Vulnerability-Lookup

CVE-2026-63388 (GCVE-0-2026-63388)

Vulnerability from cvelistv5 – Published: 2026-08-20 17:44 – Updated: 2026-08-21 21:46

Title

Libevent: Heap out-of-bounds write in bufferevent_socket_set_conn_address_ reachable via AF_UNIX accept

Summary

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 21:00 UTC

CWE

CWE-617 - Reachable Assertion
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/libevent/libevent/security/adv…	x_refsource_CONFIRM
https://github.com/libevent/libevent/commit/52057…	x_refsource_MISC
https://github.com/libevent/libevent/commit/ef38f…	x_refsource_MISC
https://github.com/libevent/libevent/releases/tag…	x_refsource_MISC
https://github.com/libevent/libevent/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
libevent	libevent	Affected: < 2.1.13 Affected: >= 2.2.0-alpha, < 2.2.2-alpha	guessed

Show details on NVD website

JSON

To clipboard

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MSRC_CVE-2026-63388

Vulnerability from csaf_microsoft - Published: 2026-08-22 01:03 - Updated: 2026-08-25 01:05

Summary

Libevent: Heap out-of-bounds write in bufferevent_socket_set_conn_address_ reachable via AF_UNIX accept

Scope

1 vulnerability in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Known affected: 6 products

Open the full advisory

OESA-2026-3268 (CVE-2026-63379)

Vulnerability from osv_openeuler – Published: 2026-08-07 02:42 – Updated: 2026-08-07 02:42 – Source website

Summary

libevent security update

Details

Libevent additionally provides a sophisticated framework for buffered network IO, with support for sockets, filters, rate-limiting, SSL, zero-copy file transmission, and IOCP. Libevent includes support for several useful protocols, including DNS, HTTP, and a minimal RPC framewor.

Security Fix(es):

The updated packages fix some security vulnerabilities. libevent is a lightweight event notification library used for handling event loops and callback mechanisms, widely used in network applications.(CVE-2026-63379)

The updated packages fix some security vulnerabilities affecting the libevent library.(CVE-2026-63381)

The updated packages fix some security vulnerabilities.(CVE-2026-63382)

The updated packages fix some security vulnerabilities.(CVE-2026-63383)

The updated packages fix some security vulnerabilities.(CVE-2026-63384)

The updated packages fix some security vulnerabilities.(CVE-2026-63385)

The updated packages fix some security vulnerabilities.(CVE-2026-63387)

The updated packages fix some security vulnerabilities.(CVE-2026-63388)

Severity

8.4 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63379	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63381	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63382	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63383	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63384	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63385	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63387	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-63388	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libevent-2.1.12-17.oe2403sp4.aarch64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp4.aarch64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp4.aarch64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp4.aarch64.rpm"
        ],
        "src": [
          "libevent-2.1.12-17.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "libevent-2.1.12-17.oe2403sp4.x86_64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp4.x86_64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp4.x86_64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "libevent",
        "purl": "pkg:rpm/openEuler/libevent\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.12-17.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libevent-2.1.12-7.oe2003sp4.aarch64.rpm",
          "libevent-debuginfo-2.1.12-7.oe2003sp4.aarch64.rpm",
          "libevent-debugsource-2.1.12-7.oe2003sp4.aarch64.rpm",
          "libevent-devel-2.1.12-7.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "libevent-2.1.12-7.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libevent-2.1.12-7.oe2003sp4.x86_64.rpm",
          "libevent-debuginfo-2.1.12-7.oe2003sp4.x86_64.rpm",
          "libevent-debugsource-2.1.12-7.oe2003sp4.x86_64.rpm",
          "libevent-devel-2.1.12-7.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "libevent",
        "purl": "pkg:rpm/openEuler/libevent\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.12-7.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libevent-2.1.12-11.oe2203sp4.aarch64.rpm",
          "libevent-debuginfo-2.1.12-11.oe2203sp4.aarch64.rpm",
          "libevent-debugsource-2.1.12-11.oe2203sp4.aarch64.rpm",
          "libevent-devel-2.1.12-11.oe2203sp4.aarch64.rpm"
        ],
        "src": [
          "libevent-2.1.12-11.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libevent-2.1.12-11.oe2203sp4.x86_64.rpm",
          "libevent-debuginfo-2.1.12-11.oe2203sp4.x86_64.rpm",
          "libevent-debugsource-2.1.12-11.oe2203sp4.x86_64.rpm",
          "libevent-devel-2.1.12-11.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "libevent",
        "purl": "pkg:rpm/openEuler/libevent\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.12-11.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libevent-2.1.12-17.oe2403sp1.aarch64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp1.aarch64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp1.aarch64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp1.aarch64.rpm"
        ],
        "src": [
          "libevent-2.1.12-17.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libevent-2.1.12-17.oe2403sp1.x86_64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp1.x86_64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp1.x86_64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "libevent",
        "purl": "pkg:rpm/openEuler/libevent\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.12-17.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libevent-2.1.12-17.oe2403sp3.aarch64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp3.aarch64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp3.aarch64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp3.aarch64.rpm"
        ],
        "src": [
          "libevent-2.1.12-17.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "libevent-2.1.12-17.oe2403sp3.x86_64.rpm",
          "libevent-debuginfo-2.1.12-17.oe2403sp3.x86_64.rpm",
          "libevent-debugsource-2.1.12-17.oe2403sp3.x86_64.rpm",
          "libevent-devel-2.1.12-17.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "libevent",
        "purl": "pkg:rpm/openEuler/libevent\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.12-17.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Libevent additionally provides a sophisticated framework for buffered network IO, with support for sockets, filters, rate-limiting, SSL, zero-copy file transmission, and IOCP. Libevent includes support for several useful protocols, including DNS, HTTP, and a minimal RPC framewor.\r\n\r\nSecurity Fix(es):\n\nThe updated packages fix some security vulnerabilities. libevent is a lightweight event notification library used for handling event loops and callback mechanisms, widely used in network applications.(CVE-2026-63379)\n\nThe updated packages fix some security vulnerabilities affecting the libevent library.(CVE-2026-63381)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63382)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63383)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63384)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63385)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63387)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63388)",
  "id": "OESA-2026-3268",
  "modified": "2026-08-07T02:42:54Z",
  "published": "2026-08-07T02:42:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3268"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63379"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63381"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63382"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63383"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63384"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63385"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63387"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63388"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libevent security update",
  "upstream": [
    "CVE-2026-63379",
    "CVE-2026-63381",
    "CVE-2026-63382",
    "CVE-2026-63383",
    "CVE-2026-63384",
    "CVE-2026-63385",
    "CVE-2026-63387",
    "CVE-2026-63388"
  ]
}

RHSA-2026:60853

Vulnerability from csaf_redhat - Published: 2026-08-29 13:59 - Updated: 2026-10-05 18:23

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

A flaw was found in Libevent. A heap out-of-bounds write vulnerability in the `bufferevent_socket_set_conn_address_` function allows an unauthenticated local peer to achieve arbitrary code execution. By connecting to an AF_UNIX listener, an attacker can overwrite critical heap data, leading to memory corruption and potentially full control over the affected system. This can severely impact the confidentiality, integrity, and availability of data and services.

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 7 products

https://access.redhat.com/errata/RHSA-2026:60853

Open the full advisory

RHSA-2026:71603

Vulnerability from csaf_redhat - Published: 2026-09-24 11:59 - Updated: 2026-10-14 19:11

Summary

Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 security update

Severity

Important

Scope

52 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 5 products

https://access.redhat.com/errata/RHSA-2026:71603

Open the full advisory

RHSA-2026:72394

Vulnerability from csaf_redhat - Published: 2026-09-28 07:02 - Updated: 2026-10-17 14:34

Summary

Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1

Severity

Important

Scope

53 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 4 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2026:72394

Open the full advisory

RHSA-2026:72395

Vulnerability from csaf_redhat - Published: 2026-09-28 07:03 - Updated: 2026-10-17 14:34

Summary

Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1

Severity

Important

Scope

57 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:72395

Open the full advisory

RHSA-2026:72399

Vulnerability from csaf_redhat - Published: 2026-09-28 07:22 - Updated: 2026-10-17 14:34

Summary

Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1

Severity

Important

Scope

53 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:72399

Open the full advisory

RHSA-2026:67908

Vulnerability from csaf_opensuse - Published: 2026-09-16 12:30 - Updated: 2026-10-13 07:39

Summary

Red Hat Security Advisory: libevent security update

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 32 products

https://access.redhat.com/errata/RHSA-2026:67908

Open the full advisory

RHSA-2026:67909

Vulnerability from csaf_opensuse - Published: 2026-09-16 12:36 - Updated: 2026-10-13 07:39

Summary

Red Hat Security Advisory: libevent security update

Severity

Important

Scope

8 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 26 products

https://access.redhat.com/errata/RHSA-2026:67909

Open the full advisory

RHSA-2026:67910

Vulnerability from csaf_opensuse - Published: 2026-09-16 13:48 - Updated: 2026-10-13 07:39

Summary

Red Hat Security Advisory: libevent security update

Severity

Important

Scope

8 vulnerabilities in this advisory, including CVE-2026-63388.

CVE-2026-63388

8.4 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 32 products

https://access.redhat.com/errata/RHSA-2026:67910

Open the full advisory

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-63388 (GCVE-0-2026-63388)

OESA-2026-3268 (CVE-2026-63379)

Tags

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Nomenclature

Vulnerability timeline

Related by attack behaviour