Vulnerability details
CVE-2026-86345
Red Hat Directory Server 11Red Hat Directory Server 12Red Hat Directory Server 13Red Hat Enterprise Linux 10Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9
389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result
CVSS 3.1
9.0Critical
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Directory Server 11 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Directory Server 12 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Directory Server 12 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Directory Server 13 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 10 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 8 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 8 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 9 | All | CVEProject cvelistV5 (CNA) |
References and advisories
2- 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
Kolun on Telegram @kolunsec
Exploited CVEs, key news and a daily digest
Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.
Details
- Published
- 2026-10-02
- Last updated
- 2026-11-07
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
0.38%
Probability of exploitation in 30 days
32.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-923Improper Restriction of Communication Channel to Intended Endpoints