Vulnerability-Lookup

ALSA-2026:85814

Vulnerability from osv_almalinux – Published: 2026-10-20 00:00 – Updated: 2026-10-20 08:36 – Source website

Summary

Important: postgresql:18 security update

Details

PostgreSQL is an advanced object-relational database management system (DBMS).

Security Fix(es):

pgvector: pgvector: Arbitrary code execution via out-of-bounds write during IVFFlat index build (CVE-2026-103484)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:85814	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-103484	REPORT
	https://bugzilla.redhat.com/2544842	REPORT
	https://errata.almalinux.org/9/ALSA-2026-85814.html	ADVISORY

JSON

To clipboard

{
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  ],
  "details": "PostgreSQL is an advanced object-relational database management system (DBMS).  \n\nSecurity Fix(es):  \n\n  * pgvector: pgvector: Arbitrary code execution via out-of-bounds write during IVFFlat index build (CVE-2026-103484)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:85814",
  "modified": "2026-10-20T08:36:08Z",
  "published": "2026-10-20T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:85814"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-103484"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2544842"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-85814.html"
    }
  ],
  "related": [
    "CVE-2026-103484"
  ],
  "summary": "Important: postgresql:18 security update"
}

CVE-2026-103484 (GCVE-0-2026-103484)

Vulnerability from cvelistv5 – Published: 2026-10-01 19:49 – Updated: 2026-10-01 19:58

Title

pgvector buffer overflow in IVFFlat index build

Summary

IVFFlat index build in pgvector before 0.8.7 allows a database user to write data out-of-bounds, which can lead to arbitrary code execution.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/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 2026-10-01 19:58 UTC

CWE

CWE-787 - Out-of-bounds Write
CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

PostgreSQL CNA under the redhat root

CNA scorecard C 67/100 over 88 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/pgvector/pgvector/issues/1036
https://github.com/pgvector/pgvector/commit/ee00d…

Impacted products

1 product

Vendor	Product	Version
n/a	pgvector	Affected: 0 , < 0.8.7 (semver)

Credits

Thanks to Emanuele Barbeno, Cyrill Bannwart, Urs Mueller, and Lukasz D of Compass Security for reporting this.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-103484",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-01T19:58:32.132643Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-01T19:58:48.937Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "pgvector",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "0.8.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "attacker has permission to create an IVFFlat index"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Thanks to Emanuele Barbeno, Cyrill Bannwart, Urs Mueller, and Lukasz D of Compass Security for reporting this."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "IVFFlat index build in pgvector before 0.8.7 allows a database user to write data out-of-bounds, which can lead to arbitrary code execution."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
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        },
        {
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              "description": "Improper Validation of Specified Quantity in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-01T19:49:03.670Z",
        "orgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
        "shortName": "PostgreSQL"
      },
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          "url": "https://github.com/pgvector/pgvector/issues/1036"
        },
        {
          "url": "https://github.com/pgvector/pgvector/commit/ee00d39ab30c2a7cf9510abf9288c624d91db156"
        }
      ],
      "title": "pgvector buffer overflow in IVFFlat index build"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
    "assignerShortName": "PostgreSQL",
    "cveId": "CVE-2026-103484",
    "datePublished": "2026-10-01T19:49:03.670Z",
    "dateReserved": "2026-09-30T16:24:57.108Z",
    "dateUpdated": "2026-10-01T19:58:48.937Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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.
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