{"id":"AZL-91776","summary":"CVE-2026-50722 affecting package libreswan for versions less than 4.15-2","details":"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.","modified":"2026-09-20T05:33:47Z","published":"2026-07-02T22:16:43Z","upstream":["CVE-2026-50722"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50722"}],"affected":[{"package":{"name":"libreswan","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/libreswan"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-91776.json"}}],"schema_version":"1.9.0"}