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CVE-2026-78133

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision...

7.5 HighFix available

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.47%Unchanged since Sep 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
CVE-2026-78133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
EUVDEUVD-2026-75907 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
EUVD-2026-75907
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-wc93-h4m4-584v 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision...

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
GHSA-wc93-h4m4-584v
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
NVD 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
CVE-2026-78133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
OSV 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
CVE-2026-78133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
OSVDEBIAN-CVE-2026-78133 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
DEBIAN-CVE-2026-78133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2026-78133 7.5

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
UBUNTU-CVE-2026-78133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVAZL-101829 No score

CVE-2026-78133 affecting package strongswan 5.9.14-11

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Record
AZL-101829
Updated
2026-11-02
OSVopenSUSE-SU-2026:11749-1 No score

strongswan-6.1.0-1.1 on GA media

These are all security issues fixed in the strongswan-6.1.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11749-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:22050-1 No score

Security update for strongswan

This update for strongswan fixes the following issues:

  • CVE-2026-78123: Undefined Memory Access When Handling PKCS#7 Containers (bsc#1276533).
  • CVE-2026-78124: Memory Leak When Processing Certificates in PKCS#7 Containers (bsc#1276534).
  • CVE-2026-78126: NULL-Pointer Dereference When Handling AKA-Synchronization-Failure (bsc#1276536).
  • CVE-2026-78127: Memory Leak During Message Stringification (bsc#1276539).
  • CVE-2026-78129: Unbounded Iteration When Decrypting PKCS#7 Containers (bsc#1276540).
  • CVE-2026-78130: NULL-Pointer Dereference in Attribute Certificate Validation (bsc#1276541).
  • CVE-2026-78131: Memory Leaks When Parsing Attribute Certificates (bsc#1276543).
  • CVE-2026-78132: Infinite Loop When Parsing Attribute Certificates (bsc#1276544).
  • CVE-2026-78133: Use-After-Free During Multi-KE Rekey Collision (bsc#1276545).
  • CVE-2026-78134: Missing Inner EAP Method Authentication Details (bsc#1276548).
  • CVE-2026-78135: Creation of a Child SA Pre-Authentication (bsc#1276549).
Record
openSUSE-SU-2026:22050-1
Updated
2026-11-02
OSVSUSE-SU-2026:24199-1 No score

Security update for strongswan

This update for strongswan fixes the following issues:

  • CVE-2026-78123: Undefined Memory Access When Handling PKCS#7 Containers (bsc#1276533).
  • CVE-2026-78124: Memory Leak When Processing Certificates in PKCS#7 Containers (bsc#1276534).
  • CVE-2026-78126: NULL-Pointer Dereference When Handling AKA-Synchronization-Failure (bsc#1276536).
  • CVE-2026-78127: Memory Leak During Message Stringification (bsc#1276539).
  • CVE-2026-78129: Unbounded Iteration When Decrypting PKCS#7 Containers (bsc#1276540).
  • CVE-2026-78130: NULL-Pointer Dereference in Attribute Certificate Validation (bsc#1276541).
  • CVE-2026-78131: Memory Leaks When Parsing Attribute Certificates (bsc#1276543).
  • CVE-2026-78132: Infinite Loop When Parsing Attribute Certificates (bsc#1276544).
  • CVE-2026-78133: Use-After-Free During Multi-KE Rekey Collision (bsc#1276545).
  • CVE-2026-78134: Missing Inner EAP Method Authentication Details (bsc#1276548).
  • CVE-2026-78135: Creation of a Child SA Pre-Authentication (bsc#1276549).
Record
SUSE-SU-2026:24199-1
Updated
2026-11-02
OSVUSN-8789-1 No score

strongswan vulnerabilities

It was discovered that strongSwan incorrectly handled PKCS#7 containers in the openssl plugin. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-78123)

It was discovered that strongSwan incorrectly handled memory when enumerating certificates in PKCS#7 containers in the openssl plugin. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-78124)

It was discovered that strongSwan incorrectly handled AKA-Synchronization-Failure messages in the eap-aka plugin. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-78126)

It was discovered that strongSwan incorrectly handled memory when stringifying IKE messages. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-78127)

It was discovered that strongSwan incorrectly handled PKCS#5 decryption. A remote attacker could possibly use this issue to cause strongSwan to consume excessive resources, leading to a denial of service. (CVE-2026-78129)

It was discovered that strongSwan incorrectly handled attribute certificates in the x509 plugin when the issuer name was missing. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-78130)

It was discovered that strongSwan incorrectly handled memory when parsing attribute certificates in the x509 plugin. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-78131)

It was discovered that strongSwan incorrectly handled attribute certificates containing ietfAttrSyntax values in the x509 plugin. A remote attacker could possibly use this issue to cause strongSwan to consume excessive resources, leading to a denial of service. (CVE-2026-78132)

It was discovered that strongSwan incorrectly handled IKEv2 rekeying collisions with multi-key exchange. A remote attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-78133)

It was discovered that strongSwan incorrectly validated inner EAP method authentication details in the eap-ttls and eap-peap plugins. An authenticated user could possibly use this issue to bypass authentication. (CVE-2026-78134)

It was discovered that strongSwan incorrectly handled CREATE_CHILD_SA requests on unestablished IKE_SAs. A remote attacker could possibly use this issue to bypass authentication. (CVE-2026-78135)

Record
USN-8789-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
strongswan
Azure Linux:3
 through 5.9.14-11 None known
strongswan
Debian:13
 before 6.0.1-6+deb13u7, plus listed versions
6.0.1-66.0.1-6+deb13u16.0.1-6+deb13u26.0.1-6+deb13u46.0.1-6+deb13u56.0.1-6+deb13u6
6.0.1-6+deb13u7
strongswan
Debian:14
 before 6.1.0-1, plus listed versions
6.0.1-66.0.2-16.0.3-16.0.4-16.0.5-16.0.6-16.0.7-1
6.1.0-1
strongswan
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 6.0.6-160000.3.1
6.0.6-160000.3.1
strongswan
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 6.0.6-160000.3.1
6.0.6-160000.3.1
strongswan
Ubuntu:26.04:LTS
 before 6.0.4-1ubuntu3.2, plus listed versions
6.0.1-6ubuntu46.0.1-6ubuntu56.0.4-1ubuntu16.0.4-1ubuntu26.0.4-1ubuntu36.0.4-1ubuntu3.1
6.0.4-1ubuntu3.2
strongswan
Ubuntu:22.04:LTS
From an advisory covering 11 CVEs
 before 5.9.5-2ubuntu2.8, plus listed versions
5.9.1-1ubuntu35.9.1-1ubuntu3.15.9.4-1ubuntu15.9.4-1ubuntu25.9.4-1ubuntu3
Show 10 moreShow less
5.9.4-1ubuntu45.9.5-2ubuntu15.9.5-2ubuntu25.9.5-2ubuntu2.15.9.5-2ubuntu2.25.9.5-2ubuntu2.35.9.5-2ubuntu2.45.9.5-2ubuntu2.55.9.5-2ubuntu2.65.9.5-2ubuntu2.7
5.9.5-2ubuntu2.8
strongswan
Ubuntu:24.04:LTS
From an advisory covering 11 CVEs
 before 5.9.13-2ubuntu4.24.04.5, plus listed versions
5.9.11-1ubuntu15.9.11-1ubuntu25.9.12-1ubuntu15.9.13-2ubuntu15.9.13-2ubuntu3
Show 5 moreShow less
5.9.13-2ubuntu45.9.13-2ubuntu4.24.04.15.9.13-2ubuntu4.24.04.25.9.13-2ubuntu4.24.04.35.9.13-2ubuntu4.24.04.4
5.9.13-2ubuntu4.24.04.5
strongswan
Ubuntu:26.04:LTS
From an advisory covering 11 CVEs
 before 6.0.4-1ubuntu3.2, plus listed versions
6.0.1-6ubuntu46.0.1-6ubuntu56.0.4-1ubuntu16.0.4-1ubuntu26.0.4-1ubuntu36.0.4-1ubuntu3.1
6.0.4-1ubuntu3.2
strongswan
openSUSE:Tumbleweed
From an advisory covering 9 CVEs
 before 6.1.0-1.1
6.1.0-1.1
strongswan
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 6.0.6-160000.3.1
6.0.6-160000.3.1

History

History
RecordedChangedSources
affected, facts
affected, aliases
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-78133 is a high vulnerability (CVSS 7.5) in Strongswan, published September 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 40th percentile. Fixed in strongswan 6.0.1-6+deb13u7.

References

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