9.1

CVE-2026-71290: apache software foundation apache httpcomponents client Improper Certificate Validation

CVSS: 9.1v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-71290DEBIAN-CVE-2026-71290CGA-4cgx-hw2j-phw7
Published 11-08-2026Last modified 24-09-2026
Open JSON

Vulnerability summary

CVE-2026-71290 is a critical (CVSS 9.1) Improper Certificate Validation vulnerability in apache software foundation apache httpcomponents client. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-08-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

+0.09 pp

From 0.24% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard3 products
  • logstash-8.19< 8.19.21-r2
  • logstash-8.19-iamguarded-compat< 8.19.21-r2
  • logstash-8.19-with-output-opensearch< 8.19.21-r2
Apache1 product
Apache software foundation1 product
Debian1 product
  • httpcomponents-core5All versions (No fix recorded)
Ubuntu1 product
  • httpcomponents-core5All versions (No fix recorded)

5 vendors · 7 products

References

5 links