usn-8710-1
Vulnerability from osv_ubuntu
Published
2026-09-01 15:27
Modified
2026-09-01 15:27
Summary
libevent vulnerabilities
Details
Alexis Challande discovered that libevent incorrectly handled certain empty output buffers. An attacker could possibly use this issue to trigger a use-after-free, resulting in a denial of service or arbitrary code execution. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-63381)
Rajat Raghav discovered that libevent incorrectly handled certain HTTP requests. An attacker could possibly use this issue to desynchronize HTTP request boundaries, resulting in HTTP request smuggling. (CVE-2026-63382)
Qiu Sihao discovered that libevent incorrectly handled certain malformed tagged RPC data. An attacker could possibly use this issue to trigger an out-of-bounds read, resulting in a denial of service. (CVE-2026-63383)
Qiu Sihao discovered that libevent incorrectly handled certain large payload lengths in tagged RPC data. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. (CVE-2026-63384)
Asaf Meizner discovered that libevent incorrectly handled certain HTTP URIs and header values. An attacker could possibly use this issue to cause HTTP messages to be interpreted inconsistently, resulting in security restrictions being bypassed. (CVE-2026-63385)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:14.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libevent-2.0-5",
"binary_version": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
},
{
"binary_name": "libevent-core-2.0-5",
"binary_version": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
},
{
"binary_name": "libevent-extra-2.0-5",
"binary_version": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
},
{
"binary_name": "libevent-openssl-2.0-5",
"binary_version": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
},
{
"binary_name": "libevent-pthreads-2.0-5",
"binary_version": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.0.21-stable-1ubuntu1.14.04.2+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.21-stable-1ubuntu1.14.04.2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.21-stable-1",
"2.0.21-stable-1ubuntu1",
"2.0.21-stable-1ubuntu1.14.04.1",
"2.0.21-stable-1ubuntu1.14.04.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
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"binary_version": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
},
{
"binary_name": "libevent-core-2.0-5",
"binary_version": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
},
{
"binary_name": "libevent-extra-2.0-5",
"binary_version": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
},
{
"binary_name": "libevent-openssl-2.0-5",
"binary_version": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
},
{
"binary_name": "libevent-pthreads-2.0-5",
"binary_version": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.0.21-stable-2ubuntu0.16.04.1+esm1?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.21-stable-2ubuntu0.16.04.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.21-stable-2",
"2.0.21-stable-2ubuntu0.16.04.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63381",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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},
{
"score": "medium",
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}
]
},
{
"id": "CVE-2026-63385",
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{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libevent-2.1-6",
"binary_version": "2.1.8-stable-4ubuntu0.1~esm1"
},
{
"binary_name": "libevent-core-2.1-6",
"binary_version": "2.1.8-stable-4ubuntu0.1~esm1"
},
{
"binary_name": "libevent-extra-2.1-6",
"binary_version": "2.1.8-stable-4ubuntu0.1~esm1"
},
{
"binary_name": "libevent-openssl-2.1-6",
"binary_version": "2.1.8-stable-4ubuntu0.1~esm1"
},
{
"binary_name": "libevent-pthreads-2.1-6",
"binary_version": "2.1.8-stable-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.1.8-stable-4ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.8-stable-4ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.8-stable-4",
"2.1.8-stable-4build1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63381",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libevent-2.1-7",
"binary_version": "2.1.11-stable-1ubuntu0.1~esm1"
},
{
"binary_name": "libevent-core-2.1-7",
"binary_version": "2.1.11-stable-1ubuntu0.1~esm1"
},
{
"binary_name": "libevent-extra-2.1-7",
"binary_version": "2.1.11-stable-1ubuntu0.1~esm1"
},
{
"binary_name": "libevent-openssl-2.1-7",
"binary_version": "2.1.11-stable-1ubuntu0.1~esm1"
},
{
"binary_name": "libevent-pthreads-2.1-7",
"binary_version": "2.1.11-stable-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.1.11-stable-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.11-stable-1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.8-stable-4build1",
"2.1.11-stable-1~exp0",
"2.1.11-stable-1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63381",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libevent-2.1-7",
"binary_version": "2.1.12-stable-1ubuntu0.1"
},
{
"binary_name": "libevent-core-2.1-7",
"binary_version": "2.1.12-stable-1ubuntu0.1"
},
{
"binary_name": "libevent-extra-2.1-7",
"binary_version": "2.1.12-stable-1ubuntu0.1"
},
{
"binary_name": "libevent-openssl-2.1-7",
"binary_version": "2.1.12-stable-1ubuntu0.1"
},
{
"binary_name": "libevent-pthreads-2.1-7",
"binary_version": "2.1.12-stable-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.1.12-stable-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.12-stable-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.12-stable-1",
"2.1.12-stable-1build1",
"2.1.12-stable-1build2",
"2.1.12-stable-1build3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63381",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libevent-2.1-7t64",
"binary_version": "2.1.12-stable-9ubuntu2.1"
},
{
"binary_name": "libevent-core-2.1-7t64",
"binary_version": "2.1.12-stable-9ubuntu2.1"
},
{
"binary_name": "libevent-extra-2.1-7t64",
"binary_version": "2.1.12-stable-9ubuntu2.1"
},
{
"binary_name": "libevent-openssl-2.1-7t64",
"binary_version": "2.1.12-stable-9ubuntu2.1"
},
{
"binary_name": "libevent-pthreads-2.1-7t64",
"binary_version": "2.1.12-stable-9ubuntu2.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.1.12-stable-9ubuntu2.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.12-stable-9ubuntu2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.12-stable-9",
"2.1.12-stable-9ubuntu2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-63381",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63382",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63383",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63384",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-63385",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libevent-2.1-7t64",
"binary_version": "2.1.12-stable-10ubuntu0.1"
},
{
"binary_name": "libevent-core-2.1-7t64",
"binary_version": "2.1.12-stable-10ubuntu0.1"
},
{
"binary_name": "libevent-extra-2.1-7t64",
"binary_version": "2.1.12-stable-10ubuntu0.1"
},
{
"binary_name": "libevent-openssl-2.1-7t64",
"binary_version": "2.1.12-stable-10ubuntu0.1"
},
{
"binary_name": "libevent-pthreads-2.1-7t64",
"binary_version": "2.1.12-stable-10ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libevent",
"purl": "pkg:deb/ubuntu/libevent@2.1.12-stable-10ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.12-stable-10ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.12-stable-10build1",
"2.1.12-stable-10build2"
]
}
],
"aliases": [],
"details": "Alexis Challande discovered that libevent incorrectly handled certain\nempty output buffers. An attacker could possibly use this issue to\ntrigger a use-after-free, resulting in a denial of service or arbitrary\ncode execution. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04\nLTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-63381)\n\nRajat Raghav discovered that libevent incorrectly handled certain HTTP\nrequests. An attacker could possibly use this issue to desynchronize\nHTTP request boundaries, resulting in HTTP request smuggling.\n(CVE-2026-63382)\n\nQiu Sihao discovered that libevent incorrectly handled certain malformed\ntagged RPC data. An attacker could possibly use this issue to trigger an\nout-of-bounds read, resulting in a denial of service. (CVE-2026-63383)\n\nQiu Sihao discovered that libevent incorrectly handled certain large\npayload lengths in tagged RPC data. An attacker could possibly use this\nissue to consume excessive system resources, resulting in a denial of\nservice. (CVE-2026-63384)\n\nAsaf Meizner discovered that libevent incorrectly handled certain HTTP\nURIs and header values. An attacker could possibly use this issue to\ncause HTTP messages to be interpreted inconsistently, resulting in\nsecurity restrictions being bypassed. (CVE-2026-63385)",
"id": "USN-8710-1",
"modified": "2026-09-01T15:27:40Z",
"published": "2026-09-01T15:27:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8710-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63381"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63382"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63383"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63384"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63385"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "libevent vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-63381",
"UBUNTU-CVE-2026-63382",
"UBUNTU-CVE-2026-63383",
"UBUNTU-CVE-2026-63384",
"UBUNTU-CVE-2026-63385"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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