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CVE-2026-40542 Apache HttpClient

Affected softwareApache HttpClient
Severity7.3 High CVSS 3.1 2 scores
Fixed in5.6.1
WeaknessCWE-304
Published22 Apr 2026
Updated26 Oct 2026

Description

Missing critical step in authentication in Apache HttpClient 5.6 allows an attacker to cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification. Users are recommended to upgrade to version 5.6.1, which fixes this issue.

CWE-325

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.54% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/httpcomponents-client 726eac2.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2460518 : a Red Hat bug: the triage, which links onward to the fix

CVSS

7.3 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.3 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CISA-ADP Secondary published
CVSS 3.1 7.3 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L redhat-SADP Secondary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Siebel CRM / Server Infrastructure (Apache HttpClient) (17.0-26.8)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Siebel CRM Server Infrastructure (Apache HttpClient) 17.0-26.8

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.httpcomponents.client5:httpclient5 5.6-alpha1 5.6.1 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd apache httpclient generic 5.6
osv org.apache.httpcomponents.client5 httpclient5 generic ≥ 5.6 and < 5.6.1

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2460518 bugzilla
https://github.com/apache/httpcomponents-client/commit/726eac2323d370435d8afca1e0540aa099927f18 WEB
https://github.com/apache/httpcomponents-client PACKAGE
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 WEB
http://www.openwall.com/lists/oss-security/2026/04/22/5 WEB
https://access.redhat.com/errata/RHSA-2026:60239
https://access.redhat.com/errata/RHSA-2026:60246
https://access.redhat.com/errata/RHSA-2026:60247
https://access.redhat.com/errata/RHSA-2026:60248
https://access.redhat.com/errata/RHSA-2026:60249

Timeline

Published2026-04-22By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.