CVE-2026-15911Confluent Kafka Python Improper TLS Certificate Validation
- 7.4HighCVSS base score
- 0.30%Exploitation in 30 daysEPSS · top 77% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation.
Timeline
ID reserved
By ibm
- 3 months later
· 3 months later
Published
- 5 days later
· 5 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ibmCNA (assigner) | 3.1 | High7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | High7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.30% · top 77% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
- affected ≤ 2.14.2
What to do
Solution: * confluent-kafka (Python): This issue has been addressed in confluent-kafka (Python) 2.15.0, which: * Enables TLS certificate verification by default. * Exposes configuration to supply a custom CA bundle and an optional client certificate for mutual TLS, through both driver configuration and standard Vault environment variables: * ssl.ca.location (or environment variable VAULT_CACERT): CA bundle used to verify the Vault server certificate. * ssl.certificate.location (or environment variable VAULT_CLIENT_CERT): client certificate for mutual TLS. * ssl.key.location (or environment variable VAULT_CLIENT_KEY): client private key for mutual TLS. * An empty or unset CA value keeps verification enabled; it does not silently disable verification. * Confluent Platform: Not affected. The vulnerability resides in the confluent-kafka Python client library and does not affect Confluent Platform server components or their released versions. * Confluent Cloud: Not affected. No remediation is required for Confluent Cloud.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-91008 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-15911)Record last updated .