SB2026042955 - Multiple vulnerabilities in curl
Published: April 29, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Cleartext transmission of sensitive information (CVE-ID: CVE-2026-4873)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to connection reuse ignores TLS requirement. A remote attacker can gain access to sensitive data.
2) Authentication Bypass by Primary Weakness (CVE-ID: CVE-2026-5545)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to wrong reuse of HTTP Negotiate authentication connection. A remote attacker can execute arbitrary requests under the wrong user context.
3) Authentication Bypass by Capture-replay (CVE-ID: CVE-2026-7168)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to authentication bypass by capture-replay. A remote attacker can leak and reuse Digest proxy authentication state across proxies to impersonate the client.
4) Improper Certificate Validation (CVE-ID: CVE-2026-7009)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improper certificate validation within OCSP stapling with Apple SecTrust. A remote attacker can cause invalid certificates to be accepted as trusted.
5) Information disclosure (CVE-ID: CVE-2026-6429)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application when reused proxy connection. A remote attacker can gain unauthorized access to sensitive information on the system.
6) Origin validation error (CVE-ID: CVE-2026-6276)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to origin validation error within stale custom cookie host. A remote attacker can gain access to sensitive information on the system.
7) Insufficiently protected credentials (CVE-ID: CVE-2026-6253)
The vulnerability allows a remote attacker to gain access to sensitive information on the system.
The vulnerability exists due to insufficiently protected credentials over redirect-to proxy. A remote attacker can gain access to sensitive information on the system.
8) Exposure of Data Element to Wrong Session (CVE-ID: CVE-2026-5773)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper reuse of connection for SMB(S) transfers. A remote attacker can gain access to sensitive information on the system.
Remediation
Install update from vendor's website.
References
- https://curl.se/docs/CVE-2026-4873.html
- https://curl.se/docs/CVE-2026-5545.html
- https://curl.se/docs/CVE-2026-7168.html
- https://curl.se/docs/CVE-2026-7009.html
- https://curl.se/docs/CVE-2026-6429.html
- https://curl.se/docs/CVE-2026-6276.html
- https://curl.se/docs/CVE-2026-6253.html
- https://curl.se/docs/CVE-2026-5773.html