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Improper Verification of Cryptographic Signature The advisory has been revoked - it doesn't affect any version of package libreswan-minimal  (opens in a new tab)

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EPSS
0.35% (28th percentile)

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  • Snyk IDSNYK-RHEL10-LIBRESWANMINIMAL-17973495
  • published15 Jul 2026
  • disclosed24 Jun 2026
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Introduced: 24 Jun 2026

CVE-2026-50722  (opens in a new tab)
CWE-347  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libreswan-minimal package and not the libreswan-minimal package as distributed by RHEL.

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.