CVE-2026-50721
- Source
- https://cve.org/CVERecord?id=CVE-2026-50721
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50721.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-50721
- Downstream
- Published
- 2026-07-02T22:16:43.367Z
- Modified
- 2026-07-11T04:04:08.492572705Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Libreswan, via the function RSAauthenticatehashsignatureraw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a variation on the Bleichenbacher attack to forge the SIG payload when small public exponents are being used (e.g., e=3), which could lead to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the SIG 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 remote IKE peers are not affected.
- References
Affected packages
Git / github.com/libreswan/libreswan
Affected ranges
- Type
- GIT
- Repo
- https://github.com/libreswan/libreswan
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "source": "CPE_RANGE", "cpe": "cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "5.3.1" } ] }