curl: Explicit NO_PROXY /0 CIDR rules fail to bypass HTTP proxy for IP-literal requests

Summary: With an HTTP proxy configured, I found that curl sends IPv4 address-literal requests through it with NOPROXY=0.0.0.0/0, and IPv6 address-literal requests through it with NOPROXY=::/0. A zero-bit CIDR prefix should match every address in its family, so those requests should bypass the...

curl: libcurl RTSP `CURLOPT_CRLF` conversion allows a request body to become a second RTSP request

AI WAS USED IN THE PROCESS OF IDENTIFYING THIS VULNERABILITY. The vulnerability was tested manually and the report was carefully read. Suggested severity Low Affected version curl 8.23.0, tag curl-8230, commit 3163ec065643ba20709f190111f42c3e1fe95273. Affected interface The issue is reachable...

curl: TFTP accepts a first response from an IP other than the requested server

Summary: When curl sends a TFTP request to the IP in the URL, it accepts the first valid response from any source IP and pins that sender as the transfer peer. A host that can get UDP packets to the client's ephemeral port and win this first-response race can receive bytes from a TFTP upload or...

curl: CVE-2026-107929: local interface connection reuse mixup

Summary: When CURLOPTINTERFACE is set with one of the documented prefixes if!, host!, ifhost!, that binding is not part of the connection reuse key, so a later transfer asking for a different source can silently reuse an existing connection and go out from the earlier transfer's source address...

curl: CVE-2026-107928: info leak uploading over WebSockets with GnuTLS

Summary: When curl is built with GnuTLS, a malicious WebSocket server can make curl -T wss://... send memory past curl's WebSocket send buffer. This is due to an out of bounds read in gtlssend, which doesn't handle if gnutlsrecordsend returns a number of bytes sent greater than the number of byte...

curl: HTTP/1.1 connection reuse returns unsolicited server data as the next request's response (regression in 8.22.0)

Since 8.22.0 libcurl reuses an idle HTTP/1.1 connection that already has unread bytes waiting on it, as long as the pool health check ran less than a second ago, and those bytes are then returned as the response to the next request sent on that connection, so every later response on it is shifted...

curl: Cookie attribute truncation in curl drops Secure/HttpOnly protections

Description: If a Set-Cookie header contains an = immediately after a semicolon i.e., ;=, curl stops parsing the attributes and discards everything that follows. This silently drops protections like Secure and HttpOnly, causing curl to later send the cookie over unencrypted HTTP. Root Cause: In...

curl: Rustls backend discloses out-of-bounds heap data during legal IMAP upload cancellation

Affected: Rustls-backed libcurl, curl 8.8.0 through 8.22.0 and current 8.23 development Summary A malicious IMAP server can apply TLS socket backpressure during an APPEND upload. If the application then legally removes the active easy handle from its multi handle, curl's IMAP cleanup sends a...

Ruby on Rails: ActionText `to_markdown` still allows `javascript:` links in kramdown via Rails-generated table cells after PR #58754

Vulnerability description not provided...

curl: libcurl: Secure=1 cookie flag bypasses the 8.22.0 fix and leaks over HTTP

Summary: An HTTPS server can send Set-Cookie: session=lab; Secure=1; Path=/, and curl stores it without the Secure flag, so a later HTTP request to the same host sends session=lab in cleartext. I reproduced this with 8.22.0 and master bb348b35 8.23.0-DEV; the ordinary Secure attribute stays...

HackerOne: HackerOne Code: a live password reset token reaches Datadog RUM, and the same session records the account it unlocks

A password reset token was transmitted to a real user monitoring service before the reset form was submitted. The token was passed as a query string parameter in the URL and recorded by the monitoring SDK without any redaction. The same monitoring session also captured the account identifier afte...

Essity: Unauthenticated self-registration on ████████ grants full access to internal supplier procurement portal and vendor data

An unauthenticated self-registration endpoint was discovered on an internal supplier procurement portal. The registration form was fully functional and accessible without any invitation, approval code, or affiliation verification. A test account was successfully created and confirmed via email...

curl: Use-after-free read of the freed referer buffer in `curl_easy_setopt(CURLOPT_REFERER)` — stale heap bytes transmitted in an outbound `Referer:` heade

CWE-416 → CWE-908/CWE-200 Aset yang terdampak Affected Asset - Component: libcurl — lib/setopt.c, CURLOPTREFERER handler curleasysetopt API - Related code paths: lib/bufref.c Curlbufreffree, CURLINFOREFERER getter lib/getinfo.c:145, referer emission lib/http.c:2941-2945, pretransfer sync...

curl: curl tool: --hsts is ignored for a schemeless URL starting with a slash under --proto-default http

Summary When the curl tool gets --proto-default http and a URL without a scheme that starts with a slash, such as /example.com/path, it skips all the options set in httpsetopts: --hsts, --alt-svc, the cookie options, -L and the rest. libcurl still performs the transfer, over plain HTTP. Unless an...

curl: IMAP literal size truncation on 32-bit platforms corrupts downloads and desynchronizes the response parser

Summary On 32-bit builds of libcurl, the IMAP FETCH handler truncates a server-announced literal size size from curlofft 64-bit to sizet 32-bit when it decides how many already-buffered bytes belong to the literal body. When a malicious or malfunctioning IMAP server announces a literal whose size...

curl: [HIGH] CWE-22 — Path Traversal in FTP Wildcard Download via Unencoded `.` in Escaped Filenames

Summary A malicious or MITM'd FTP server can cause a client using CURLOPTWILDCARDMATCH to download files outside the intended remote directory, by returning a LIST response with a filename containing .. path-traversal sequences. Details In the CURLWCDOWNLOADING state lib/ftp.c:4079-4095, each...

WordPress: Information Disclosure - Unauthen Leak Private Content

A vulnerability was discovered in the BuddyPress integration of a forum plugin where the hidesitewide flag for new topic and reply activity was computed by checking only the posting forum's own status, not its parent forums. This allowed topics posted in a public-status subforum nested under a...

curl: Missing applicability validation allows non-applicable HTTPS RR to reach ECH processing

Summary The HTTPS RR applicability check Curlhttpsrrapplicable is applied before ALPN selection, but the same check is not applied consistently in the ECH initialization paths. When an HTTPS RR is not applicable to the active connection, curl correctly reports it as not applicable and avoids usin...

curl: CVE-2026-94266: password leak in CURLINFO_EFFECTIVE_URL

A .netrc-sourced password, injected into the live URL handle at login time, survives an ordinary same-host relative Location: redirect and ends up verbatim in data-state.url, so it is exposed via CURLINFOEFFECTIVEURL, curl -w '%urleffective', and verbose -v output. Affected code...

curl: Windows filename sanitizer misses Unicode COM/LPT reserved device names

Hi all, I found a way for a server-selected Windows filename to bypass curl's reserved DOS device-name sanitizer. With curl -O -J, a Content-Disposition filename such as COM¹, COM², COM³, LPT¹, LPT², or LPT³ is left unchanged, even though Windows treats all six as reserved device names. Curl...