Libevent: From 2.2.0-alpha-dev until ...) (CVE-2026-63495)
CVE-2026-63495 is a vulnerability in the libevent library affecting multiple stable versions used in various Ubuntu LTS releases. The flaw impacts libevent versions including 2.0.21-stable and 2.1.8-stable through 2.1.12-stable variants. It has a CVSS 3.1 base score of 7.5, indicating a medium severity level. The vulnerability does not affect confidentiality or integrity but causes a high impact on availability. There are no known exploits in the wild and no explicit patch or remediation details provided in the available data.
AI Analysis
Technical Summary
Libevent, an event notification library, contains a vulnerability identified as CVE-2026-63495 affecting versions =2.0.21-stable-1 through various builds of 2.1.12-stable. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) indicates the vulnerability can be exploited remotely without privileges or user interaction, causing a denial of service (availability impact) without compromising confidentiality or integrity. The vulnerability affects multiple Ubuntu LTS versions from 14.04 through 26.04 where these libevent versions are used. No vendor advisory or patch information is provided, and no known exploits have been reported.
Potential Impact
The vulnerability allows remote attackers to cause a denial of service (availability impact) without requiring privileges or user interaction. Confidentiality and integrity are not affected. This could lead to service disruption in applications relying on the affected libevent versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor channels for updates. No known exploits currently exist, so immediate urgent action may not be required but vigilance is advised.
Libevent: From 2.2.0-alpha-dev until ...) (CVE-2026-63495)
Description
CVE-2026-63495 is a vulnerability in the libevent library affecting multiple stable versions used in various Ubuntu LTS releases. The flaw impacts libevent versions including 2.0.21-stable and 2.1.8-stable through 2.1.12-stable variants. It has a CVSS 3.1 base score of 7.5, indicating a medium severity level. The vulnerability does not affect confidentiality or integrity but causes a high impact on availability. There are no known exploits in the wild and no explicit patch or remediation details provided in the available data.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/libevent?arch=source&distro=trustypkg:deb/ubuntu/libevent?arch=source&distro=xenialpkg:deb/ubuntu/libevent?arch=source&distro=bionicpkg:deb/ubuntu/libevent?arch=source&distro=focalpkg:deb/ubuntu/libevent?arch=source&distro=jammypkg:deb/ubuntu/libevent?arch=source&distro=noblepkg:deb/ubuntu/libevent?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Libevent, an event notification library, contains a vulnerability identified as CVE-2026-63495 affecting versions =2.0.21-stable-1 through various builds of 2.1.12-stable. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) indicates the vulnerability can be exploited remotely without privileges or user interaction, causing a denial of service (availability impact) without compromising confidentiality or integrity. The vulnerability affects multiple Ubuntu LTS versions from 14.04 through 26.04 where these libevent versions are used. No vendor advisory or patch information is provided, and no known exploits have been reported.
Potential Impact
The vulnerability allows remote attackers to cause a denial of service (availability impact) without requiring privileges or user interaction. Confidentiality and integrity are not affected. This could lead to service disruption in applications relying on the affected libevent versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor channels for updates. No known exploits currently exist, so immediate urgent action may not be required but vigilance is advised.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-63495
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:14.04:LTS","Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a8c4c52acd9273b499be78c
Added to database: 08/24/2026, 13:51:14 UTC
Last enriched: 08/24/2026, 14:05:55 UTC
Last updated: 08/25/2026, 03:17:52 UTC
Views: 5
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