NEWS (17827B)
1 Thu Apr 2 12:16:28 AM CEST 2026 2 Released GNU libmicrohttpd 1.0.3. 3 4 This is a bugfix release. 5 It primarily fixes a list traversal issue that could 6 cause connection handling issues when other connections 7 were suspended. 8 9 -- Christian Grothoff 10 11 Mon Jul 14 2025 05:03:07 PM CEST 12 Released GNU libmicrohttpd 1.0.2. 13 14 This is a bugfix release. 15 It primarily fixes a double-close() bug on bind() errors. 16 17 -- Christian Grothoff 18 19 Fri 23 Feb 2024 21:00:00 UZT 20 Released GNU libmicrohttpd 1.0.1. 21 22 This is a correction release. 23 This release mainly fixes and improves builds with non-default configure 24 parameters. 25 26 -- Evgeny Grin (Karlson2k) 27 28 Thu 01 Feb 2024 15:00:00 CET 29 Released GNU libmicrohttpd 1.0.0. 30 31 This is the first non-bugfix release since version 0.9.75 and the first 32 ever stable release of GNU libmicrohttpd. It is a huge one with new 33 features and fixes. 34 35 The major changes: 36 * Rewritten parsing of clients' requests, fully aligned with current 37 RFCs (9110 and 9112) requirements. Added detailed control of strict 38 or lenient specification enforcement. Application may choose between 39 more compatible mode or more strict and secure mode. 40 * Reworked Digest Auth, greater enhanced support for current RFC 7617 41 features. MHD currently is the only known server-side implementation 42 with support for SHA-512/256, userhash and username in extended 43 notation. At the same time the very old RFC2069 is supported, as 44 well as MD5 and SHA-256. 45 * Improved functionality in multi-threading environment, especially with 46 external sockets polling modes. 47 * Reworked Basic Auth, adding new convenient API functions. 48 * Re-implemented GnuTLS initialisation. Now supported 49 libmicrohttpd-specific system-wide configuration, as well as generic 50 GnuTLS system-wide configuration. Application may adjust settings based 51 on system configuration instead of specifying its own full 52 configuration. 53 * Tons of other new functionality and various fixes. For detailed changes 54 see the ChangeLog or Git commit logs. 55 56 57 Since last non-bugfix release there are 1062 commits added with 58 67007 lines insertions and 26616 deletions. 59 60 -- Evgeny Grin (Karlson2k) 61 62 Sun 28 May 2023 18:00:00 MSK 63 Released GNU libmicrohttpd 0.9.77. 64 65 This is mostly a bugfix release. 66 This version created by taking patches from the current development 67 branch and back-porting them on top of version 0.9.76. 68 The most notable changes are: some improvements for Digest and Basic 69 authorizations, fixed efficiency for TLS upgraded connections, fixed 70 processing of folded headers in requests, fixed functionality with 71 blocking sockets, improved and fixed internal test-suite. 72 73 The more detailed list of the important changes: 74 75 API changes: 76 + Added new function MHD_get_version_bin(). 77 78 Improvements and enhancements: 79 * Digest Auth: changed algorithm identifiers in server generated 80 headers from "md5" / "sha-256" to "MD5" / "SHA-256" to better match 81 RFC (while clients should use caseless matching). 82 * Improved Base64 decoding by new implementation with robust input 83 data validation checks. 84 * Improved configure for cross-compiling, for better compatibility 85 with POSIX and for better compatibility with the latest compiler 86 versions. 87 * New internal tests: for Base64 decoding, Basic Auth and folded 88 headers. 89 * Supported new libcurl API in tests to mute deprecation warnings. 90 * Supported ARM and ARM64 for VC compilers. 91 92 Functionality changes: 93 * any negative number returned by response data generation callback 94 function is treated as an error. Previously negative values except 95 predefined error codes could produce undefined behaviour. 96 * Added handling of "DEBUG" preprocessor macro as an alias of "_DEBUG". 97 98 Fixes: 99 # Fixed functionality with blocking sockets. 100 # Fixed very inefficient data pumping for upgraded TLS connections. 101 # Fixed processing of folded headers in the requests. 102 # Fixed data races when closing upgraded connection. 103 # Removed duplication of "Connection: upgrade" header. 104 # Digest auth: fixed thread sync to avoid "stale hash" results. 105 # Fixed harmless unwanted extra data processing resulting in triggering 106 of the assert. 107 # Fixed tests for LTO. 108 # Removed removed non-portable functions in examples. 109 # Fixed delayed call of connection notification callback in 110 thread-per-connection mode. 111 # Fixed Address Sanitizer unpoison of memory when memory pool is 112 destroyed. This fixed periodic ASAN error when used for a long time 113 with the sanitizer. 114 # Fixed compiler warnings in library code, examples, tests and configure 115 checks. 116 # New TLS certificates for test-suite: all with SAN fields and SHA-256 117 hash. 118 # Tests: fixed tests on Darwin 22.x (Ventura). 119 # Tests: redesigned one tests group to avoid stress-testing of the OS. 120 121 -- Evgeny Grin (Karlson2k) 122 123 Sun 26 Feb 2023 17:49:30 CET 124 Released GNU libmicrohttpd 0.9.76 hotfix. -CG 125 126 This is a hotfix release. 127 This only change since previous release is fixed potential DoS vector 128 in MHD_PostProcessor discovered by Gynvael Coldwind and Dejan 129 Alvadzijevic (CVE-2023-27371). 130 While the researchers have not been able to exploit this attack vector 131 when libmicrohttpd is compiled with the standard GNU C library, it is 132 recommended that you update MHD as soon as possible if your 133 applications are using (optional) MHD_PostProcessor functionality. 134 135 -- Evgeny Grin (Karlson2k) 136 137 Sun 26 Dec 2021 20:30:00 MSK 138 Released GNU libmicrohttpd 0.9.75 -EG 139 140 This is a correction release. 141 The main improvement is the implementation of workaround for some 142 OSes (like OpenBSD 7) where "monotonic" clock may jump back. Now 143 MHD is able to automatically detect such situation and recover if 144 the jump is small. This workaround is needed with increased 145 accuracy of connection timeout introduced in previous version, as 146 with lower accuracy (v0.9.73 and before) these jumpbacks were 147 unnoticeable. 148 Other changes: fixed some compiler, Makefile, and configure 149 warnings on specific platforms; one test further improved. 150 151 -- Evgeny Grin (Karlson2k) 152 153 154 Sun 19 Dec 2021 18:30:00 MSK 155 Released GNU libmicrohttpd 0.9.74 156 157 This release brings a lot of fixes and improvements, and 158 important new features. 159 The most significant addition is the new experimental 160 implementation of WebSockets contributed by David Gausmann. This 161 implementation is not fully tested yet so currently it is disabled 162 by default. 163 Other changes include a lot of improvements and clarifications 164 in doxy comments in microhttpd.h header file, improved compliance 165 with the RFC HTTP specifications, the new implementation of reply 166 header forming, the new implementation of request chunked encoding 167 parsing, new automatic error replies, internal optimisations, and 168 many important fixes, including fixes for long-standing bugs. 169 170 More detailed list of notable changes: 171 172 API changes: 173 + Added new function MHD_get_reason_phrase_len_for(). 174 + Added MHD_CONNECTION_INFO_HTTP_STATUS type of information 175 queried by MHD_get_connection_info(). 176 + Added new response flag MHD_RF_SEND_KEEP_ALIVE_HEADER to force 177 sending of "keep-alive" header even if not required by RFC. 178 + Added new response creation function 179 MHD_create_response_from_buffer_with_free_callback_cls() with 180 custom cleanup callback. 181 + Added new response flag MHD_RF_HTTP_1_0_COMPATIBLE_STRICT with 182 the same functionality as existing MHD_RF_HTTP_VERSION_1_0_ONLY 183 flag. The old flag will be deprecated. 184 + Added new response flag MHD_RF_HTTP_1_0_SERVER with the same 185 functionality as existing MHD_RF_HTTP_VERSION_1_0_RESPONSE flag. 186 The old flag will be deprecated. 187 188 New features: 189 + Added experimental WebSockets extension with separate header. 190 Disabled by default as it is not fully tested yet. 191 + Added '--enable-sanitizers[=address,undefined,leak,user-poison]' 192 configure parameter (instead of '--enable-sanitizer'), 193 implemented custom memory poisoning for memory pools. 194 195 Improvements and enhancements: 196 * Doxy function descriptions was corrected, clarified, extended, 197 and improved. Now it should be much easier to learn MHD just by 198 reading the headers. 199 * Completely rewritten reply header forming. New implementation is 200 more robust, simpler maintainable and expandable, and better 201 follows RFC HTTP specifications. 202 * Performance improvements: now HTTP version and request method are 203 decoded one time only (previously MHD used string comparison many 204 times during processing the data). 205 * Rewritten request chunked payload decoding. The new 206 implementation better conforms to the HTTP RFC, detects format 207 problems earlier, replies to the clients with description of 208 detected problems, handles untypical (but syntactically correct) 209 values properly. 210 * Added special replies for wrong/unsupported HTTP versions in 211 requests, broken HTTP chunked encoding in requests, 212 * As required by HTTP RFC, added automatic error replies if client 213 used broken chunked encoding, too large chunk size, too large 214 payload size, or broken Content-Length header. 215 * Optimized connection's memory pool handling. 216 * Changed timeout precision from one second to one millisecond. 217 * Added some checks for incorrect user data, reporting problems in 218 MHD log. 219 * Improved performance of hash calculations functions by using 220 compiler built-ins (if available). 221 * Implemented SHA-1 calculations (required for WebSockets). 222 * Added universal MSVC project that works with any (sufficiently 223 new) version of MSVC. 224 * Developed simple HTTP client to test MHD under very special 225 conditions. 226 * Implemented 45 new tests. 227 * Improved existing tests to test more aspects of MHD. 228 * Added check for correct results of system and libcurl functions. 229 * Response headers are checked during forming of responses. 230 * HTTPS tests were improved. 231 * Added rebuild on W32 of all required files if files are missing. 232 * Many internal optimisations and improvements. 233 234 Functionality changes: 235 * Keep-alive header is omitted by default for HTTP/1.1 connections. 236 Use of header can be enforced by response flag. 237 * Chunked encoding is used for HTTP/1.1 non-keep-alive connections 238 for responses with unknown size. Previously MHD used "indication 239 of the end of the response by closing connection" in such cases, 240 however it is not correct for HTTP/1.1 connections as per HTTP 241 RFC. 242 * As required by HTTP RFC, use HTTP/1.1 version instead of HTTP/1.0 243 in reply headers when client is HTTP/1.0 . HTTP/1.0 version can 244 be enforced by response flag. 245 * User response headers are used in replies in the same order as 246 was added by application. 247 * Allowed tab characters in response header values. 248 * All custom "Connection:" response headers are automatically 249 combined into single "Connection:" header. 250 * "keep-alive" token silently dropped from custom "Connection:" 251 response header. "Keep-alive" cannot be enforced and used 252 automatically if possible. 253 * Allow tab character in custom response header value. 254 * Disallow space character in custom response header value. 255 * Do not allow responses with 1xx codes for HTTP/1.0 requests. 256 * Detected and reported incorrect "Upgrade" responses. 257 * W32 targets are changed to Vista+ by default. XP is supported 258 still. 259 260 Fixes: 261 # Fixed short busy-waiting (up to one second) when connection is 262 going to be expired and closed. 263 # Fixed handling of errors during start of new connection, fixed 264 inability to accept new connections in thread-per-connection mode 265 due to the missing decrement of number of daemon's connections if 266 start of new thread is failed. 267 # Fixed incorrect parsing of LFLF, LFCR, CRCR, and bare CR as 268 single linefeed in request header and request chunked payload. 269 Now only CRLF or bare LF are recognized as linefeed. 270 # Fixed response chunked encoding handling. Now it works properly 271 with non-keep-alive connection, with fixed size replies (if 272 chunked was enforced by header), and in other situations. 273 # Other fixes for chunked replies. 274 # Fixed handling of custom connection timeout in thread-per- 275 connection mode. 276 # Fixed wrongly used MHD_REQUEST_TERMINATED_COMPLETED_OK code for 277 application notification when MHD_REQUEST_TERMINATED_WITH_ERROR 278 code must be used. 279 # Fixed code MHD_REQUEST_TERMINATED_READ_ERROR not reported (code 280 MHD_REQUEST_TERMINATED_WITH_ERROR was incorrectly used instead). 281 # Fixed handling of request chunked encoding with untypical 282 formatting. 283 # Fixed processing of last part of hex-encoded values under 284 certain conditions. 285 # Fixed value returned for MHD_CONNECTION_INFO_REQUEST_HEADER_SIZE. 286 # Fixed returned value for MHD_FEATURE_AUTOSUPPRESS_SIGPIPE on W32, 287 now it is MHD_YES as W32 does not need SIGPIPE suppression. 288 # Fixed portability of bitwise NOT for enums values. 289 # Fixed SHA-256 and MD5 calculations with unaligned data. 290 # Fixed incorrect caseless matching for HTTP version. 291 # Fixed incorrect caseless matching for request method. 292 # Fixed compatibility with old GnuTLS versions. 293 # Fixed compiler warnings on 32-bits platforms. 294 # Fixed blocking sockets setting in tests and examples for W32. 295 # Fixed examples to really use libmagic if present. 296 # HTTPS tests were fixed. 297 # Fixed libcurl test with case-insensitive match for HTTP methods, 298 method names must use case-sensitive match. 299 # Fixed tests compatibility with old libcurl versions. 300 # Fixed build on W32 with llvm-dlltool (this tool is too 301 oversimplified) 302 303 -- Evgeny Grin (Karlson2k) 304 305 306 Sun 25 Apr 2021 14:00:00 MSK 307 Released GNU libmicrohttpd 0.9.73 308 309 This release brings new features, improvements, and a few fixes. 310 The most important addition is the new function for vector-backed 311 responses, based on the patch contributed by NASA engineers. 312 Other changes include compatibility with autoconf 2.70+, improved 313 testsuite compatibility with CI systems, fixed and improved MSVC 314 builds, and implementation of ALPN support. 315 316 More detailed list of notable changes: 317 318 API changes: 319 + Added new function MHD_create_response_from_iovec(), based on the 320 patch provided by Lawrence Sebald and Damon N. Earp from NASA. 321 + Added MHD_OPTION_SIGPIPE_HANDLED_BY_APP daemon option. 322 + Added new function MHD_run_wait(). 323 + Added MHD_OPTION_TLS_NO_ALPN to disable usage of ALPN even if 324 it is supported by TLS library. 325 326 New features: 327 + Added '--enable-heavy-tests' configure parameter (disabled by 328 default). 329 + Implemented support for ALPN. 330 331 Improvements and enhancements: 332 * Return timeout of zero also for connections awaiting cleanup. 333 * Compatibility with autoconf >=2.70, used new autoconf features. 334 * Warn user when custom logger option is not the first option. 335 * Added information to the header about minimal MHD version when 336 particular symbols were introduced. 337 * Updated test certificates to be compatible with modern browsers. 338 * Added on-fly detection of UNIX domain sockets and pipes, MHD does 339 not try to use TCP/IP-specific socket options on them. 340 * Report more detailed error description in the MHD log for send 341 and receive errors. 342 * Enabled bind port autodetection for MSVC builds. 343 344 Fixes: 345 # Fix PostProcessor to always properly stop iteration when 346 application callback tells it to do so. 347 # Fixed MD5 digest authorization broken when compiled without 348 variable length arrays support (notably with MSVC). 349 # Fixed detection of type of send errors on W32. 350 351 -- Evgeny Grin (Karlson2k) 352 353 354 Mon 28 Dec 2020 21:36:00 MSK 355 Released GNU libmicrohttpd 0.9.72 356 357 This release is mostly a bugfix release, with greatly improved 358 compatibility with various OSes/kernels, including FreeBSD, Windows, 359 OpenBSD, NetBSD, Darwin (macOS), Solaris. Performance is improved, 360 especially with HTTPS connections and stay-alive HTTP connections. 361 362 Notable changes since version 0.9.71: 363 364 API changes: 365 + New function MHD_create_response_from_pipe() 366 367 Improvements and enhancements: 368 * Fully rewritten code for buffering/pushing from kernel network buffers 369 for compatibility with various OSes. Reduced number of additional 370 sys-calls, network is better utilized, responses are delivered faster. 371 * Restored optimal sendfile() usage on FreeBSD. 372 * MHD now takes care about SIGPIPE handling by blocking it in internal 373 threads and avoiding functions (like sendfile()) that could generate 374 SIGPIPE when blocking of this signal is not possible. 375 376 Fixes: 377 # Fixed crash in PostProcessor. 378 # Fixed several resources leaks in corner cases. 379 # Improved thread sync, thread safety and fixed one use-after-free under 380 special conditions during stopping of daemon. 381 # Updated HTTP status codes, header names and methods from the 382 registries. 383 # Fixed functioning without listen socket and with internal threads. 384 # Fixed streaming of chunked responses for both HTTP and HTTPS. 385 # Various compatibility fixes. 386 387 -- Evgeny Grin (Karlson2k) 388 389 390 Tue Jan 9 20:52:48 MST 2007 391 Project posted.