Veille CVE
CVE-2026-50722
5.9 MoyenneDescription
Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.
Produits concernés
Scores CVSS
| Version | Score | Source | Vecteur |
|---|---|---|---|
| 3.1 | 8.1 Élevée | d42dc95b-23f1-4e06-9076-20753a0fb0df | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 5.9 Moyenne | nvd@nist.gov (NVD) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Faiblesses (CWE)
Références
- https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt Vendor AdvisoryMailing List
- https://libreswan.org/security/CVE-2026-50722/ Vendor Advisory
- https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt Vendor Advisory
- https://www.rfc-editor.org/rfc/rfc8017 Technical Description