{"id":"CVE-2026-114550","aliases":["DEBIAN-CVE-2026-114550","EUVD-2026-116626","GHSA-64rj-2w6g-r32v","OESA-2026-4694","OESA-2026-4695","OESA-2026-4696","OESA-2026-4741","UBUNTU-CVE-2026-114550"],"status":"published","title":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00842,"percentile":0.58411,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-787"],"published":"2026-11-03T23:47:02Z","modified":"2026-11-11T12:45:04Z","exploits":[{"source":"pocgithub","id":"googlesky/CVE-2026-114550","title":"googlesky/CVE-2026-114550","date":"2026-11-05","url":"https://github.com/googlesky/CVE-2026-114550"}],"fixes":[{"ecosystem":"openEuler:22.03-LTS-SP4","package":"libwebsockets","fixed_in":["4.3.0-13.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"libwebsockets","fixed_in":["4.3.3-10.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP3","package":"libwebsockets","fixed_in":["4.3.3-10.oe2403sp3"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP4","package":"libwebsockets","fixed_in":["4.3.3-10.oe2403sp4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.6-3","4.1.6-3.1","4.3.2-1","4.3.2-2","4.3.2-3","4.3.2-4","4.3.3-1","4.3.3-1.1","4.3.3-1.1~exp1","4.3.5-1","4.3.5-2","4.3.5-3","4.3.5-4","4.3.5-4.1","4.3.5-5","4.3.5-6","4.3.5-7"]},{"source":"osv","ecosystem":"Debian:13","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-1","4.3.5-1+deb13u1","4.3.5-1+deb13u2","4.3.5-1+deb13u3","4.3.5-2","4.3.5-3","4.3.5-4","4.3.5-4.1","4.3.5-5","4.3.5-6","4.3.5-7"]},{"source":"osv","ecosystem":"Debian:14","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-1","4.3.5-2","4.3.5-3","4.3.5-4","4.3.5-4.1","4.3.5-5","4.3.5-6","4.3.5-7"]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP4","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.0-13.oe2203sp4"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.3-10.oe2403sp1"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP3","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.3-10.oe2403sp3"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP4","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.3-10.oe2403sp4"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.2-1","1.6.0-3","1.6.0-4","1.6.0-5","1.6.1-1","1.7.0-1ubuntu1","1.7.0-2","1.7.1-1","1.7.1-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.3-3","2.0.3-3build1","2.0.3-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.3-3build1","3.2.1-3","3.2.1-3ubuntu0.1~esm1","3.2.1-3ubuntu0.1~esm2","3.2.1-3ubuntu0.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.20-2","4.0.20-2ubuntu1","4.0.20-2ubuntu1.1","4.0.20-2ubuntu1.1+esm1","4.0.20-2ubuntu1.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.2-4","4.3.3-1","4.3.3-1.1build1","4.3.3-1.1build2","4.3.3-1.1build3","4.3.3-1.1ubuntu0.1~esm1","4.3.3-1.1ubuntu0.1~esm2","4.3.3-1.1ubuntu0.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-3ubuntu1","4.3.5-4.1","4.3.5-5","4.3.5-5ubuntu1","4.3.5-5ubuntu2","4.3.5-7ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"libwebsockets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-1","4.3.5-3","4.3.5-3ubuntu1","4.3.5-3ubuntu1.1","4.3.5-3ubuntu1.2+esm1"]}],"products":[{"vendor":"libwebsockets","product":"libwebsockets"},{"vendor":"warmcat","product":"libwebsockets"}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-792/","tags":["x_research-advisory","advisory","report"]},{"url":"https://github.com/warmcat/libwebsockets/commit/c9e8e1834d7f13038c82963086b90e2ee9c5b44c","tags":["vendor-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114550","tags":["advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-792"},{"url":"https://github.com/advisories/GHSA-64rj-2w6g-r32v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114550.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-114550","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4694","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4695","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4696","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4741","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-114550","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-114550","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-114550","title":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-03T23:47:02.249Z","modified":"2026-11-06T18:55:07.231Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T19:59:18.98792Z"}],"euvd":[{"id":"EUVD-2026-116626","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-03T23:47:02Z","modified":"2026-11-06T18:55:07Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-06T20:06:05.664912Z"}],"ghsa":[{"id":"GHSA-64rj-2w6g-r32v","title":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution...","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-04T00:32:19Z","modified":"2026-11-04T00:32:24Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-04T00:48:26.298057Z"}],"nvd":[{"id":"CVE-2026-114550","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-04T00:17:22.783Z","modified":"2026-11-12T20:28:31.817Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T22:02:16.475328Z"}],"osv":[{"id":"CVE-2026-114550","title":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-03T23:47:02.249Z","modified":"2026-11-11T13:20:03.232441026Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-07T11:15:38.581573Z"},{"id":"DEBIAN-CVE-2026-114550","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.  The specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-04T00:17:22.783Z","modified":"2026-11-08T18:00:06.66698202Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-07T10:14:39.995311Z"},{"id":"OESA-2026-4694","title":"libwebsockets security update","description":"Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nA vulnerability classified as critical has been found in libwebsockets (affected version unknown). CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-114550)","status":"published","published":"2026-11-04T13:54:34Z","modified":"2026-11-04T14:00:08.783854091Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4695","title":"libwebsockets security update","description":"Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nA vulnerability classified as critical has been found in libwebsockets (affected version unknown). CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-114550)","status":"published","published":"2026-11-04T13:54:35Z","modified":"2026-11-04T14:00:08.731758436Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4696","title":"libwebsockets security update","description":"Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nA vulnerability classified as critical has been found in libwebsockets (affected version unknown). CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-114550)","status":"published","published":"2026-11-04T13:54:35Z","modified":"2026-11-04T14:00:08.78060828Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-04T14:10:46.921518Z"},{"id":"OESA-2026-4741","title":"libwebsockets security update","description":"Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nlibwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.(CVE-2026-114550)","status":"published","published":"2026-11-11T12:25:43Z","modified":"2026-11-11T12:45:04.175918934Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"UBUNTU-CVE-2026-114550","description":"libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.","status":"published","published":"2026-11-04T00:17:00Z","modified":"2026-11-05T11:45:52.071710794Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T13:30:15.321876Z"}]}}