CVE-2026-78129: strongswan Infinite Loop
CVSS: 5.9v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-78129DEBIAN-CVE-2026-78129CGA-mm9m-cr4p-jcmh
Published 11-09-2026Last modified 11-09-2026
Vulnerability summary
CVE-2026-78129 is a medium (CVSS 5.9) Infinite Loop vulnerability in strongswan. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 8 · Related 7Timeline
- 11-09-2026PublishedVulnerability first disclosed.
- 11-09-2026Last modifiedVulnerability information updated.
Description
strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.9Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.41%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
0.00 pp
From 0.41% on 20-09-2026
20-09-202620-10-2026
EPSS score0.41%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard1 product
- py3.13-vici< 6.1.0-r1
Debian1 product
- strongswanAll versions (No fix recorded) | < 6.0.1-6+deb13u7 | < 6.1.0-1
Strongswan1 product
- strongswan≥ 4.6.2, < 6.1.0
Ubuntu1 product
- strongswanAll versions (No fix recorded) | < 5.9.5-2ubuntu2.8 | < 5.9.13-2ubuntu4.24.04.5 | < 6.0.4-1ubuntu3.2
Wolfi1 product
- py3.13-vici< 6.1.0-r1
5 vendors · 5 products
References
7 links- www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78129).htmlREPORTMitigationVendor Advisory
