CVE-2026-63380

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Source

https://cve.org/CVERecord?id=CVE-2026-63380

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63380.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-63380

Aliases

GHSA-3rpf-frgx-xq34

Downstream

AZL-96912

UBUNTU-CVE-2026-63380

Published

2026-08-20T17:52:29Z

Modified

2026-09-11T08:36:40Z

Severity

5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Libevent: Null Pointer Dereference in `evws_new_session`

Details

Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails. evws_connection_free sees a non-null http_server and unconditionally calls TAILQ_REMOVE even though the session was never inserted into http_server->ws_sessions. A local caller able to induce this allocation or locking failure can crash the process. This issue is fixed in version 2.2.2-alpha.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-416",
        "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63380.json"
}

References

Affected packages

Git / github.com/libevent/libevent

Affected ranges

Type

GIT

Repo

https://github.com/libevent/libevent

Events

Introduced

Fixed

825c18bd99f556b59d61200523237f264d5cc734

Fixed

df3ecad3a040fd6d4fad4287defe113395de6fd7

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.2.2-alpha"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

release-1.*

release-1.1b

release-2.*

release-2.0.1-alpha

release-2.0.10-stable

release-2.0.3-alpha

release-2.0.4-alpha

release-2.0.5-beta

release-2.0.6-rc

release-2.0.7-rc

release-2.0.8-rc

release-2.0.9-rc

release-2.1.1-alpha

release-2.1.2-alpha

release-2.1.3-alpha

release-2.1.4-alpha

release-2.1.5-beta

release-2.1.6-beta

release-2.1.7-rc

release-2.1.8-stable

release-2.2.1-alpha

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63380.json"

vanir_signatures

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vanir_signatures_modified

"2026-09-11T08:36:40Z"