CVE-2026-40542

HIGH

7.3

CVSS v3

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-304 CWE-325

How to fix

Remediation Available

registry.redhat.io/ocp-toolsRocky

Fixed in:4/jenkins-rhel9@sha256:0a038ab72bea1f2570f20b4c3a91fdf02a45592bdd9f8262172813cca34033d6_amd64RHSA-2026:60251

Fixed in:4/jenkins-rhel9@sha256:d31294d03ca7f688563c7e3840d0aeabbd66779c67861e05fa5b114d945f9266_ppc64leRHSA-2026:60250

Fixed in:4/jenkins-rhel9@sha256:6c5b65b54d8f92d0d82cb23710764f01c4a2e25109a598dbe8626166483b7879_s390xRHSA-2026:60256

Fixed in:4/jenkins-rhel9@sha256:aefa004885cff2364970e66a5c0d7afb8ad76eb107320136256ef564aed71da1_arm64RHSA-2026:60246

Fixed in:4/jenkins-rhel8@sha256:40d8b88bbe9099090a13ed3b8c90ad81667e7cd7bfa3913b00ab59149ed79ac9_ppc64leRHSA-2026:60239

Fixed in:4/jenkins-rhel8@sha256:8e233835f50fa220f239f725680ed652db47107ce05850c6c42ea85c24795e98_amd64RHSA-2026:60248

Fixed in:4/jenkins-rhel8@sha256:df06db520f7e03e268af43ce242923a48890ebe25926b3d3995babe722cdaf20_s390xRHSA-2026:60248

Fixed in:4/jenkins-rhel8@sha256:1a2dc4181e1d7843b562548bc136407baa4ddb00b0722d3bf0b9a680e0bf49a5_ppc64leRHSA-2026:60248

registry.redhat.io/ocp-toolsRed Hat / RHEL

Fixed in:4/jenkins-rhel8@sha256:8e233835f50fa220f239f725680ed652db47107ce05850c6c42ea85c24795e98_amd64RHSA-2026:60248

Fixed in:4/jenkins-rhel9@sha256:d31294d03ca7f688563c7e3840d0aeabbd66779c67861e05fa5b114d945f9266_ppc64leRHSA-2026:60250

Fixed in:4/jenkins-rhel9@sha256:8fee81e34809617638119659d92a5969ee90b520ba5b864d8bd87cc4b94c01ce_arm64RHSA-2026:60252

Fixed in:4/jenkins-rhel9@sha256:83699a96de9627cb0164bf9ae31d3d3537c93b41a72c2ce3bf1ff96a56d3f341_arm64RHSA-2026:60251

Fixed in:4/jenkins-rhel9@sha256:a01210c1f2794b2a85fb434b3e9f054b06504c7b36eb1e6fb7665c1a6b2dc7c9_amd64RHSA-2026:60254

Fixed in:4/jenkins-rhel8@sha256:5d5328ff56d7cff72402a1475c5aded6a3fbb76d283075a00d1083ea2a58037a_amd64RHSA-2026:60239

Fixed in:4/jenkins-rhel9@sha256:aefa004885cff2364970e66a5c0d7afb8ad76eb107320136256ef564aed71da1_arm64RHSA-2026:60246

Fixed in:4/jenkins-rhel9@sha256:0a038ab72bea1f2570f20b4c3a91fdf02a45592bdd9f8262172813cca34033d6_amd64RHSA-2026:60251

registry.redhat.io/ocp-tools-4/jenkins-agentRed Hat / RHEL

Fixed in:base-rhel9@sha256:a0956de91f8c036ea551e27c15af3cdd0bfe6f61abf6240d1a7abdd62a2d0582_arm64RHSA-2026:60252

Fixed in:base-rhel8@sha256:8c7d22928f2b2826dc175b512fd3729235f4e04856124be04992f61294445e76_s390xRHSA-2026:60248

Fixed in:base-rhel9@sha256:3c558027583ae06bcf6044a086ffdf9eba15c8dd2469efd2fc8c6287888f8659_amd64RHSA-2026:60256

Fixed in:base-rhel9@sha256:d455d962d6a5735999d2b38c4d5cd178ca62da7d0cb337162990c5c092724d8c_arm64RHSA-2026:60250

Fixed in:base-rhel9@sha256:7080500c199cec5ab404d643ad4c379e08cf11b4bbad959c8a5b8ce35ff5e78f_amd64RHSA-2026:60259

Fixed in:base-rhel9@sha256:cb89d8060e5ae3e623c6dcbd27a2b9454df637e91f1dd537720174a33eb119f8_amd64RHSA-2026:60251

Fixed in:base-rhel9@sha256:43515966cc3d08789e580d7e1a30388895fc56c2831e8cac7350d2c4799c97e6_arm64RHSA-2026:60256

Fixed in:base-rhel8@sha256:9a4306c79b02caa28e3ebde184e1bfefcc42e4ce770f2f710af47f1085721cd8_ppc64leRHSA-2026:60248

registry.redhat.io/ocp-tools-4/jenkins-agentRocky

Fixed in:base-rhel8@sha256:36406057b4fe044790d32444074185844227d5f92b8611efa5cb0c01cc537f0d_arm64RHSA-2026:60239

Fixed in:base-rhel9@sha256:a0956de91f8c036ea551e27c15af3cdd0bfe6f61abf6240d1a7abdd62a2d0582_arm64RHSA-2026:60252

Fixed in:base-rhel9@sha256:ff3b99e18e5371592f54fbfadf04cac8de3a9355a0eb5c759c53c67fbf972033_s390xRHSA-2026:60250

Fixed in:base-rhel9@sha256:325087ceeaf4861b3118181f1745771c92e8828797621c804197d6f0167e0e91_ppc64leRHSA-2026:60259

Fixed in:base-rhel9@sha256:5e9f7b1c88e63987515064812b722d669b637eeb97391b52d2bd56ce0ac68c85_amd64RHSA-2026:60252

Fixed in:base-rhel8@sha256:8c7d22928f2b2826dc175b512fd3729235f4e04856124be04992f61294445e76_s390xRHSA-2026:60248

Fixed in:base-rhel9@sha256:a0a915479ad2a784bbbd1cbbef51ca1a69a37b7c9f496cbb53182802e085bd3d_amd64RHSA-2026:60246

Fixed in:base-rhel9@sha256:804f625349f4ac1250e04d806b44883a8beac175fb0ddfd042a5ac8c222c276f_ppc64leRHSA-2026:60251

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.56%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Other references14

Related Vulnerabilities

Other CWE-304 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-55957	High	7.3	2.9%	-	Fix
CVE-2022-1065	High	8.1	2.8%	-	Fix
CVE-2022-2302	Critical	9.8	1.9%	-	Fix
CVE-2024-2172	Critical	9.8	1.7%	-	-
CVE-2019-16766	High	8.7	1.5%	-	Fix
CVE-2022-2821	High	7.5	1.3%	-	Fix

Common questions

How do I fix CVE-2026-40542?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-40542 being actively exploited?

Not that we know of. CVE-2026-40542 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.56% is the estimated probability that it will be exploited in the next 30 days. That is higher than 44% of all scored CVEs.

How severe is CVE-2026-40542?

CVE-2026-40542 has a CVSS v3 base score of 7.3, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-40542 affect?

Published advisories record a fix for registry.redhat.io/ocp-tools (Rocky), registry.redhat.io/ocp-tools (Red Hat / RHEL), registry.redhat.io/ocp-tools-4/jenkins-agent (Red Hat / RHEL), registry.redhat.io/ocp-tools-4/jenkins-agent (Rocky). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-27.