{"id":"CURL-CVE-2023-28320","summary":"siglongjmp race condition","details":"libcurl provides several different backends for resolving hostnames, selected\nat build time. If it is built to use the synchronous resolver, it allows name\nresolves to time-out slow operations using `alarm()` and `siglongjmp()`.\n\nWhen doing this, libcurl used a global buffer that was not mutex protected and\na multi-threaded application might therefore crash or otherwise misbehave.","aliases":["CVE-2023-28320"],"modified":"2026-04-25T20:30:12.107845Z","published":"2023-05-17T08:00:00Z","database_specific":{"award":{"amount":"480","currency":"USD"},"severity":"Low","affects":"lib","www":"https://curl.se/docs/CVE-2023-28320.html","URL":"https://curl.se/docs/CVE-2023-28320.json","CWE":{"id":"CWE-662","desc":"Improper Synchronization"},"package":"curl","last_affected":"8.0.1","issue":"https://hackerone.com/reports/1929597"},"affected":[{"ranges":[{"type":"SEMVER","events":[{"introduced":"7.9.8"},{"fixed":"8.1.0"}]},{"type":"GIT","repo":"https://github.com/curl/curl.git","events":[{"introduced":"3c49b405de4fbf1fd7127f91908261268640e54f"},{"fixed":"13718030ad4b3209a7583b4f27f683cd3a6fa5f2"}]}],"versions":["8.0.1","8.0.0","7.88.1","7.88.0","7.87.0","7.86.0","7.85.0","7.84.0","7.83.1","7.83.0","7.82.0","7.81.0","7.80.0","7.79.1","7.79.0","7.78.0","7.77.0","7.76.1","7.76.0","7.75.0","7.74.0","7.73.0","7.72.0","7.71.1","7.71.0","7.70.0","7.69.1","7.69.0","7.68.0","7.67.0","7.66.0","7.65.3","7.65.2","7.65.1","7.65.0","7.64.1","7.64.0","7.63.0","7.62.0","7.61.1","7.61.0","7.60.0","7.59.0","7.58.0","7.57.0","7.56.1","7.56.0","7.55.1","7.55.0","7.54.1","7.54.0","7.53.1","7.53.0","7.52.1","7.52.0","7.51.0","7.50.3","7.50.2","7.50.1","7.50.0","7.49.1","7.49.0","7.48.0","7.47.1","7.47.0","7.46.0","7.45.0","7.44.0","7.43.0","7.42.1","7.42.0","7.41.0","7.40.0","7.39.0","7.38.0","7.37.1","7.37.0","7.36.0","7.35.0","7.34.0","7.33.0","7.32.0","7.31.0","7.30.0","7.29.0","7.28.1","7.28.0","7.27.0","7.26.0","7.25.0","7.24.0","7.23.1","7.23.0","7.22.0","7.21.7","7.21.6","7.21.5","7.21.4","7.21.3","7.21.2","7.21.1","7.21.0","7.20.1","7.20.0","7.19.7","7.19.6","7.19.5","7.19.4","7.19.3","7.19.2","7.19.1","7.19.0","7.18.2","7.18.1","7.18.0","7.17.1","7.17.0","7.16.4","7.16.3","7.16.2","7.16.1","7.16.0","7.15.5","7.15.4","7.15.3","7.15.2","7.15.1","7.15.0","7.14.1","7.14.0","7.13.2","7.13.1","7.13.0","7.12.3","7.12.2","7.12.1","7.12.0","7.11.2","7.11.1","7.11.0","7.10.8","7.10.7","7.10.6","7.10.5","7.10.4","7.10.3","7.10.2","7.10.1","7.10","7.9.8"],"database_specific":{"vanir_signatures_modified":"2026-04-25T20:30:12Z","vanir_signatures":[{"id":"CURL-CVE-2023-28320-292fde32","digest":{"line_hashes":["283258619443369758452086874976551086282","121936838467444647657318452219757000709","247646888058421310640421957552875963192","286525491516044047541513178293818312180","50035147135556071914751473867996997039","193835399249291899032021760430948152705","207828755606904047829573123970923045779","81370743706062931358801952691125996802","249186086637486552515111953072156234063","328891460933912972369878433911601836268","67949404355840492349118776286053533367","115617167124307632986698130414800913904","224406317650944904426169011016550815159","205436267014276535737795570081430003290","271831745145625465732623324140517984448","283792094845170139656042657687200455670","25376866905598318983192313641098571612","20893781658787869202328702021990935069","47804619708803871720584697045341841861","275329750890998700276072857030451348664"],"threshold":0.9},"target":{"file":"lib/hostip.c"},"deprecated":false,"signature_type":"Line","signature_version":"v1","source":"https://github.com/curl/curl.git/commit/13718030ad4b3209a7583b4f27f683cd3a6fa5f2"},{"id":"CURL-CVE-2023-28320-94ed09a9","digest":{"length":2181,"function_hash":"166424419131360272668421286654252876677"},"target":{"file":"lib/hostip.c","function":"Curl_resolv_timeout"},"deprecated":false,"signature_type":"Function","signature_version":"v1","source":"https://github.com/curl/curl.git/commit/13718030ad4b3209a7583b4f27f683cd3a6fa5f2"}],"source":"https://curl.se/docs/CURL-CVE-2023-28320.json"}}],"schema_version":"1.7.5","credits":[{"name":"Harry Sintonen","type":"FINDER"},{"name":"Harry Sintonen","type":"REMEDIATION_DEVELOPER"},{"name":"Daniel Stenberg","type":"REMEDIATION_DEVELOPER"}]}