CVE-2026-50722 Affecting libreswan-debugsource package, versions <0:4.12-2.el8_10.6


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.35% (26th percentile)

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  • Snyk IDSNYK-ROCKY8-LIBRESWANDEBUGSOURCE-18384964
  • published29 Jul 2026
  • disclosed2 Jul 2026

Introduced: 2 Jul 2026

CVE-2026-50722  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 libreswan-debugsource to version 0:4.12-2.el8_10.6 or higher.
This issue was patched in RLSA-2026:46396.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libreswan-debugsource package and not the libreswan-debugsource package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1