USN-8840-1: libevent Ubuntu

CVSS: UnknownPublished
Published 28-09-2026Last modified 29-09-2026
Open JSON

Vulnerability summary

USN-8840-1 is a vulnerability in libevent Ubuntu with no CVSS score yet.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
Not scored
0%100%
No EPSS score yet
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 2 · Downstream 0 · Related 2
CVE-2026-63387CVE-2026-63388

Timeline

  1. 28-09-2026
    PublishedVulnerability first disclosed.
  2. 29-09-2026
    Last modifiedVulnerability information updated.

Description

libevent vulnerabilities Michał Majchrowicz and Marcin Wyczechowski discovered that libevent incorrectly handled certain DNS responses. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-63387) It was discovered that libevent incorrectly handled certain connections. A local attacker could possibly use this issue to cause a denial of service or execute arbitrary code. 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-2026-63388)

CVSS metrics

Risk metrics not yet published.

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu1 product
  • libevent< 2.0.21-stable-1ubuntu1.14.04.2+esm2 | < 2.0.21-stable-2ubuntu0.16.04.1+esm2 | < 2.1.8-stable-4ubuntu0.1~esm2 | < 2.1.11-stable-1ubuntu0.1~esm2 | < 2.1.12-stable-1ubuntu0.2 | < 2.1.12-stable-9ubuntu2.2 | < 2.1.12-stable-10ubuntu0.2

1 vendor · 1 product

References

3 links