Filtered by vendor Haxx
Subscribe
Total
209 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2026-4873 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 5.9 MEDIUM |
| A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted. | |||||
| CVE-2026-3784 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 6.5 MEDIUM |
| curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection. | |||||
| CVE-2026-3783 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 5.3 MEDIUM |
| When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one. | |||||
| CVE-2026-1965 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 6.5 MEDIUM |
| libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the curl_multi API). | |||||
| CVE-2026-19931 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 9.8 CRITICAL |
| A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection. | |||||
| CVE-2026-18924 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 9.1 CRITICAL |
| A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process. | |||||
| CVE-2026-13608 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 7.4 HIGH |
| A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation. | |||||
| CVE-2026-12064 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 7.5 HIGH |
| When a user invokes curl using a schemeless URL combined with `--proto-default` sftp (or scp), a disconnect occurs between the tool layer and libcurl. The tool layer incorrectly infers the URL scheme, which erroneously bypasses the initialization of critical SSH security options like CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the libcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes the connection via SFTP/SCP as specified. Because the tool layer skipped the security configuration, these SSH host verification options are silently omitted, causing curl to connect to an unverified SSH remote host without throwing an error. | |||||
| CVE-2026-11856 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 9.8 CRITICAL |
| Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`. | |||||
| CVE-2026-11586 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 7.5 HIGH |
| By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages. | |||||
| CVE-2026-11564 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 9.1 CRITICAL |
| libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer. | |||||
| CVE-2026-11352 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 7.5 HIGH |
| An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client. | |||||
| CVE-2026-10536 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 9.8 CRITICAL |
| A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation. | |||||
| CVE-2025-14524 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 5.3 MEDIUM |
| When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a cross-protocol redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the bearer token to the new target host. | |||||
| CVE-2025-14017 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 6.3 MEDIUM |
| When doing multi-threaded LDAPS transfers (LDAP over TLS) with libcurl, changing TLS options in one thread would inadvertently change them globally and therefore possibly also affect other concurrently setup transfers. Disabling certificate verification for a specific transfer could unintentionally disable the feature for other threads as well. | |||||
| CVE-2025-13034 | 1 Haxx | 1 Curl | 2026-09-15 | N/A | 5.9 MEDIUM |
| When using `CURLOPT_PINNEDPUBLICKEY` option with libcurl or `--pinnedpubkey` with the curl tool, curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the connection without performing the proper check, thus not noticing a possible impostor. To skip this check, the connection had to be done with QUIC with ngtcp2 built to use GnuTLS and the user had to explicitly disable the standard certificate verification. | |||||
| CVE-2026-3805 | 1 Haxx | 1 Curl | 2026-09-14 | N/A | 7.5 HIGH |
| When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory. | |||||
| CVE-2026-7009 | 1 Haxx | 1 Curl | 2026-06-17 | N/A | 5.3 MEDIUM |
| When curl is told to use the Certificate Status Request TLS extension, often referred to as *OCSP stapling*, to verify that the server certificate is valid, it fails to detect OCSP problems and instead wrongly consider the response as fine. | |||||
| CVE-2025-5399 | 1 Haxx | 1 Curl | 2026-06-17 | N/A | 7.5 HIGH |
| Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application. | |||||
| CVE-2025-5025 | 1 Haxx | 1 Curl | 2026-06-17 | N/A | 4.8 MEDIUM |
| libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing. | |||||