had a race condition in the TLS handshake process that could leak packet data from a previous handshake under certain circumstances. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-40215)
- Record
USN-8286-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openvpnAlpine:v3.20 |
2.6.0 up to 2.6.20-r0 | 2.6.20-r0 |
openvpnAlpine:v3.21 |
2.6.0 up to 2.6.20-r0 | 2.6.20-r0 |
openvpnAlpine:v3.22 |
2.6.0 up to 2.6.20-r0 | 2.6.20-r0 |
openvpnAlpine:v3.23 |
2.6.0 up to 2.6.20-r0 | 2.6.20-r0 |
openvpnAlpine:v3.24 |
2.6.0 up to 2.6.20-r0 | 2.6.20-r0 |
openvpnDebian:12 |
before 2.6.14-0+deb12u1, plus listed versions 2.6.11-12.6.12-12.6.13-12.6.3-12.6.3-1+deb12u1 Show 9 moreShow less2.6.3-1+deb12u1~bpo11+12.6.3-1+deb12u22.6.3-1+deb12u2~bpo11+12.6.3-1+deb12u32.6.3-1+deb12u42.6.3-22.6.3-2.12.6.7-12.6.9-1 |
2.6.14-0+deb12u1 |
openvpnDebian:13 |
before 2.6.14-1+deb13u2, plus listed versions 2.6.14-12.6.14-1+deb13u1 |
2.6.14-1+deb13u2 |
openvpnDebian:14 |
before 2.7.2-1, plus listed versions 2.6.14-12.6.14-22.6.15-12.7.0-12.7.0-1~bpo13+1 Show 16 moreShow less2.7.0~alpha1-12.7.0~alpha2-12.7.0~alpha3-12.7.0~beta1-12.7.0~beta2-12.7.0~beta3-12.7.0~rc1-12.7.0~rc2-12.7.0~rc2-22.7.0~rc3-12.7.0~rc4-12.7.0~rc5-12.7.0~rc6-12.7.1-12.7.1-1~bpo13+12.7.2-1~bpo13+1 |
2.7.2-1 |
openvpnMageia:9 From an advisory covering 2 CVEs |
before 2.6.20-1.1.mga9 | 2.6.20-1.1.mga9 |
openvpnopenEuler:24.03-LTS-SP1 From an advisory covering 2 CVEs |
before 2.6.9-7.oe2403sp1 | 2.6.9-7.oe2403sp1 |
Show 19 moreShow less
| Package | Affected | Fixed |
|---|---|---|
openvpnopenEuler:24.03-LTS-SP3 From an advisory covering 2 CVEs |
before 2.6.9-7.oe2403sp3 | 2.6.9-7.oe2403sp3 |
openvpnopenEuler:22.03-LTS-SP4 From an advisory covering 2 CVEs |
before 2.5.5-7.oe2203sp4 | 2.5.5-7.oe2203sp4 |
openvpnSUSE:Linux Enterprise Server 16.0 From an advisory covering 9 CVEs |
before 2.6.10-160000.5.1 | 2.6.10-160000.5.1 |
openvpnSUSE:Linux Enterprise Server for SAP applications 16.0 From an advisory covering 9 CVEs |
before 2.6.10-160000.5.1 | 2.6.10-160000.5.1 |
openvpnSUSE:Linux Enterprise Module for Basesystem 15 SP7 From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpn-dcoSUSE:Linux Enterprise Module for Basesystem 15 SP7 From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpnSUSE:Linux Enterprise Server 15 SP6-LTSS From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpn-dcoSUSE:Linux Enterprise Server 15 SP6-LTSS From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpnSUSE:Linux Enterprise Server for SAP Applications 15 SP6 From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpn-dcoSUSE:Linux Enterprise Server for SAP Applications 15 SP6 From an advisory covering 7 CVEs |
before 2.6.10-150600.3.26.1 | 2.6.10-150600.3.26.1 |
openvpnUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 2.3.2-4ubuntu12.3.2-5ubuntu12.3.2-7ubuntu12.3.2-7ubuntu22.3.2-7ubuntu3 Show 4 moreShow less2.3.2-7ubuntu3.12.3.2-7ubuntu3.22.3.2-7ubuntu3.2+esm12.3.2-7ubuntu3.2+esm2 |
None known |
openvpnUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.3.7-1ubuntu12.3.7-2ubuntu12.3.8-1ubuntu12.3.10-1ubuntu12.3.10-1ubuntu2 Show 4 moreShow less2.3.10-1ubuntu2.12.3.10-1ubuntu2.22.3.10-1ubuntu2.2+esm12.3.10-1ubuntu2.2+esm2 |
None known |
openvpnUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 2.4.3-4ubuntu12.4.4-1ubuntu12.4.4-2ubuntu12.4.4-2ubuntu1.12.4.4-2ubuntu1.2 Show 5 moreShow less2.4.4-2ubuntu1.32.4.4-2ubuntu1.52.4.4-2ubuntu1.62.4.4-2ubuntu1.72.4.4-2ubuntu1.7+esm1 |
None known |
openvpnUbuntu:20.04:LTS |
All versions, plus listed versions 2.4.7-1ubuntu22.4.7-1ubuntu2.20.04.22.4.7-1ubuntu2.20.04.32.4.7-1ubuntu2.20.04.42.4.12-0ubuntu0.20.04.12.4.12-0ubuntu0.20.04.2 |
None known |
openvpnUbuntu:22.04:LTS |
before 2.5.11-0ubuntu0.22.04.3, plus listed versions 2.5.1-3ubuntu12.5.1-3ubuntu22.5.1-3ubuntu42.5.1-3ubuntu52.5.5-1ubuntu1 Show 5 moreShow less2.5.5-1ubuntu32.5.5-1ubuntu3.12.5.9-0ubuntu0.22.04.22.5.9-0ubuntu0.22.04.32.5.11-0ubuntu0.22.04.1 |
2.5.11-0ubuntu0.22.04.3 |
openvpnUbuntu:24.04:LTS |
before 2.6.19-0ubuntu0.24.04.2, plus listed versions 2.6.5-0ubuntu12.6.7-1ubuntu12.6.9-1ubuntu22.6.9-1ubuntu32.6.9-1ubuntu4 Show 7 moreShow less2.6.9-1ubuntu4.12.6.12-0ubuntu0.24.04.12.6.12-0ubuntu0.24.04.32.6.14-0ubuntu0.24.04.12.6.14-0ubuntu0.24.04.22.6.14-0ubuntu0.24.04.32.6.19-0ubuntu0.24.04.1 |
2.6.19-0ubuntu0.24.04.2 |
openvpnUbuntu:25.10 |
before 2.6.19-0ubuntu0.25.10.2, plus listed versions 2.6.13-1ubuntu32.6.14-1ubuntu12.6.14-2ubuntu12.6.14-2ubuntu1.12.6.19-0ubuntu0.25.10.1 |
2.6.19-0ubuntu0.25.10.2 |
openvpnUbuntu:26.04:LTS |
before 2.7.0-1ubuntu1.1, plus listed versions 2.6.14-2ubuntu12.6.15-1ubuntu12.7.0~rc5-1ubuntu52.7.0~rc6-1ubuntu12.7.0-1ubuntu1 |
2.7.0-1ubuntu1.1 |
openvpnopenSUSE:Leap 16.0 From an advisory covering 9 CVEs |
before 2.6.10-160000.5.1 | 2.6.10-160000.5.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-35058 is a medium vulnerability (CVSS 6.9) in Openvpn, published April 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in openvpn 2.6.20-r0.
References
community.openvpn.net/Security%20Announcements/CVE-2026-35058
talosintelligence.com/vulnerability_reports/TALOS-2026-2381
nvd.nist.gov/vuln/detail/CVE-2026-35058
github.com/advisories/GHSA-22j3-3q48-2rmj
security.alpinelinux.org/vuln/CVE-2026-35058
Show 34 moreShow less
security-tracker.debian.org/tracker/CVE-2026-35058
advisories.mageia.org/MGASA-2026-0126.html
bugs.mageia.org/show_bug.cgi?id=35442
lists.fedoraproject.org/archives/list/[email protected]/message/SFR4RR6F447AZK2ZTKVGZP3NKKWFW6DW
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-2623
suse.com/support/update/announcement/2026/suse-su-202624220-1
bugzilla.suse.com/1267944
ubuntu.com/security/CVE-2026-35058
cve.org/CVERecord?id=CVE-2026-35058