CVE-2026-25075

strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25075.json",
    "cwe_ids": [
        "CWE-191",
        "CWE-476"
    ],
    "cna_assigner": "VulnCheck"
}

References

Affected packages

Git / github.com/strongswan/strongswan

Affected ranges

Type

GIT

Repo

https://github.com/strongswan/strongswan

Events

Introduced

327aa0c0120feef11c5a4bdba77a7d26875c9e60

Fixed

a05dfdc3fffda409e83fdf9e7c5e5e423c7c1e02

Database specific

{
    "extracted_events": [
        {
            "introduced": "4.5.0"
        },
        {
            "fixed": "6.0.5"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

4.*

4.5.0

4.5.1

4.5.2

4.5.3

4.6.0

4.6.1

4.6.2

4.6.3

5.*

5.0.0

5.0.1

5.0.2

5.0.2dr4

5.0.2rc1

5.0.3

5.0.3dr1

5.0.3dr2

5.0.3dr3

5.0.3rc1

5.0.4

5.1.0

5.1.0dr1

5.1.0dr2

5.1.0rc1

5.1.1

5.1.1dr1

5.1.1dr2

5.1.1dr3

5.1.1dr4

5.1.1rc1

5.1.2

5.1.2.dr2

5.1.2dr1

5.1.2dr3

5.1.2rc1

5.1.2rc2

5.1.3

5.1.3dr1

5.1.3rc1

5.2.0

5.2.0dr1

5.2.0dr2

5.2.0dr3

5.2.0dr4

5.2.0dr5

5.2.0dr6

5.2.0rc1

5.2.1

5.2.1dr1

5.2.1rc1

5.2.2

5.2.2dr1

5.2.2rc1

5.3.0

5.3.0dr1

5.3.0rc1

5.3.1

5.3.1dr1

5.3.1rc1

5.3.2

5.3.3

5.3.3dr1

5.3.3dr3

5.3.3dr4

5.3.3dr5

5.3.3dr6

5.3.3rc2

5.3.4

5.3.4dr1

5.3.4dr2

5.3.4dr3

5.3.4rc1

5.3.5

5.4.0

5.4.0dr1

5.4.0dr2

5.4.0dr3

5.4.0dr4

5.4.0dr5

5.4.0dr6

5.4.0dr7

5.4.0dr8

5.4.0rc1

5.4.1dr1

5.4.1dr2

5.4.1dr3

5.4.1dr4

5.5.0

5.5.0dr1

5.5.0rc1

5.5.1

5.5.1dr1

5.5.1dr2

5.5.1dr3

5.5.1dr4

5.5.1dr5

5.5.1rc1

5.5.1rc2

5.5.2

5.5.2dr1

5.5.2dr2

5.5.2dr3

5.5.2dr4

5.5.2dr5

5.5.2dr6

5.5.2dr7

5.5.2rc1

5.5.3

5.5.3dr1

5.5.3dr2

5.6.0

5.6.0dr1

5.6.0dr2

5.6.0dr3

5.6.0dr4

5.6.0rc1

5.6.0rc2

5.6.1

5.6.1dr1

5.6.1dr2

5.6.1dr3

5.6.1rc1

5.6.2

5.6.2dr1

5.6.2dr2

5.6.2dr3

5.6.2dr4

5.6.2rc1

5.6.3

5.6.3dr1

5.6.3dr2

5.6.3rc1

5.7.0

5.7.0dr1

5.7.0dr2

5.7.0dr3

5.7.0dr4

5.7.0dr5

5.7.0dr6

5.7.0dr8

5.7.0rc1

5.7.0rc2

5.7.1

5.7.2

5.7.2dr1

5.7.2dr2

5.7.2dr3

5.7.2dr4

5.7.2rc1

5.8.0

5.8.0dr2

5.8.0rc1

5.8.1

5.8.1dr1

5.8.1rc2

5.8.2

5.8.2dr1

5.8.2dr2

5.8.2rc1

5.8.2rc2

5.8.3

5.8.3rc1

5.8.4

5.9.0

5.9.0dr1

5.9.0dr2

5.9.0rc1

5.9.1

5.9.1dr1

5.9.1rc1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25075.json"