curl: One Strict-Transport-Security response header empties the victim's entire HSTS store, silently,

Summary One Strict-Transport-Security response header, from any HTTPS server the victim contacts, leaves the victim's on-disk HSTS store at zero bytes. Every host in it loses HSTS protection, including hosts unrelated to the server that sent the header. curl exits 0 and prints nothing. Two...

Node.js: TLS certificate hostname bypass when the host loosely resolves to an IP address

A flaw was discovered in TLS hostname verification that could allow a server certificate to be validated against a different IP address than the one the client connected to. This occurred when a host used a non-canonical IPv4 literal with a leading zero, as the certificate validation normalizatio...

HackerOne: HackerOne Code sends live password-reset tokens to Segment in automatic page events

A vulnerability was discovered in the HackerOne Code application, where opening a password-reset link automatically sent the complete unused 64-character reset token to Segment as the page loaded, before the reset form was submitted. The token was present in various fields of the Segment page...

Mozilla: A disabled account's API key still works on BMO's Mojolicious /rest/ routes, including for security-group bugs filed after the disable

A Bugzilla instance had inconsistent authentication validation across its API implementations. The newer REST routes failed to verify account status when processing API keys, while the legacy REST API and web interface correctly rejected disabled accounts. This allowed disabled accounts' API keys...

Node.js: Permission Model filesystem over-grant via wildcard radix lookup

A flaw was discovered in Node.js Permission Model filesystem enforcement that allowed access to be granted to paths not matching wildcard read or write rules. When a requested path was shorter than the prefix of a wildcard grant, the radix tree lookup would stop comparing early and incorrectly...

R3: Full Admin Takeover of R3 Limited's JFrog Artifactory - 292 Users, Corda Enterprise & CBDC Supply Chain Compromised

A critical authentication bypass vulnerability was identified in an enterprise artifact repository system. The vulnerability, with a CVSS score of 9.8, resulted from a default empty join key that allowed unauthenticated attackers to forge authentication tokens and gain full administrative access...

Ruby on Rails: Action Text to_markdown: <code>/<pre> content escapes its delimiter, letting a stored body inject arbitrary Markdown

Summary ActionText::Contenttomarkdown escapes text nodes so that a stored rich text body cannot turn into Markdown syntax. Text whose immediate parent is or is exempt from that escaping MarkdownConversion::SKIPESCAPINGPARENTS and is instead kept inert by the delimiter its visitor wraps around it...

curl: HTTP Digest nonce reused across an https→http scheme change on the same handle

Hi all, Last one from my side. Looks like https://hackerone.com/reports/3793260 was not patched completely correctly, and libcurl emit a live Authorization: Digest response computed from a nonce/realm it only ever received over TLS preemptively over plaintext HTTP, on a reused easy handle that...

curl: CVE-2026-86415: auto client cert connection reuse mixup

Howdy, libcurl's connection-cache matcher never checks autoclientcert, so a cached, already-authenticated Schannel connection can be handed to a transfer that just got redirected to a different origin, even though the code explicitly computed autoclientcert = FALSE for that transfer to prevent...

curl: Apple SecTrust fallback ignores CURLOPT_CRLFILE, letting a revoked cert pass

When libcurl is built with USEAPPLESECTRUST and the native Apple trust store is in use, a certificate that OpenSSL/GnuTLS rejects because it is on the operator's CURLOPTCRLFILE list is re-checked by Apple's SecTrust API instead, and SecTrust is never told about that CRL file at all. The bug...

curl: CVE-2026-86414: leaking host credentials to HTTP proxy

Hi all, I've found that found that an untrusted HTTP proxy can trick libcurl into sending the origin's credentials Basic password, or a Negotiate/Kerberos ticket to the proxy itself, by answering the CONNECT tunnel request with 401 WWW-Authenticate instead of the expected 407 Proxy-Authenticate...

curl: CVE-2026-86413: Negotiate credentials sent to redirected origin

Hi all, I found a way to make libcurl send a live SPNEGO/Kerberos Authorization: Negotiate token to a host the client never intended to authenticate to, bypassing the cross-host auth restriction, when following a redirect whose Location: header embeds userinfo http://user:[email protected]/.... The...

curl: CVE-2026-87866: wolfSSL public-key pinning bypass

Summary curl 8.22.0 built with wolfSSL can accept a CURLOPTPINNEDPUBLICKEY hash for a key the TLS peer does not possess. wolfSSL completes the TLS handshake using public key A from a malformed certificate. curl then reparses the same DER using CurlparseX509 and, because of a manipulated validity...

Mozilla: Stored XSS on the public Pontoon dashboards: the latest-activity tooltip re-parses a contributor's account address as HTML

A stored cross-site scripting vulnerability was discovered in public dashboards where contributor-supplied data values were concatenated into markup without proper encoding. An attacker could register an account with a malicious script in the email address field, which would then execute in the...

Khan Academy: Client-Side Denial of Service (DoS) via Memory Exhaustion on Password Reset Endpoint

A client-side denial of service vulnerability was identified on a password reset endpoint. When the endpoint was accessed by an authenticated user, the browser automatically generated thousands of requests without user interaction, resulting in rapid memory exhaustion. The browser became...

curl: Cross-origin redirect reuses a pooled Negotiate-authenticated connection from an unrelated transfer

AI Disclosure: AI tools were used to assist with code analysis and drafting this report. All findings were independently investigated, verified against the source, and reproduced manually by me before submission. Summary curl withholds a fresh Authorization header when a redirect crosses origins...

curl: IMAP connection reuse runs requests in the wrong case-sensitive mailbox

When libcurl reuses an authenticated IMAP connection, lib/imap.c:2071-2089 uses curlstrequal to decide whether the requested mailbox is already selected. RFC 9051 section 5.1 requires clients to work with servers where non-INBOX mailbox names are case-sensitive, while only INBOX is guaranteed to ...

curl: CVE-2026-87865: knownhost callback mismatches key as missing

When libcurl uses libssh2 with a hashed OpenSSH knownhosts file, an unrelated first entry can make a hostile key for an already pinned SFTP/SCP host reach CURLOPTSSHKEYFUNCTION as CURLKHMATCHMISSING instead of CURLKHMATCHMISMATCH. At...

curl: 56: IBM i CL wrapper `parse_command_line()` never enters quote mode

Summary In projects/OS400/curlcl.c, the parsecommandline function initializes quote to '\0' but no code path ever assigns an opening ' or " to it. The close-quote check line 82, quote-aware backslash handling line 88, and unterminated-quote error line 106 are all dead code. As a result, quote...

curl: 55: Heap-buffer-overflow read in `curl_formadd_ccsid()` with binary form data

Summary curlformaddccsid in projects/OS400/ccsidcurl.c performs a heap-buffer-overflow read when CURLFORMCONTENTTYPE appears before an explicit length CURLFORMCONTENTLEN / CURLFORMCONTENTSLENGTH for binary CURLFORMCOPYCONTENTS data containing embedded NUL bytes. The overread bytes are copied into...