Affected: AlmaLinux:9: curl, AlmaLinux:9: curl-minimal, AlmaLinux:9: libcurl, AlmaLinux:9: libcurl-devel, AlmaLinux:9: libcurl-minimal

The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.

Security Fix(es):

* curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965) * curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783) * curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547) * curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected: Alpaquita:23: curl, Alpaquita:25: curl, Alpaquita:stream: curl, BellSoft Hardened Containers:stream: curl

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

Affected: openEuler:20.03-LTS-SP4: curl

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols. Security Fix(es):

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.(CVE-2026-8286)

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.(CVE-2026-8924)

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.(CVE-2026-8927)

When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly e…

curl-8.21.0-1.1 on GA media

curl: curl: Insecure connection establishment due to TLS configuration mismatch curl: libcurl: Unauthorized connection reuse due to a logical error curl: curl: Cookie injection via malicious HTTP server using super cookies curl: curl: Double-free vulnerability in SASL authentication curl: curl: Information disclosure via incorrect .netrc password lookup curl: Information disclosure due to uncleared proxy authentication state libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials libcurl: libcurl: Use-after-free via curl_easy_pause() in CURLMOPT_SOCKETFUNCTION callback libcurl: libcurl: Information disclosure due to persistent Referer header curl: curl: Man-in-the-middle attack via SSH host key bypass curl: libcurl: curl/libcurl: Remote denial of service via QUIC UDP receive function vulnerability libcurl: libcurl: Certificate validation bypass due to incorrect connection reuse curl: curl: Denial of Service via WebSocket PING flood curl: curl: Information disclosure via incorrect Digest authentication header reuse curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP

Affected: Rocky Linux:9: curl

The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.

Security Fix(es):

* curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)

* curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)

* curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)

* curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Security update for curl

Affected: Ubuntu:Pro:14.04:LTS: curl, Ubuntu:Pro:16.04:LTS: curl, Ubuntu:Pro:18.04:LTS: curl, Ubuntu:Pro:20.04:LTS: curl, Ubuntu:22.04:LTS: curl, Ubuntu:24.04:LTS: curl, Ubuntu:25.10: curl, Ubuntu:26.04:LTS: curl

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

The vulnerabilities found in LabX Standard versions 21.3.22 - 21.4.23 are CVE-2025-69419, CVE-2026-0915, CVE-2025-15467, CVE-2026-4800, CVE-2026-33186, CVE-2026-39821, CVE-2026-33671 and are fixed in LabX Standard v21.4.25.

The vulnerabilities found in LabX Enterprise versions 21.3.22 - 21.4.23 are CVE-2026-4800, CVE-2026-33186, CVE-2026-39821, CVE-2026-33671 and are fixed in LabX Enterprise v21.4.25

All other vulnerabilities are to be fixed in the upcoming releases.

Ein Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um Sicherheitsvorkehrungen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand zu verursachen.