Total
5376 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2021-23336 | 6 Debian, Djangoproject, Fedoraproject and 3 more | 12 Debian Linux, Django, Fedora and 9 more | 2026-10-14 | 4.0 MEDIUM | 5.9 MEDIUM |
| The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter. | |||||
| CVE-2021-22947 | 8 Apple, Debian, Fedoraproject and 5 more | 34 Macos, Debian Linux, Fedora and 31 more | 2026-10-14 | 4.3 MEDIUM | 5.9 MEDIUM |
| When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server. | |||||
| CVE-2021-22946 | 8 Apple, Debian, Fedoraproject and 5 more | 37 Macos, Debian Linux, Fedora and 34 more | 2026-10-14 | 5.0 MEDIUM | 7.5 HIGH |
| A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network. | |||||
| CVE-2021-22945 | 8 Apple, Debian, Fedoraproject and 5 more | 25 Macos, Debian Linux, Fedora and 22 more | 2026-10-14 | 5.8 MEDIUM | 9.1 CRITICAL |
| When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*. | |||||
| CVE-2021-22925 | 7 Apple, Fedoraproject, Haxx and 4 more | 27 Mac Os X, Macos, Fedora and 24 more | 2026-10-14 | 5.0 MEDIUM | 5.3 MEDIUM |
| curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application. | |||||
| CVE-2021-22924 | 7 Debian, Fedoraproject, Haxx and 4 more | 53 Debian Linux, Fedora, Libcurl and 50 more | 2026-10-14 | 4.3 MEDIUM | 3.7 LOW |
| libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate. | |||||
| CVE-2021-22923 | 6 Fedoraproject, Haxx, Netapp and 3 more | 23 Fedora, Curl, Cloud Backup and 20 more | 2026-10-14 | 2.6 LOW | 5.3 MEDIUM |
| When curl is instructed to get content using the metalink feature, and a user name and password are used to download the metalink XML file, those same credentials are then subsequently passed on to each of the servers from which curl will download or try to download the contents from. Often contrary to the user's expectations and intentions and without telling the user it happened. | |||||
| CVE-2021-22922 | 6 Fedoraproject, Haxx, Netapp and 3 more | 23 Fedora, Curl, Cloud Backup and 20 more | 2026-10-14 | 4.3 MEDIUM | 6.5 MEDIUM |
| When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload. It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk. | |||||
| CVE-2021-22898 | 6 Debian, Fedoraproject, Haxx and 3 more | 12 Debian Linux, Fedora, Curl and 9 more | 2026-10-14 | 2.6 LOW | 3.1 LOW |
| curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol. | |||||
| CVE-2021-22890 | 8 Broadcom, Debian, Fedoraproject and 5 more | 11 Fabric Operating System, Debian Linux, Fedora and 8 more | 2026-10-14 | 4.3 MEDIUM | 3.7 LOW |
| curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check. | |||||
| CVE-2021-22876 | 8 Broadcom, Debian, Fedoraproject and 5 more | 12 Fabric Operating System, Debian Linux, Fedora and 9 more | 2026-10-14 | 5.0 MEDIUM | 5.3 MEDIUM |
| curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request. | |||||
| CVE-2021-20305 | 5 Debian, Fedoraproject, Netapp and 2 more | 6 Debian Linux, Fedora, Active Iq Unified Manager and 3 more | 2026-10-14 | 6.8 MEDIUM | 8.1 HIGH |
| A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability. | |||||
| CVE-2021-20232 | 3 Fedoraproject, Gnu, Redhat | 3 Fedora, Gnutls, Enterprise Linux | 2026-10-14 | 7.5 HIGH | 9.8 CRITICAL |
| A flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and other potential consequences. | |||||
| CVE-2021-20231 | 4 Fedoraproject, Gnu, Netapp and 1 more | 5 Fedora, Gnutls, Active Iq Unified Manager and 2 more | 2026-10-14 | 7.5 HIGH | 9.8 CRITICAL |
| A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences. | |||||
| CVE-2021-3997 | 3 Fedoraproject, Redhat, Systemd Project | 3 Fedora, Enterprise Linux, Systemd | 2026-10-14 | N/A | 5.5 MEDIUM |
| A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp. | |||||
| CVE-2021-3826 | 2 Fedoraproject, Gnu | 2 Fedora, Gcc | 2026-10-14 | N/A | 6.5 MEDIUM |
| Heap/stack buffer overflow in the dlang_lname function in d-demangle.c in libiberty allows attackers to potentially cause a denial of service (segmentation fault and crash) via a crafted mangled symbol. | |||||
| CVE-2021-3737 | 6 Canonical, Fedoraproject, Netapp and 3 more | 17 Ubuntu Linux, Fedora, Hci and 14 more | 2026-10-14 | 7.1 HIGH | 7.5 HIGH |
| A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability. | |||||
| CVE-2021-3733 | 4 Fedoraproject, Netapp, Python and 1 more | 20 Extra Packages For Enterprise Linux, Fedora, Hci Compute Node Firmware and 17 more | 2026-10-14 | 4.0 MEDIUM | 6.5 MEDIUM |
| There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability. | |||||
| CVE-2021-3537 | 6 Debian, Fedoraproject, Netapp and 3 more | 20 Debian Linux, Fedora, Active Iq Unified Manager and 17 more | 2026-10-14 | 4.3 MEDIUM | 5.9 MEDIUM |
| A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability. | |||||
| CVE-2021-3518 | 6 Debian, Fedoraproject, Netapp and 3 more | 19 Debian Linux, Fedora, Active Iq Unified Manager and 16 more | 2026-10-14 | 6.8 MEDIUM | 8.8 HIGH |
| There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability. | |||||