Apache HttpComponents Client up to 5.6.3 Async HttpClient HostnameVerificationPolicy#BUILTIN certificate validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.6$0-$5k0.40

Summaryinfo

A vulnerability was found in Apache HttpComponents Client up to 5.6.3. It has been declared as problematic. This affects the function HostnameVerificationPolicy#BUILTIN of the component Async HttpClient. The manipulation results in certificate validation. This vulnerability is reported as CVE-2026-71290. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Apache HttpComponents Client up to 5.6.3. Affected is the function HostnameVerificationPolicy#BUILTIN of the component Async HttpClient. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at lists.apache.org. This vulnerability is traded as CVE-2026-71290 since 08/05/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/11/2026). The MITRE ATT&CK project declares the attack technique as T1587.003.

Upgrading to version 5.6.4 eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HttpComponents Client 5.6.4

Timelineinfo

08/05/2026 CVE reserved
08/11/2026 +6 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/11/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2026-71290 (🔒)
GCVE (CVE): GCVE-0-2026-71290
GCVE (VulDB): GCVE-100-388632

Entryinfo

Created: 08/11/2026 22:58
Changes: 08/11/2026 22:58 (55)
Complete: 🔍
Cache ID: 216::103

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