CVE-2026-78605CWE-444

CVE-2026-78605

Medium · published September 2, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
30.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00377 · 30.5th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-09-02T00:17Z
Affected products (3)
ProductVersionsFixed in
elastic/elasticsearch≥ 8.18.0, < 8.19.208.19.20
elastic/elasticsearch≥ 9.0.0, < 9.4.59.4.5
elastic/elasticsearchall versions—
References (1)
https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-141/390092 · [email protected]
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 19:20Z
    Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in Elasticsearch Leading to Information Disclosure
    cvelistv5