{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53587",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-09T19:11:53.484Z",
        "datePublished": "2026-08-20T18:36:43.055Z",
        "dateUpdated": "2026-08-20T19:18:33.821Z"
    },
    "containers": {
        "cna": {
            "title": "libgit2 - Unauthenticated network-reachable heap out-of-bounds read in transports/smart_pkt.c:set_data",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-20",
                            "lang": "en",
                            "description": "CWE-20: Improper Input Validation",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-125",
                            "lang": "en",
                            "description": "CWE-125: Out-of-bounds Read",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-126",
                            "lang": "en",
                            "description": "CWE-126: Buffer Over-read",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1284",
                            "lang": "en",
                            "description": "CWE-1284: Improper Validation of Specified Quantity in Input",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab0db28239462a671e2e5440e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab0db28239462a671e2e5440e"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20ad3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20ad3"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7640",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7640"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5"
                }
            ],
            "affected": [
                {
                    "vendor": "libgit2",
                    "product": "libgit2",
                    "versions": [
                        {
                            "version": "< 1.8.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.9.0, < 1.9.5",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T18:36:43.055Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. This issue is fixed in versions 1.8.6 and 1.9.5."
                }
            ],
            "source": {
                "advisory": "GHSA-pm24-4jhq-3xvm",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-20T19:18:28.320266Z",
                                "id": "CVE-2026-53587",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-20T19:18:33.821Z"
                }
            }
        ]
    }
}