Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-71290
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-11 21:17:51 UTC
Updated2026-08-13 17:17:34 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

EPSS: 0.001550000 probability, percentile 0.052030000 (date 2026-08-13)

Problem Types: CWE-295 | CWE-295 CWE-295 Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache HttpComponents Client affected 5.4-alpha 5.6.3 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/08/13/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: n0mi1k (en)

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