SB2026090401 - SUSE update for curl
Published: September 4, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) Improper restriction of communication channel to intended endpoints (CVE-ID: CVE-2026-13608)
CWE-ID: CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass LDAP server authentication.
The vulnerability exists due to improper restriction of communication channel to intended endpoints in the libcurl SASL negotiation for LDAP authentication when processing an incomplete OpenLDAP SASL handshake sequence. A remote attacker can inject a premature or shortcut response to bypass LDAP server authentication.
The issue only occurs when the OpenLDAP backend is used, and LDAPS is not affected.
2) Exposure of Data Element to Wrong Session (CVE-ID: CVE-2026-5773)
CWE-ID: CWE-488 - Exposure of Data Element to Wrong Session
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
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.
3) Authentication Bypass by Capture-replay (CVE-ID: CVE-2026-7168)
CWE-ID: CWE-294 - Authentication Bypass by Capture-replay
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
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) Use-after-free (CVE-ID: CVE-2026-80229)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to use-after-free in libcurl multi interface connection reuse handling when performing transfers over pooled TLS connections with OpenSSL 3 providers. A remote user can trigger premature easy handle destruction during connection reuse to cause a denial of service.
This affects libcurl built with OpenSSL 3+ provider configurations and also impacts the curl command line tool.
5) Improper Certificate Validation (CVE-ID: CVE-2026-80230)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass public key pinning.
The vulnerability exists due to improper certificate validation in libcurl and the curl command line tool when establishing TLS connections with CURLOPT_PINNEDPUBLICKEY configured and peer and host verification disabled. A remote attacker can present a connection without a server certificate to bypass public key pinning.
This issue is present only when curl is built with OpenSSL or a fork such as BoringSSL, AWS-LC, LibreSSL, or QuicTLS, and the insecure configuration also permits certificate-less connections.
6) Insufficiently protected credentials (CVE-ID: CVE-2026-8926)
CWE-ID: CWE-522 - Insufficiently Protected Credentials
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to use credentials intended for another user.
The vulnerability exists due to insufficiently protected credentials in .netrc credential handling when processing a URL that specifies a username without a password. A remote user can supply a URL with a username that has no matching .netrc entry to use credentials intended for another user.
This issue occurs only when curl is configured to use a .netrc file and the target host has credentials stored for a different user.
Remediation
Install update from vendor's website.