81 results · Feed
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Medium 6.3
broken TLS options for threaded LDAPS
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…
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Medium 4.3
missing SFTP host verification with wolfSSH
curl's code for managing SSH connections when SFTP was done using the wolfSSH powered backend was flawed and missed host verification mechanisms. This prevents curl from detecting MITM attackers and more.
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Medium 5.3
predictable WebSocket mask
curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious se…
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Low 3.3
cmake cmForEachCommand.cxx ReplayItems assertion
A vulnerability was determined in cmake 4.1.20250725-gb5cce23. This affects the function cmForEachFunctionBlocker::ReplayItems of the file cmForEachCommand.cxx. This manipulation causes reachable assertion. The attack needs to be launched locally. The exploit…
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Low 3.9
Libarchive: reading past eof may be triggered for piped file streams
A vulnerability has been identified in the libarchive library. This flaw can be triggered when file streams are piped into bsdtar, potentially allowing for reading past the end of the file. This out-of-bounds read can lead to unintended consequences, includin…
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Low 2.8
Libarchive: off by one error in build_ustar_entry_name() at archive_write_set_format_pax.c
A vulnerability has been identified in the libarchive library. This flaw involves an 'off-by-one' miscalculation when handling prefixes and suffixes for file names. This can lead to a 1-byte write overflow. While seemingly small, such an overflow can corrupt …
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Low 3.9
Libarchive: integer overflow while reading warc files at archive_read_support_format_warc.c
A vulnerability has been identified in the libarchive library. This flaw involves an integer overflow that can be triggered when processing a Web Archive (WARC) file that claims to have more than INT64_MAX - 4 content bytes. An attacker could craft a maliciou…
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Medium 4.8CVE-2025-5025 Public exploit
No QUIC certificate pinning with wolfSSL
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, faili…
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Medium 6.5
QUIC certificate check skip with wolfSSL
libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.
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High 7.5
Null Pointer Dereference vulnerability in libarchive 3.7.6 and earlier when running program bsdtar in function header_p…
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Low 3.4
netrc and redirect credential leak
When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, curl could leak the password used for the first host to the followed-to host under certain circumstances. This flaw only manifests itself if the netrc file has an entry that …
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Medium 5.9
HSTS subdomain overwrites parent cache entry
When curl is asked to use HSTS, the expiry time for a subdomain might overwrite a parent domain's cache entry, making it end sooner or later than otherwise intended. This affects curl using applications that enable HSTS and use URLs with the insecure `HTTP://…
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Medium 6.5
OCSP stapling bypass with GnuTLS
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 might fail to detect some OCSP problems and instead wrongly consider the response as fine. If the ret…
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Medium 6.3CVE-2024-7264 EPSS 20%
ASN.1 date parser overread
libcurl's ASN1 parser code has the `GTime2str()` function, used for parsing an ASN.1 Generalized Time field. If given an syntactically incorrect field, the parser might end up using -1 for the length of the *time fraction*, leading to a `strlen()` getting per…
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Low 3.1
macidn punycode buffer overread
libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to us…
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High 7.5
freeing stack buffer in utf8asn1str
libcurl's ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string. Itcan detect an invalid field and return error. Unfortunately, when doing so it also invokes `free()` on a 4 byte localstack buffer. Most modern malloc implementatio…
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Medium 5.3CVE-2024-28182 EPSS 82%
Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage
nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. The nghttp2 library prior to version 1.61.0 keeps reading the unbounded number of HTTP/2 CONTINUATION frames even after a stream is reset to keep HPACK context in sync. This cause…
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Medium 6.5
TLS certificate check bypass with mbedTLS
libcurl did not check the server certificate of TLS connections done to a host specified as an IP address, when built to use mbedTLS. libcurl would wrongly avoid using the set hostname function when the specified hostname was given as an IP address, therefore…
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Medium 6.3
QUIC certificate check bypass with wolfSSL
libcurl skips the certificate verification for a QUIC connection under certain conditions, when built to use wolfSSL. If told to use an unknown/bad cipher or curve, the error path accidentally skips the verification and returns OK, thus ignoring any certifica…
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High 8.6CVE-2024-2398 EPSS 36%
HTTP/2 push headers memory-leak
When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for the push surpasses the maximum allowed limit (1000), libcurl aborts the server push. When aborting, libcurl inadvertently does not free all the prev…
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Low 3.5
Usage of disabled protocol
When a protocol selection parameter option disables all protocols without adding any then the default set of protocols would remain in the allowed set due to an error in the logic for removing protocols. The below command would perform a request to curl.se wi…
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High 7.3
Improper Domain Lookup that potentially leads to SSRF attacks in libuv
libuv is a multi-platform support library with a focus on asynchronous I/O. The `uv_getaddrinfo` function in `src/unix/getaddrinfo.c` (and its windows counterpart `src/win/getaddrinfo.c`), truncates hostnames to 256 characters before calling `getaddrinfo`. Th…
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Medium 5.3
When saving HSTS data to an excessively long file name, curl could end up removing all contents, making subsequent requ…
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Medium 6.5
This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than …
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High 8.8
This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the h…
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Unscored —
This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the specific series of …
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High 7.5
HTTP/2 Stream Cancellation Attack
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
KEV Oct 10, 2023 -
High 7.5
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of p…
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Medium 5.9
A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for res…
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Medium 5.3
An information disclosure vulnerability exists in curl <v8.1.0 when doing HTTP(S) transfers, libcurl might erroneously …
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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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Medium 5.9
An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in …
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High 7.7
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH c…
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Medium 5.9
An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously…
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Unscored —
A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing wa…
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High 8.8
A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly r…
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Medium 6.5
A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functiona…
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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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Medium 6.5
An allocation of resources without limits or throttling vulnerability exists in curl <v7.88.0 based on the "chained" HT…
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Medium 5.9
A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it support…