CVE-2026-86345
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 30% of all known CVEs.
References
Related Vulnerabilities
Other CWE-923 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-48999 | High | 8.8 | 10% | - | Fix |
| CVE-2024-24974 | High | 7.5 | 9.8% | - | Fix |
| CVE-2021-38487 | High | 8.2 | 3.4% | - | Fix |
| CVE-2022-2663 | Medium | 5.3 | 3.2% | - | Fix |
| CVE-2019-17440 | Critical | 10.0 | 1.7% | - | - |
| CVE-2021-32635 | Medium | 6.3 | 1.4% | - | - |
Common questions
How do I fix CVE-2026-86345?
No published fix for CVE-2026-86345 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-86345 being actively exploited?
Not that we know of. CVE-2026-86345 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 30% of all scored CVEs.
How severe is CVE-2026-86345?
CVE-2026-86345 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-07.