Vulnerability-Lookup

GHSA-GCC9-WQF3-69QJ

Vulnerability from github – Published: 2026-01-07 21:31 – Updated: 2026-01-08 18:30

Details

OpenLDAP Lightning Memory-Mapped Database (LMDB) mdb_load contains a heap buffer underflow vulnerability in the readline() function. When processing malformed input, an unsigned offset calculation can underflow a heap pointer, resulting in an out-of-bounds read of one byte before the allocated heap buffer. This may allow a local attacker to cause a denial of service and potentially disclose limited heap memory contents.

Severity

7.0 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22185"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-07T21:16:01Z",
    "severity": "HIGH"
  },
  "details": "OpenLDAP Lightning Memory-Mapped Database (LMDB) mdb_load contains a heap buffer underflow vulnerability in the readline() function. When processing malformed input, an unsigned offset calculation can underflow a heap pointer, resulting in an out-of-bounds read of one byte before the allocated heap buffer. This may allow a local attacker to cause a denial of service and potentially disclose limited heap memory contents.",
  "id": "GHSA-gcc9-wqf3-69qj",
  "modified": "2026-01-08T18:30:43Z",
  "published": "2026-01-07T21:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22185"
    },
    {
      "type": "WEB",
      "url": "https://bugs.openldap.org/show_bug.cgi?id=10421"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2026/Jan/5"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2026/Jan/8"
    },
    {
      "type": "WEB",
      "url": "https://www.openldap.org"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openldap-lmdb-mdb-load-heap-buffer-underflow-in-readline"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-22185 (GCVE-0-2026-22185)

Vulnerability from cvelistv5 – Published: 2026-01-07 20:26 – Updated: 2026-05-25 23:41

Title

OpenLDAP LMDB mdb_load Heap Buffer Underflow in readline()

Summary

OpenLDAP Lightning Memory-Mapped Database (LMDB) versions up to and including 0.9.14, prior to commit 8e1fda8, contain a heap buffer underflow in the readline() function of mdb_load. When processing malformed input containing an embedded NUL byte, an unsigned offset calculation can underflow and cause an out-of-bounds read of one byte before the allocated heap buffer. This can cause mdb_load to crash, leading to a limited denial-of-service condition.

Severity

4.6 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-07 21:25 UTC

CWE

CWE-125 - Out-of-bounds Read
CWE-191 - Integer Underflow (Wrap or Wraparound)

Assigner

VulnCheck mitre root Scorecard

References

5 references

URL	Tags
https://seclists.org/fulldisclosure/2026/Jan/5	technical-descriptionexploit
https://seclists.org/fulldisclosure/2026/Jan/8	technical-descriptionexploit
https://www.openldap.org/	product
https://www.vulncheck.com/advisories/openldap-lmd…	third-party-advisory
https://bugs.openldap.org/show_bug.cgi?id=10421	issue-trackingpatch

Impacted products

1 product

Vendor	Product	Version
OpenLDAP Foundation	OpenLDAP	Affected: 0.9.14 , < 0.9.34 (semver) cpe:2.3:a:openldap:openldap::::::::

Credits

Ron Edgerson

Show details on NVD website

JSON

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  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-22185",
                "options": [
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                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-07T21:25:36.753538Z",
                "version": "2.0.3"
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              "versionType": "semver"
            }
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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.

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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GHSA-GCC9-WQF3-69QJ

CVE-2026-22185 (GCVE-0-2026-22185)

Tags

Sightings

Nomenclature

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