SB2026062560 - Multiple vulnerabilities in libreswan

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Main Vulnerability Database SB2026062560

SB2026062560 - Multiple vulnerabilities in libreswan

Published: June 25, 2026

Security Bulletin ID SB2026062560
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Reachable assertion (CVE-ID: CVE-2026-12413)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an assertion failure caused by improper bounds checking in reassemble_v2_incoming_fragments() when processing invalidly formatted IKEv2 fragments. A remote attacker can send specially crafted fragmented IKEv2 packets to cause a denial of service.

Only IKEv2 configurations with fragmentation enabled are vulnerable. IKEv1 is not affected.


2) Input validation error (CVE-ID: CVE-2026-50721)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in RSA_authenticate_hash_signature_raw_rsa() when processing an invalidly formatted PKCS#1 v1.5 RSA signature in an IKEv1 SIG payload. A remote attacker can send a specially crafted IKEv1 packet with a shorter than expected hash to cause a denial of service.

The issue affects IKEv1 RSA-SHA1 authentication payload handling and can trigger an assertion that causes libreswan to abort and restart.


3) Input validation error (CVE-ID: CVE-2026-50722)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in RSA_authenticate_hash_signature_pkcs1_1_5_rsa() when processing IKEv2 AUTH payloads encoded using RSASSA-PKCS1-v1_5. A remote attacker can send a specially crafted authentication payload to cause a denial of service.

The issue is triggered by a shorter than expected hash in the AUTH payload, which can lead to an assertion failure and process restart.


Remediation

Install update from vendor's website.

References