curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication

A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the...

Moderate: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

An update for Red Hat Hardened Images RPMs is now available. This update includes the following RPMs: curl: curl-8.19.0-3.hum1 aarch64, x8664 libcurl-8.19.0-3.hum1 aarch64, x8664 libcurl-devel-8.19.0-3.hum1 aarch64, x8664 libcurl-minimal-8.19.0-3.hum1 aarch64, x8664 curl-8.19.0-3.hum1.src source...

curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect

A flaw was found in curl. When an OAuth2 bearer token is used for an HTTPS transfer that redirects to a second URL, curl could unintentionally leak the token. This occurs if the second hostname has entries in the .netrc file, allowing the bearer token intended for the first host to be sent to the...

curl: Host verification bypass during SSH transfers

A flaw was found in curl. When performing SSH-based transfers using SCP or SFTP, libcurl could mistakenly connect to hosts not listed in the user-specified knownhosts file. This occurs if the host is present in the libssh global knownhosts file, effectively bypassing the intended host verificatio...

CVE-2026-33752

CVE-2026-33752 affects the Python binding curl_cffi for libcurl. Before version 0.15.0, curl_cffi does not restrict outbound requests to internal IP ranges and follows redirects automatically via libcurl. This enables an attacker-controlled URL to redirect to internal services (e.g., cloud metada...

CVE-2026-33752 Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)

curlcffi is the a Python binding for curl. Prior to 0.15.0, curlcffi does not restrict requests to internal IP ranges, and follows redirects automatically via the underlying libcurl. Because of this, an attacker-controlled URL can redirect requests to internal services such as cloud metadata...

CVE-2026-33752 Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)

curlcffi is the a Python binding for curl. Prior to 0.15.0, curlcffi does not restrict requests to internal IP ranges, and follows redirects automatically via the underlying libcurl. Because of this, an attacker-controlled URL can redirect requests to internal services such as cloud metadata...

curl_cffi 代码问题漏洞

curlcffi is a Python HTTP client library developed by Lexiforest personal developers, which supports browser fingerprint simulation. Versions of curlcffi prior to 0.15.0 have code vulnerabilities. These vulnerabilities stem from the lack of restrictions on requests directed to internal IP ranges,...

curl: CVE-2026-5773: wrong reuse of SMB connection

A vulnerability was discovered in curl version 8.19.0 and earlier versions that support SMB. The vulnerability was due to the incorrect reuse of SMB connections across different shares on the same server. This led to data spoofing and access control bypass. The issue was caused by the lack of...

curl: no_proxy IDN mismatch: Unicode hostnames bypass proxy exclusion list

Summary Unicode IDN hostnames in noproxy are never converted to punycode before comparison, so they never match the request hostname which curl has already converted to punycode. A user who types noproxy="bücher.de" and requests http://bücher.de/ expects the proxy to be bypassed. Instead curl...

curl: Improper enforcement of CURLOPT_SOCKS5_AUTH due to missing reuse key validation in libcurl

detail: - lib/setopt.c:1048-1051 - CURLOPTSOCKS5AUTH is stored into data-set.socks5auth - lib/socks.c:597-641 socks5req0init - fresh SOCKS5 handshake reads data-set.socks5auth, if BASIC is not allowed, it clears sx-proxyuser at 618-620, so username/password auth is not even offered -...

Server-side Request Forgery (SSRF)

Overview curl-cffi is a python binding for curl-impersonate via cffi. Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the handling of user-supplied URLs and automatic redirect following in the get function. An attacker can access internal network resources...

curl: Internal application wrapper or script using curl

While -guid is not a standard or documented curl command, a Command Injection or Argument Injection vulnerability within a specific application that wraps curl. Security Analysis: curl -guid -url example.com 1. Status of the "-guid" FlagUndocumented/Non-existent: The official curl binary does not...

SUSE: Security Advisory (SUSE-SU-2026:20918-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

PT-2026-30271

Name of the Vulnerable Software and Affected Versions curl cffi affected versions not specified Description curl cffi does not restrict requests to internal IP ranges and automatically follows redirects via libcurl. This allows an attacker-controlled URL to redirect requests to internal services,...

HTTP Fetch, Reverse TCP Stager (RC4 Stage Encryption, Metasm)

Fetch and execute an x86 payload from an HTTP server. Connect back to the attacker Module Options msf use payload/cmd/windows/http/x86/peinject/reversetcprc4 msf payloadreversetcprc4 show actions ...actions... msf payloadreversetcprc4 set ACTION msf payloadreversetcprc4 show options ...show and s...

HTTPS Fetch, Windows Reverse HTTP Stager (wininet)

Fetch and execute an x86 payload from an HTTPS server. Tunnel communication over HTTP Windows wininet Module Options msf use payload/cmd/windows/https/x86/meterpreter/reversehttp msf payloadreversehttp show actions ...actions... msf payloadreversehttp set ACTION msf payloadreversehttp show option...

HTTPS Fetch, Reverse TCP Stager (DNS)

Fetch and execute an x86 payload from an HTTPS server. Connect back to the attacker Module Options msf use payload/cmd/windows/https/x86/meterpreter/reversetcpdns msf payloadreversetcpdns show actions ...actions... msf payloadreversetcpdns set ACTION msf payloadreversetcpdns show options ...show...

HTTP Fetch, Bind TCP Stager with UUID Support (Windows x86)

Fetch and execute an x86 payload from an HTTP server. Listen for a connection with UUID Support Windows x86 Module Options msf use payload/cmd/windows/http/x86/vncinject/bindtcpuuid msf payloadbindtcpuuid show actions ...actions... msf payloadbindtcpuuid set ACTION msf payloadbindtcpuuid show...

curl: CVE-2026-5545: wrong reuse of HTTP Negotiate connection

Summary: An attacker sharing a libcurl multi-handle connection pool can hijack another user's Negotiate/Kerberos-authenticated connection. When User A authenticates via Negotiate SPNEGO and the connection returns to the pool, User B using CURLAUTHANY with different credentials gets that connectio...