NEWS (18628B)
1 Mon Jul 27 06:13:26 PM CEST 2026 2 Released GNU libmicrohttpd 1.0.7. 3 4 This is a bugfix release, fixing modest security vulnerabilities 5 discovered by A. Ramos. 6 7 -- Christian Grothoff 8 9 Wed Jul 8 12:47:35 PM CEST 2026 10 Released GNU libmicrohttpd 1.0.6. 11 12 This is a bugfix release, fixing minor bugs mostly in error handling, 13 theoretical integer overflows, and rare memory leaks. 14 15 -- Christian Grothoff 16 17 Thu Apr 16 10:36:54 AM CEST 2026 18 Released GNU libmicrohttpd 1.0.5. 19 20 This is a bugfix release. 21 It fixes a additional HTTP request smuggling issues (CWE-444). 22 23 -- Christian Grothoff 24 25 Mon Apr 13 11:42:06 AM CEST 2026 26 Released GNU libmicrohttpd 1.0.4. 27 28 This is a bugfix release. 29 It fixes a minor HTTP request smuggling issue (CWE-444). 30 31 -- Christian Grothoff 32 33 Thu Apr 2 12:16:28 AM CEST 2026 34 Released GNU libmicrohttpd 1.0.3. 35 36 This is a bugfix release. 37 It primarily fixes a list traversal issue that could 38 cause connection handling issues when other connections 39 were suspended. 40 41 -- Christian Grothoff 42 43 Mon Jul 14 2025 05:03:07 PM CEST 44 Released GNU libmicrohttpd 1.0.2. 45 46 This is a bugfix release. 47 It primarily fixes a double-close() bug on bind() errors. 48 49 -- Christian Grothoff 50 51 Fri 23 Feb 2024 21:00:00 UZT 52 Released GNU libmicrohttpd 1.0.1. 53 54 This is a correction release. 55 This release mainly fixes and improves builds with non-default configure 56 parameters. 57 58 -- Evgeny Grin (Karlson2k) 59 60 Thu 01 Feb 2024 15:00:00 CET 61 Released GNU libmicrohttpd 1.0.0. 62 63 This is the first non-bugfix release since version 0.9.75 and the first 64 ever stable release of GNU libmicrohttpd. It is a huge one with new 65 features and fixes. 66 67 The major changes: 68 * Rewritten parsing of clients' requests, fully aligned with current 69 RFCs (9110 and 9112) requirements. Added detailed control of strict 70 or lenient specification enforcement. Application may choose between 71 more compatible mode or more strict and secure mode. 72 * Reworked Digest Auth, greater enhanced support for current RFC 7617 73 features. MHD currently is the only known server-side implementation 74 with support for SHA-512/256, userhash and username in extended 75 notation. At the same time the very old RFC2069 is supported, as 76 well as MD5 and SHA-256. 77 * Improved functionality in multi-threading environment, especially with 78 external sockets polling modes. 79 * Reworked Basic Auth, adding new convenient API functions. 80 * Re-implemented GnuTLS initialisation. Now supported 81 libmicrohttpd-specific system-wide configuration, as well as generic 82 GnuTLS system-wide configuration. Application may adjust settings based 83 on system configuration instead of specifying its own full 84 configuration. 85 * Tons of other new functionality and various fixes. For detailed changes 86 see the ChangeLog or Git commit logs. 87 88 89 Since last non-bugfix release there are 1062 commits added with 90 67007 lines insertions and 26616 deletions. 91 92 -- Evgeny Grin (Karlson2k) 93 94 Sun 28 May 2023 18:00:00 MSK 95 Released GNU libmicrohttpd 0.9.77. 96 97 This is mostly a bugfix release. 98 This version created by taking patches from the current development 99 branch and back-porting them on top of version 0.9.76. 100 The most notable changes are: some improvements for Digest and Basic 101 authorizations, fixed efficiency for TLS upgraded connections, fixed 102 processing of folded headers in requests, fixed functionality with 103 blocking sockets, improved and fixed internal test-suite. 104 105 The more detailed list of the important changes: 106 107 API changes: 108 + Added new function MHD_get_version_bin(). 109 110 Improvements and enhancements: 111 * Digest Auth: changed algorithm identifiers in server generated 112 headers from "md5" / "sha-256" to "MD5" / "SHA-256" to better match 113 RFC (while clients should use caseless matching). 114 * Improved Base64 decoding by new implementation with robust input 115 data validation checks. 116 * Improved configure for cross-compiling, for better compatibility 117 with POSIX and for better compatibility with the latest compiler 118 versions. 119 * New internal tests: for Base64 decoding, Basic Auth and folded 120 headers. 121 * Supported new libcurl API in tests to mute deprecation warnings. 122 * Supported ARM and ARM64 for VC compilers. 123 124 Functionality changes: 125 * any negative number returned by response data generation callback 126 function is treated as an error. Previously negative values except 127 predefined error codes could produce undefined behaviour. 128 * Added handling of "DEBUG" preprocessor macro as an alias of "_DEBUG". 129 130 Fixes: 131 # Fixed functionality with blocking sockets. 132 # Fixed very inefficient data pumping for upgraded TLS connections. 133 # Fixed processing of folded headers in the requests. 134 # Fixed data races when closing upgraded connection. 135 # Removed duplication of "Connection: upgrade" header. 136 # Digest auth: fixed thread sync to avoid "stale hash" results. 137 # Fixed harmless unwanted extra data processing resulting in triggering 138 of the assert. 139 # Fixed tests for LTO. 140 # Removed removed non-portable functions in examples. 141 # Fixed delayed call of connection notification callback in 142 thread-per-connection mode. 143 # Fixed Address Sanitizer unpoison of memory when memory pool is 144 destroyed. This fixed periodic ASAN error when used for a long time 145 with the sanitizer. 146 # Fixed compiler warnings in library code, examples, tests and configure 147 checks. 148 # New TLS certificates for test-suite: all with SAN fields and SHA-256 149 hash. 150 # Tests: fixed tests on Darwin 22.x (Ventura). 151 # Tests: redesigned one tests group to avoid stress-testing of the OS. 152 153 -- Evgeny Grin (Karlson2k) 154 155 Sun 26 Feb 2023 17:49:30 CET 156 Released GNU libmicrohttpd 0.9.76 hotfix. -CG 157 158 This is a hotfix release. 159 This only change since previous release is fixed potential DoS vector 160 in MHD_PostProcessor discovered by Gynvael Coldwind and Dejan 161 Alvadzijevic (CVE-2023-27371). 162 While the researchers have not been able to exploit this attack vector 163 when libmicrohttpd is compiled with the standard GNU C library, it is 164 recommended that you update MHD as soon as possible if your 165 applications are using (optional) MHD_PostProcessor functionality. 166 167 -- Evgeny Grin (Karlson2k) 168 169 Sun 26 Dec 2021 20:30:00 MSK 170 Released GNU libmicrohttpd 0.9.75 -EG 171 172 This is a correction release. 173 The main improvement is the implementation of workaround for some 174 OSes (like OpenBSD 7) where "monotonic" clock may jump back. Now 175 MHD is able to automatically detect such situation and recover if 176 the jump is small. This workaround is needed with increased 177 accuracy of connection timeout introduced in previous version, as 178 with lower accuracy (v0.9.73 and before) these jumpbacks were 179 unnoticeable. 180 Other changes: fixed some compiler, Makefile, and configure 181 warnings on specific platforms; one test further improved. 182 183 -- Evgeny Grin (Karlson2k) 184 185 186 Sun 19 Dec 2021 18:30:00 MSK 187 Released GNU libmicrohttpd 0.9.74 188 189 This release brings a lot of fixes and improvements, and 190 important new features. 191 The most significant addition is the new experimental 192 implementation of WebSockets contributed by David Gausmann. This 193 implementation is not fully tested yet so currently it is disabled 194 by default. 195 Other changes include a lot of improvements and clarifications 196 in doxy comments in microhttpd.h header file, improved compliance 197 with the RFC HTTP specifications, the new implementation of reply 198 header forming, the new implementation of request chunked encoding 199 parsing, new automatic error replies, internal optimisations, and 200 many important fixes, including fixes for long-standing bugs. 201 202 More detailed list of notable changes: 203 204 API changes: 205 + Added new function MHD_get_reason_phrase_len_for(). 206 + Added MHD_CONNECTION_INFO_HTTP_STATUS type of information 207 queried by MHD_get_connection_info(). 208 + Added new response flag MHD_RF_SEND_KEEP_ALIVE_HEADER to force 209 sending of "keep-alive" header even if not required by RFC. 210 + Added new response creation function 211 MHD_create_response_from_buffer_with_free_callback_cls() with 212 custom cleanup callback. 213 + Added new response flag MHD_RF_HTTP_1_0_COMPATIBLE_STRICT with 214 the same functionality as existing MHD_RF_HTTP_VERSION_1_0_ONLY 215 flag. The old flag will be deprecated. 216 + Added new response flag MHD_RF_HTTP_1_0_SERVER with the same 217 functionality as existing MHD_RF_HTTP_VERSION_1_0_RESPONSE flag. 218 The old flag will be deprecated. 219 220 New features: 221 + Added experimental WebSockets extension with separate header. 222 Disabled by default as it is not fully tested yet. 223 + Added '--enable-sanitizers[=address,undefined,leak,user-poison]' 224 configure parameter (instead of '--enable-sanitizer'), 225 implemented custom memory poisoning for memory pools. 226 227 Improvements and enhancements: 228 * Doxy function descriptions was corrected, clarified, extended, 229 and improved. Now it should be much easier to learn MHD just by 230 reading the headers. 231 * Completely rewritten reply header forming. New implementation is 232 more robust, simpler maintainable and expandable, and better 233 follows RFC HTTP specifications. 234 * Performance improvements: now HTTP version and request method are 235 decoded one time only (previously MHD used string comparison many 236 times during processing the data). 237 * Rewritten request chunked payload decoding. The new 238 implementation better conforms to the HTTP RFC, detects format 239 problems earlier, replies to the clients with description of 240 detected problems, handles untypical (but syntactically correct) 241 values properly. 242 * Added special replies for wrong/unsupported HTTP versions in 243 requests, broken HTTP chunked encoding in requests, 244 * As required by HTTP RFC, added automatic error replies if client 245 used broken chunked encoding, too large chunk size, too large 246 payload size, or broken Content-Length header. 247 * Optimized connection's memory pool handling. 248 * Changed timeout precision from one second to one millisecond. 249 * Added some checks for incorrect user data, reporting problems in 250 MHD log. 251 * Improved performance of hash calculations functions by using 252 compiler built-ins (if available). 253 * Implemented SHA-1 calculations (required for WebSockets). 254 * Added universal MSVC project that works with any (sufficiently 255 new) version of MSVC. 256 * Developed simple HTTP client to test MHD under very special 257 conditions. 258 * Implemented 45 new tests. 259 * Improved existing tests to test more aspects of MHD. 260 * Added check for correct results of system and libcurl functions. 261 * Response headers are checked during forming of responses. 262 * HTTPS tests were improved. 263 * Added rebuild on W32 of all required files if files are missing. 264 * Many internal optimisations and improvements. 265 266 Functionality changes: 267 * Keep-alive header is omitted by default for HTTP/1.1 connections. 268 Use of header can be enforced by response flag. 269 * Chunked encoding is used for HTTP/1.1 non-keep-alive connections 270 for responses with unknown size. Previously MHD used "indication 271 of the end of the response by closing connection" in such cases, 272 however it is not correct for HTTP/1.1 connections as per HTTP 273 RFC. 274 * As required by HTTP RFC, use HTTP/1.1 version instead of HTTP/1.0 275 in reply headers when client is HTTP/1.0 . HTTP/1.0 version can 276 be enforced by response flag. 277 * User response headers are used in replies in the same order as 278 was added by application. 279 * Allowed tab characters in response header values. 280 * All custom "Connection:" response headers are automatically 281 combined into single "Connection:" header. 282 * "keep-alive" token silently dropped from custom "Connection:" 283 response header. "Keep-alive" cannot be enforced and used 284 automatically if possible. 285 * Allow tab character in custom response header value. 286 * Disallow space character in custom response header value. 287 * Do not allow responses with 1xx codes for HTTP/1.0 requests. 288 * Detected and reported incorrect "Upgrade" responses. 289 * W32 targets are changed to Vista+ by default. XP is supported 290 still. 291 292 Fixes: 293 # Fixed short busy-waiting (up to one second) when connection is 294 going to be expired and closed. 295 # Fixed handling of errors during start of new connection, fixed 296 inability to accept new connections in thread-per-connection mode 297 due to the missing decrement of number of daemon's connections if 298 start of new thread is failed. 299 # Fixed incorrect parsing of LFLF, LFCR, CRCR, and bare CR as 300 single linefeed in request header and request chunked payload. 301 Now only CRLF or bare LF are recognized as linefeed. 302 # Fixed response chunked encoding handling. Now it works properly 303 with non-keep-alive connection, with fixed size replies (if 304 chunked was enforced by header), and in other situations. 305 # Other fixes for chunked replies. 306 # Fixed handling of custom connection timeout in thread-per- 307 connection mode. 308 # Fixed wrongly used MHD_REQUEST_TERMINATED_COMPLETED_OK code for 309 application notification when MHD_REQUEST_TERMINATED_WITH_ERROR 310 code must be used. 311 # Fixed code MHD_REQUEST_TERMINATED_READ_ERROR not reported (code 312 MHD_REQUEST_TERMINATED_WITH_ERROR was incorrectly used instead). 313 # Fixed handling of request chunked encoding with untypical 314 formatting. 315 # Fixed processing of last part of hex-encoded values under 316 certain conditions. 317 # Fixed value returned for MHD_CONNECTION_INFO_REQUEST_HEADER_SIZE. 318 # Fixed returned value for MHD_FEATURE_AUTOSUPPRESS_SIGPIPE on W32, 319 now it is MHD_YES as W32 does not need SIGPIPE suppression. 320 # Fixed portability of bitwise NOT for enums values. 321 # Fixed SHA-256 and MD5 calculations with unaligned data. 322 # Fixed incorrect caseless matching for HTTP version. 323 # Fixed incorrect caseless matching for request method. 324 # Fixed compatibility with old GnuTLS versions. 325 # Fixed compiler warnings on 32-bits platforms. 326 # Fixed blocking sockets setting in tests and examples for W32. 327 # Fixed examples to really use libmagic if present. 328 # HTTPS tests were fixed. 329 # Fixed libcurl test with case-insensitive match for HTTP methods, 330 method names must use case-sensitive match. 331 # Fixed tests compatibility with old libcurl versions. 332 # Fixed build on W32 with llvm-dlltool (this tool is too 333 oversimplified) 334 335 -- Evgeny Grin (Karlson2k) 336 337 338 Sun 25 Apr 2021 14:00:00 MSK 339 Released GNU libmicrohttpd 0.9.73 340 341 This release brings new features, improvements, and a few fixes. 342 The most important addition is the new function for vector-backed 343 responses, based on the patch contributed by NASA engineers. 344 Other changes include compatibility with autoconf 2.70+, improved 345 testsuite compatibility with CI systems, fixed and improved MSVC 346 builds, and implementation of ALPN support. 347 348 More detailed list of notable changes: 349 350 API changes: 351 + Added new function MHD_create_response_from_iovec(), based on the 352 patch provided by Lawrence Sebald and Damon N. Earp from NASA. 353 + Added MHD_OPTION_SIGPIPE_HANDLED_BY_APP daemon option. 354 + Added new function MHD_run_wait(). 355 + Added MHD_OPTION_TLS_NO_ALPN to disable usage of ALPN even if 356 it is supported by TLS library. 357 358 New features: 359 + Added '--enable-heavy-tests' configure parameter (disabled by 360 default). 361 + Implemented support for ALPN. 362 363 Improvements and enhancements: 364 * Return timeout of zero also for connections awaiting cleanup. 365 * Compatibility with autoconf >=2.70, used new autoconf features. 366 * Warn user when custom logger option is not the first option. 367 * Added information to the header about minimal MHD version when 368 particular symbols were introduced. 369 * Updated test certificates to be compatible with modern browsers. 370 * Added on-fly detection of UNIX domain sockets and pipes, MHD does 371 not try to use TCP/IP-specific socket options on them. 372 * Report more detailed error description in the MHD log for send 373 and receive errors. 374 * Enabled bind port autodetection for MSVC builds. 375 376 Fixes: 377 # Fix PostProcessor to always properly stop iteration when 378 application callback tells it to do so. 379 # Fixed MD5 digest authorization broken when compiled without 380 variable length arrays support (notably with MSVC). 381 # Fixed detection of type of send errors on W32. 382 383 -- Evgeny Grin (Karlson2k) 384 385 386 Mon 28 Dec 2020 21:36:00 MSK 387 Released GNU libmicrohttpd 0.9.72 388 389 This release is mostly a bugfix release, with greatly improved 390 compatibility with various OSes/kernels, including FreeBSD, Windows, 391 OpenBSD, NetBSD, Darwin (macOS), Solaris. Performance is improved, 392 especially with HTTPS connections and stay-alive HTTP connections. 393 394 Notable changes since version 0.9.71: 395 396 API changes: 397 + New function MHD_create_response_from_pipe() 398 399 Improvements and enhancements: 400 * Fully rewritten code for buffering/pushing from kernel network buffers 401 for compatibility with various OSes. Reduced number of additional 402 sys-calls, network is better utilized, responses are delivered faster. 403 * Restored optimal sendfile() usage on FreeBSD. 404 * MHD now takes care about SIGPIPE handling by blocking it in internal 405 threads and avoiding functions (like sendfile()) that could generate 406 SIGPIPE when blocking of this signal is not possible. 407 408 Fixes: 409 # Fixed crash in PostProcessor. 410 # Fixed several resources leaks in corner cases. 411 # Improved thread sync, thread safety and fixed one use-after-free under 412 special conditions during stopping of daemon. 413 # Updated HTTP status codes, header names and methods from the 414 registries. 415 # Fixed functioning without listen socket and with internal threads. 416 # Fixed streaming of chunked responses for both HTTP and HTTPS. 417 # Various compatibility fixes. 418 419 -- Evgeny Grin (Karlson2k) 420 421 422 Tue Jan 9 20:52:48 MST 2007 423 Project posted.