curl: HTTP Request Smuggling and SSRF via CRLF Injection in Curl_add_custom_headers

Summary: A lack of CRLF validation in Curladdcustomheaders at lib/http.c:1761 allows users to inject arbitrary HTTP headers. This violation of RFC 7230 §3.2.4 leads to HTTP Request Smuggling and potential SSRF bypass. AI Disclosure: I utilized an AI assistant to aid in the initial code analysis a...

curl: MQTT Protocol Violation & Integer Overflow in libcurl

Executive Summary Vulnerability Type: CWE-190 Component: lib/mqtt.c Function: mqttdecodelen Affected Architectures: - All architectures: Protocol non-compliance leading to stream desynchronization - 32-bit architectures: Deterministic integer overflow in length decoding libcurl does not correctly...

curl: PROTOCOL-LEVEL: Persistent UDP Amplification and Cache Poisoning via Alt-Svc Logic Flaw

Summary A structural logic flaw in the libcurl Alt-Svc header parser allows attack attributes specifically persist and max-age to "leak" from one service definition to another. We have successfully chained this logic bug with curl's HTTP/3 QUIC support to demonstrate a Persistent UDP Amplificatio...

Nextcloud: Valid share tokens allow to access tempory upload files of share owner

A vulnerability was discovered that allowed access to temporary upload files of a share owner using valid share tokens...

curl: A quiet New Year wish for security researchers

Hi curl Security Team and fellow security researchers, Sorry in advance if this isn’t a traditional security report. I know your time is valuable, and I truly respect the work you all do. I just wanted to take a quiet moment to wish every security researcher here those who report issues, those wh...

Command Injection through bash -c

This report is not public...

Unbounded Classification Output Sorting Leads to Remote Denial-of-Service in Triton Inference Server

This report is not public...

curl: HTTP/2 and HTTP/3 Header Injection in curl

================================================================================ VULNERABILITY REPORT: HTTP/2 and HTTP/3 Header Injection in curl ================================================================================ VULNERABILITY TYPE: Response Header Injection / HTTP Response Splittin...

Unauthenticated File Upload in LollMS

Executive Summary A critical security vulnerability has been identified in LollMS that allows unauthenticated users to upload and process files through the /api/files/extract-text endpoint. This endpoint lacks authentication requirements, contradicting the application's documented "Secure...

Server-Side Request Forgery (SSRF) in LollMS Export Content

Executive Summary A security vulnerability has been identified in LollMS that allows Server-Side Request Forgery SSRF attacks through the /api/files/export-content endpoint. The downloadimagetotemp function downloads images from arbitrary user-controlled URLs without validation, allowing attacker...

Insecure Direct Object Reference (IDOR) in LollMS Friend Request Response

Executive Summary A critical security vulnerability has been identified in LollMS that allows any authenticated user to accept or reject friend requests belonging to other users. The respondrequest function lacks authorization checks, enabling Insecure Direct Object Reference IDOR attacks. Affect...

Content-Type Spoofing in LollMS Image Upload

Executive Summary A security vulnerability has been identified in LollMS that allows authenticated users to bypass file type validation by spoofing the Content-Type header. The /api/upload/chatimage endpoint only validates the HTTP header, not the actual file content, allowing malicious files to ...

curl: SMTP CRLF Injection & Protocol Desynchronization in libcurl

Executive Summary A critical security vulnerability has been identified in libcurl's SMTP protocol handler. The vulnerability allows for SMTP Command Smuggling and Protocol Desynchronization by injecting CRLF sequences into email address fields. This can be exploited to bypass security controls,...

curl: CVE-2025-15224: libssh key passphrase bypass without agent set

A vulnerability was discovered in the libcurl libssh backend where the CURLOPTSSHAUTHTYPES option did not properly implement the CURLSSHAUTHAGENT flag. As a result, if the CURLSSHAUTHPUBLICKEY option was set, the implementation would act as if CURLSSHAUTHAGENT was always defined, allowing...

Node.js: Permission Model Bypass in realpathSync.native Allows File Existence Disclosure

Vulnerability description not provided...

curl: Proxy-Authorization header is leaked to origin server after redirect from proxied to direct connection

Summary curl leaks the Proxy-Authorization header to the origin server after following an HTTP redirect that transitions from a proxied connection to a direct connection e.g. when using --noproxy or when proxy is bypassed after redirect. This causes proxy credentials which are hop-by-hop to be se...

curl: Telnet Suboption Buffer Pointer Underflow in lib/telnet.c leads to Out-of-Bounds Read

Summary A buffer pointer underflow vulnerability exists in curl's telnet protocol handler lib/telnet.c. When processing telnet suboptions in the CURLTSSE state, the code unconditionally decrements the suboption buffer pointer by 2 subpointer -= 2, even when the CURLSBACCUM macro skips writing due...

curl: Cross‑Layer State Confusion in libcurl: Credential & Key‑Material Persistence Across Redirect / Connection Reuse Boundaries

Summary: This report describes a state‑level security invariant violation in libcurl where credential‑ or key‑related state may persist or be re‑applied across logical trust boundaries redirects, connection reuse, or scheme transitions without a formal invariant enforcing reset semantics. The iss...

curl: Heap Buffer Over-read in lib/http2.c (on_header) handling PUSH_PROMISE frames

Summary: I have discovered a Heap Buffer Over-read vulnerability in lib/http2.c within the onheader callback function. When processing HTTP/2 PUSHPROMISE frames, the code incorrectly uses the %s format specifier on raw pointers provided by nghttp2. According to nghttp2 documentation, the name and...

curl: WebSocket Logic Error: Control Frame (PING/PONG) Starvation causes Connection Drop (DoS) during large transfers

Summary: I have discovered a logic flaw in lib/ws.c regarding the handling of WebSocket Control Frames PING/PONG. According to RFC 6455, Control Frames should be processed as soon as possible, even in the middle of fragmented data frames, to maintain connection state Keep-Alive. However, libcurl...