CVE-2026-6276 stale custom cookie host causes cookie leak

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second reques...

CVE-2026-6253

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

CVE-2026-6253

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

CVE-2026-6253 proxy credentials leak over redirect-to proxy

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

CVE-2026-6253

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

CVE-2026-6253 proxy credentials leak over redirect-to proxy

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

CVE-2026-5545

CVE-2026-5545 affects libcurl: a logical error in connection reuse can cause a request to a server usingNegotiate authentication with user1:password1 to be mistakenly sent over a connection still authenticated for user1 when a second operation tries to authenticate as user2:password2 on the same ...

curl security vulnerabilities

curl is an open-source tool developed by cURL for transferring data from or to a server. There is a security vulnerability in curl, which stems from a failure in OCSP binding detection. This failure may lead to an incorrect assumption that the server’s certificate is valid...

CVE-2026-7009: Improper Certificate Validation

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...

curl security vulnerabilities

curl is an open-source tool developed by cURL, used for transferring data from or to a server. Curl has a security vulnerability, which stems from a logic error in connection reuse. This error may cause TLS-enabled connections to incorrectly reuse existing unencrypted connections, resulting in da...

CVE-2026-6253: Insufficiently Protected Credentials

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. whil...

curl security vulnerabilities

curl is an open-source tool developed by cURL for transferring data from or to a server. Curl has a security vulnerability, which stems from improper handling of .netrc file credentials and HTTP redirection. This vulnerability may lead to password exposure...

curl security vulnerabilities

curl is an open-source tool developed by cURL for transferring data from a server or to a server. Curl has a security vulnerability, which stems from an error in passing the proxy authentication header. This error may cause the Proxy-Authorization header from the first proxy to be incorrectly...

curl security vulnerabilities

curl is an open-source tool developed by cURL for transferring data from a server or to a server. Curl has a security vulnerability that stems from an error in proxy credential transmission, which may lead to the incorrect transmission of credentials from one proxy to another...

CURL Confidential Data Access

The vulnerability of the software for interacting with servers via CURL is related to errors in the certificate validation process. Exploiting this vulnerability can allow a malicious actor to gain access to confidential data...

CVE-2026-43879

CVE-2026-43879 (WWBN/AVideo) describes a blind SSRF in the donation webhook flow. In versions up to 29.0, an authenticated user can configure donation_notification_url to point at internal or RFC1918 hosts (e.g., 127.0.0.1, 169.254.169.254). When another user donates, the server issues a curl POS...

Unity Linux 20.1060e / 20.1070e Security Update: curl (UTSA-2026-017589)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017589 advisory. 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...

Unity Linux 20.1060e / 20.1070e Security Update: curl (UTSA-2026-017588)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017588 advisory. curl supports the -t command line option, known as CURLOPTTELNETOPTIONSin libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Du...

Unity Linux 20.1060e / 20.1070e Security Update: curl (UTSA-2026-017559)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017559 advisory. 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...

Unity Linux 20.1060e / 20.1070e Security Update: curl (UTSA-2026-017661)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017661 advisory. curl 7.7 through 7.76.1 suffers from an information disclosure when the -t command line option, known as CURLOPTTELNETOPTIONS in libcurl, is used to send...