Vulnerability-Lookup

UBUNTU-CVE-2026-86345 (CVE-2026-86345)

Vulnerability from osv_ubuntu – Published: 2026-10-02 00:17 – Updated: 2026-10-17 09:54 – Source website

Details

A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.

Severity

9.0 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-86345	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-86345	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2529332	REPORT
	https://access.redhat.com/security/cve/CVE-2026-86345	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
            "binary_version": "1.3.4.9-1ubuntu0.1~esm1"
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          {
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            "binary_version": "1.3.4.9-1ubuntu0.1~esm1"
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          {
            "binary_name": "389-ds-base-libs",
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      },
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      ],
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    },
    {
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          {
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            "binary_version": "1.3.7.10-1ubuntu1+esm1"
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          {
            "binary_name": "389-ds-base",
            "binary_version": "1.3.7.10-1ubuntu1+esm1"
          },
          {
            "binary_name": "389-ds-base-libs",
            "binary_version": "1.3.7.10-1ubuntu1+esm1"
          },
          {
            "binary_name": "python3-dirsrvtests",
            "binary_version": "1.3.7.10-1ubuntu1+esm1"
          },
          {
            "binary_name": "python3-lib389",
            "binary_version": "1.3.7.10-1ubuntu1+esm1"
          }
        ]
      },
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        "name": "389-ds-base",
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        "1.3.7.10-1",
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
            "binary_version": "1.4.3.6-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "389-ds-base",
            "binary_version": "1.4.3.6-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "389-ds-base-libs",
            "binary_version": "1.4.3.6-2ubuntu0.1~esm1"
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      ],
      "versions": [
        "1.4.1.6-4",
        "1.4.1.6-4build1",
        "1.4.2.4-1",
        "1.4.2.4-1build1",
        "1.4.3.2-1",
        "1.4.3.2-1build1",
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        "1.4.3.6-2ubuntu0.1~esm1"
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
            "binary_version": "2.0.15-1ubuntu2"
          },
          {
            "binary_name": "389-ds-base",
            "binary_version": "2.0.15-1ubuntu2"
          },
          {
            "binary_name": "389-ds-base-libs",
            "binary_version": "2.0.15-1ubuntu2"
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          {
            "binary_name": "cockpit-389-ds",
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            "binary_name": "python3-lib389",
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      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
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          },
          {
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            "binary_version": "2.4.5+dfsg1-1"
          },
          {
            "binary_name": "389-ds-base-libs",
            "binary_version": "2.4.5+dfsg1-1"
          },
          {
            "binary_name": "cockpit-389-ds",
            "binary_version": "2.4.5+dfsg1-1"
          },
          {
            "binary_name": "python3-lib389",
            "binary_version": "2.4.5+dfsg1-1"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "389-ds-base",
        "purl": "pkg:deb/ubuntu/389-ds-base@2.4.5+dfsg1-1?arch=source\u0026distro=noble"
      },
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        "2.4.4+dfsg1-1ubuntu1",
        "2.4.4+dfsg1-1ubuntu4",
        "2.4.4+dfsg1-3",
        "2.4.5+dfsg1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
            "binary_version": "3.3.1-3"
          },
          {
            "binary_name": "389-ds-base",
            "binary_version": "3.3.1-3"
          },
          {
            "binary_name": "389-ds-base-libs",
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          },
          {
            "binary_name": "cockpit-389-ds",
            "binary_version": "3.3.1-3"
          },
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          }
        ]
      },
      "package": {
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        "purl": "pkg:deb/ubuntu/389-ds-base@3.3.1-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
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            {
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          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "3.1.2+vendor1-2",
        "3.1.2+vendor1-2build1",
        "3.3.1-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "389-ds",
            "binary_version": "3.1.2+vendor1-2"
          },
          {
            "binary_name": "389-ds-base",
            "binary_version": "3.1.2+vendor1-2"
          },
          {
            "binary_name": "389-ds-base-libs",
            "binary_version": "3.1.2+vendor1-2"
          },
          {
            "binary_name": "cockpit-389-ds",
            "binary_version": "3.1.2+vendor1-2"
          },
          {
            "binary_name": "python3-lib389",
            "binary_version": "3.1.2+vendor1-2"
          }
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      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "389-ds-base",
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      },
      "ranges": [
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            {
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      ],
      "versions": [
        "3.1.2+dfsg1-1",
        "3.1.2+vendor1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client\u0027s own pending operation\u0027s response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.",
  "id": "UBUNTU-CVE-2026-86345",
  "modified": "2026-10-17T09:54:14Z",
  "published": "2026-10-02T00:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86345"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-86345"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2529332"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-86345"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-86345"
  ]
}

CVE-2026-86345 (GCVE-0-2026-86345)

Vulnerability from cvelistv5 – Published: 2026-10-01 23:27 – Updated: 2026-10-07 20:19

Title

389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result

Summary

Severity

9 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-07 20:18 UTC

CWE

CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1046 records in the last 180 days details

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-86345	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529332	issue-trackingx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
Red Hat	Red Hat Directory Server 11	cpe:/a:redhat:directory_server:11
Red Hat	Red Hat Directory Server 12	cpe:/a:redhat:directory_server:12
Red Hat	Red Hat Directory Server 13	cpe:/a:redhat:directory_server:13
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-10-01 00:00

Credits

Red Hat would like to thank xclow3n for reporting this issue.

Show details on NVD website

JSON

To clipboard

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                "role": "CISA Coordinator",
                "timestamp": "2026-10-07T20:18:37.184325Z",
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  },
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}

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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