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Critical 9.1
Authorization: Negotiate sent to foreign origin
When processing an HTTP redirect to a URL containing userinfo (a `username:password` component), curl might erroneously retain and re-transmit the original host's HTTP Negotiate authentication state. Consequently, a malicious server can trigger a redirect con…
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Critical 9.1
FTP wildcard write callback mixup
When an FTP wildcard `LIST` operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data pointing directly to the easy handle. Subsequent reuse of …
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Critical 9.1
wolfSSL public-key pinning bypass
When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer does not possess. During the TLS handshake, wolfSSL validates the connection, but curl's subsequent re-parsing of the same certificate - tricked by a m…
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Critical 9.1
cross-origin reuse of a Negotiate connection
When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.
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Critical 9.1
leaking host credentials to HTTP proxy
An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the `CONNECT` tunnel request with 401 `WWW-Authenticate:` instead of the expected 407 `Proxy-Authenticate:…
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Critical 9.1
Negotiate credentials sent to redirected origin
When using an *ambient user* in a first transfer doing Negotiate authentication and asked to follow redirects, curl could pass on its credential details to an unrelated second origin when asked to redirect there.
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Critical 9.1
FTP connection reuse inherits client-certificate
An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP control connection that a previous easy handle upgraded with `STARTTLS` and authenticated using a client certificate. The second handle performs neither a new TLS handshake nor a ne…
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Critical 9.8
Negotiate ambient user conn reuse
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 con…
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Critical 9.1
HTTP/2 server push UAF
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.
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Critical 9.8
stale proxy password leak
libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.
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Critical 9.1
env-set cross-proxy Digest auth state leak
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 Diges…
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Critical 9.1
password leak with netrc and user in URL
When asking curl to use a `.netrc` file to find credentials and at the same time specifying a URL with a username (without a password), like `https://user@example.com/`, curl could wrongly get and use the password for *another* user set in the `.netrc` file f…
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Critical 9.8
SASL double-free
The curl logic that works with SASL authentication could end up cleaning up the GSASL context *twice* without clearing the pointer in between, making it `free()` the same pointer twice.
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Critical 9.1
trailing dot domain super cookie
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-p…
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Critical 9.8
cross-origin Digest auth state leak
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 `Authori…
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Critical 9.1
Native CA trust persist
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 swi…
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Critical 9.8
HTTP/2 stream-dependency tree UAF
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…
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Critical 9.8
A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an att…
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Critical 9.1
A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functiona…
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Critical 9.8
When doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data …
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Critical 9.8CVE-2022-32207 EPSS 12%
When curl < 7.84.0 saves cookies, alt-svc and hsts data to local files, it makes the operation atomic by finalizing the…
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Critical 9.1
When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointe…
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Critical 9.8CVE-2019-5482 EPSS 18%
Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.
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Critical 9.8
Double-free vulnerability in the FTP-kerberos code in cURL 7.52.0 to 7.65.3.
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Critical 9.1
curl version curl 7.20.0 to and including curl 7.59.0 contains a CWE-126: Buffer Over-read vulnerability in denial of s…
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Critical 9.8CVE-2018-1000120 EPSS 12%
curl FTP path confusion leads to NIL byte out of bounds write
A buffer overflow exists in curl 7.12.3 to and including curl 7.58.0 in the FTP URL handling that allows an attacker to cause a denial of service or worse.
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Critical 9.8
The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denia…
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Critical 9.8CVE-2017-8817 EPSS 11%
The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-o…
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Critical 9.1
An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the da…