CVE-2026-13122: openvpn Reachable Assertion
CVSS: 5.9v4.0MediumAnalyzed
AliasesALPINE-CVE-2026-13122UBUNTU-CVE-2026-13122DEBIAN-CVE-2026-13122
Published 06-07-2026Last modified 06-07-2026
Vulnerability summary
CVE-2026-13122 is a medium (CVSS 5.9) Reachable Assertion vulnerability in openvpn. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.3% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v4.0 (CVE.org)EPSS score
0.46%
0%100%
Low · +0.16 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 06-07-2026PublishedVulnerability first disclosed.
- 06-07-2026Last modifiedVulnerability information updated.
Description
OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to cause a denial of service via a malformed authentication token that triggers a reachable assertion when external-auth is enabled
CVSS metrics
7 scores · 5 sources · 2 versionsMedium 5.9Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- NVDNIST5.9MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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
Medium 5.3Preferred score · OSV · Alpine (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
+0.16 pp
From 0.29% on 20-09-2026
20-09-202620-10-2026
EPSS score0.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- openvpn≥ 2.6.0, < 2.7.5-r0
Debian1 product
- openvpn< 2.6.14-0+deb12u2 | < 2.6.14-1+deb13u3 | < 2.7.5-1
Openvpn1 product
- openvpn≥ 2.6.0, ≤ 2.6.20 | ≥ 2.7_alpha1, ≤ 2.7.4 | ≥ 2.6.0, < 2.6.21 | ≥ 2.7, < 2.7.5
Ubuntu1 product
- openvpn< 2.6.19-0ubuntu0.24.04.3 | All versions (No fix recorded) | < 2.7.0-1ubuntu1.2
4 vendors · 4 products
