curl: libcurl cache updates follow symlinks and truncate their targets

Summary: When curl updates an HSTS, Alt-Svc, or cookie cache, it opens the supplied path with "w" before validating it, so a symlink path can truncate the file it targets. Root cause: Curlfopen calls curlxfopenfilename, "w" before checking the path or creating the safe temporary file, and fopen...

curl: Windows SSPI connection-pool probe can reuse a connection under the wrong user

Summary : A fresh transfer can reuse a keep-alive connection authenticated under another Windows user because the SSPI isolation check trusts a connection ID that a health probe can set. Root cause : Curlcpoolconnseemshealthy calls Curlattachconnection, which sets data-state.recentconnid, while...

Myndr: Myndr CORS Misconfiguration

The CORS configuration on admin.myndr.net allowed any .myndr.net subdomain to read authenticated admin panel responses, including CSRF nonces and session data. This vulnerability could have been exploited to take over admin accounts...

curl: URL API: triple-slash parses path segment as hostname

Summary libcurl's URL API misparses http:///host/path. Per RFC 3986, the authority between // and / is empty, so /host/path is the path. But parseurl in lib/urlapi.c treats the first segment as the hostname. On line 1087, the slash counter i reaches 3, which is within the valid 1-3 range, and hos...

curl: Cookie jar load skips public suffix check on PSL builds

On curl 8.21.0 with libpsl official curl.se 8.21.06 win64, Features: PSL, HTTP Set-Cookie: Domain=co.uk is dropped in verbose. The same cookie loaded from a Netscape jar file or a Set-Cookie: line in that file is accepted and later sent to unrelated hosts under the suffix bank.co.uk, other.co.uk...

curl: curl Missing Sec-WebSocket-Accept Verification Enables MITM WebSocket Session Hijacking

Summary curl's Curlwsaccept function in lib/ws.c processes the 101 Switching Protocols response to a client WebSocket upgrade request. RFC 6455 Section 4.1 mandates that the client MUST verify the Sec-WebSocket-Accept response header by computing the SHA-1 hash of the concatenation of the...

curl: Heap use-after-free (write) in mev_forget_socket() via reentrant curl_easy_pause() — incomplete fix for CVE-2026-9080

lib/multiev.c keeps a hash table multi-ev.shentries of per-socket bookkeeping structs struct mevshentry used to decide when to notify the application's socket callback CURLMOPTSOCKETFUNCTION about interest changes on a socket. CVE-2026-9080 "multi: handle pause in multi socket callback", commit...

curl: SMTP CRLF injection in custom SMTP recipient operand allows additional SMTP commands after authentication

Summary During testing of curl 8.18.0, I observed that CRLF characters embedded in the SMTP recipient operand used with a custom SMTP request are transmitted as additional SMTP commands. The injected commands are accepted and processed after successful SMTP authentication, allowing multiple SMTP...

Liberapay: Unauthenticated team "income/payments" export ignores donor privacy settings (hide_giving, hide_from_lists) and uses frozen visibility, exposing donat

A vulnerability was discovered in the unauthenticated team "income/payments" export feature of Liberapay. The vulnerability allowed an attacker to retrieve donor identity, exact donation amount, and donation dates for public donors, bypassing the donor's explicit privacy settings such as...

Node.js: Permission Model Bypass: `trace_events.createTracing().enable()` Writes Trace Logs Outside `--allow-fs-write`

A flaw in Node.js Permission Model enforcement was discovered that allowed traceevents.createTracing.enable to write trace logs outside of the --allow-fs-write setting. This vulnerability affected Node.js versions 22.x, 24.x, and 26.x...

8x8: JaaS SIP Gateway Authorization Bypass

The JaaS SIP gateway endpoint was validated without verifying the tenant's provisioned entitlements. This allowed tenants to place outbound SIP calls regardless of their subscription level. The issue was promptly addressed by implementing server-side entitlement checks to ensure proper...

curl: heap-use-after-free in curl_easy_cleanup() called from callback

Summary: Curlclose lib/url.c:214 calls curlmultiremovehandledata-multi, data and ignores the return value. When curleasycleanup is invoked from within a write/read/progress/header callback, multi-incallback is TRUE, so curlmultiremovehandle lib/multi.c:818-819 returns CURLMRECURSIVEAPICALL withou...

curl: libcurl upload read callbacks miss recursive API guard, allowing prohibited multi API reentry and ASAN-confirmed UAF

Summary: Several libcurl upload read callback paths invoke the application-provided CURLOPTREADFUNCTION without marking the easy handle as being inside a callback. As a result, recursive multi APIs that are correctly rejected from ordinary callbacks are accepted from these upload read callback...

curl: setopt(VERIFYPEER) from callback bypasses TLS verify on connection reuse

Summary: Curlsslconnconfigupdate overwrites conn-sslconfig.verifypeer when curleasysetoptCURLOPTSSLVERIFYPEER, ... is called, with no handshake-state guard — only ifdata-conn. Since setopt is documented as callable from callbacks setopt.c:2930, an application can connect with verifypeer=0 accepti...

curl: CURLSHOPT_UNSHARE race can cause UAF in shared SSL session cache during HTTPS transfer

Summary CURLSHOPTUNSHARE can free a shared SSL session cache while another thread is starting a normal HTTPS transfer with the same share handle. The failing transfer reaches the cache through curleasyperform, during the OpenSSL handshake. libcurl appears to try to reject this kind of lifetime...

Yelp: Debug Deep Link Abuse Allows Repeated Forced Logout and Application Disruption

A debug deep link was discovered in the Android application "com.yelp.android.biz" that could be triggered externally, causing the application to crash and the user's session to be invalidated, requiring the user to log in again. The existence of this exposed deep link allowed any malicious...

Rocket.Chat: Authentication Bypass via XML Signature Wrapping in SAML SSO

The SAML SSO implementation in Rocket.Chat verified XML signatures but did not bind the validated signature to the samlp:Response or saml:Assertion. As a result, an attacker could submit a wrapped document carrying forged identity attributes alongside a valid signature made by the trusted IdP...

curl: ssh_config_matches is dead code: unauthorized SSH key reuse

Summary libcurl's SSH connection-reuse guard sshconfigmatches — added for CVE-2022-27782 and reaffirmed by CVE-2023-27538 — is dead code in every release since 7.83.1. It compares sshc-rsa / sshc-rsapub between a new transfer "needle" and a pooled connection, but on both sides those pointers are...

curl: mbedTLS / wolfSSL / rustls backends silently skip hostname verification when CURLOPT_SSL_VERIFYPEER=0

Summary When an application sets CURLOPTSSLVERIFYPEER=0 while keeping CURLOPTSSLVERIFYHOST=2 the default, the mbedTLS, wolfSSL, and rustls TLS backends silently skip the hostname-vs-certificate check. The OpenSSL, GnuTLS, and Schannel backends correctly preserve hostname checking under the same...

curl: UAF read in mev_pollset_diff() trace path after curl_easy_pause() in socket callback

Summary: The CVE-2026-9080 fix re-fetches the shentry after the socket callback inside mevshentryupdate, because curleasypause called from that callback re-enters mevassess and can free the entry. The same re-fetch was not applied at the caller, mevpollsetdiff, which dereferences its own entry...