CVE-2026-78605

5.9 mediumEPSS 0.3%

Medium (5.9) in elastic elasticsearch. EPSS 0.3% chance of exploitation in the next 30 days.

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') (CWE-444) in Elasticsearch can lead to information disclosure via HTTP Request Smuggling (CAPEC-33). Under specific proxy deployment configurations, a network attacker could obtain confidential responses intended for other authenticated users.

Severity

CVSS 3.1

5.9 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
CWE: CWE-444
Published: 2026-09-01
Modified: 2026-09-02
Record from: the NVD, synced 2026-10-19

Affected

elastic:elasticsearch

References

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-141/390092

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