CVE-2026-71290

EUVD-2026-56973

11.08.2026, 21:17

Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain.

Please note the classic version of HttpClient is not affected by this vulnerability.

Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	9.1 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 23.57%

Affected Products (NVD)

Vendor	Product	Version
apache	httpclient	5.4 ≤ 𝑥 < 5.6.4

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

httpcomponents-client

bookworm	4.5.14-1 fixed
forky	4.5.14-1 fixed
sid	4.5.14-1 fixed
trixie	4.5.14-1 fixed

httpcomponents-core5

bookworm	5.2.1-1 fixed
forky	vulnerable
sid	vulnerable
trixie	5.2.2-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

httpcomponents-core5

jammy	needs-triage
noble	needs-triage
resolute	needs-triage

Common Weakness Enumeration

CWE-295 - Improper Certificate Validation
The software does not validate, or incorrectly validates, a certificate.

Vulnerability Media Exposure

[GERMAN] Oracle Communications: Mehrere Schwachstellen
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.
Published: 2026-09-15T22:00:00+00:00

References

https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq

http://www.openwall.com/lists/oss-security/2026/08/13/6