Resource exhaustion in Go programming language - CVE-2026-42504

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Main Vulnerability Database Vulnerabilities #VU140619

Resource exhaustion in Go programming language - CVE-2026-42504

Published: July 31, 2026


Vulnerability identifier: #VU140619
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42504
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in WordDecoder.DecodeHeader in the mime package when parsing a maliciously crafted MIME header containing many invalid encoded-words. A remote attacker can send a specially crafted MIME header to cause a denial of service.


Affected software

Go programming language
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Development Tools Module
openSUSE Leap
golang-github-openprinting-ipp-usb (Red Hat package)
butane (Red Hat package)
runc (Red Hat package)
containernetworking-plugins (Red Hat package)
skopeo (Red Hat package)
go1.25-race
go1.25
go1.25-doc
go1.25-openssl-race
go1.25-openssl-debuginfo
go1.25-openssl
go1.25-openssl-doc
go1.26-race
go1.26-doc
go1.26
go1.26-openssl-doc
go1.26-openssl-race
go1.26-openssl
cri-tools (Red Hat package)
cri-o (Red Hat package)
ignition (Red Hat package)
kata-containers (Red Hat package)
ose-gcp-gcr-image-credential-provider (Red Hat package)
ose-azure-acr-image-credential-provider (Red Hat package)
ose-aws-ecr-image-credential-provider (Red Hat package)
openshift-clients (Red Hat package)
openshift (Red Hat package)
grafana-pcp (Red Hat package)
podman (Red Hat package)
Red Hat Advanced Cluster Security for Kubernetes
Red Hat OpenShift Container Platform

How to mitigate CVE-2026-42504

Install security update from vendor's website.

Go programming language - addressed in versions 1.25.11, 1.26.4
golang-github-openprinting-ipp-usb (Red Hat package) - update to 0.9.27-7.el10_2.3
butane (Red Hat package) - addressed in versions 0.23.0-5.rhaos4.18.el8, 0.26.0-3.rhaos4.21.el8
runc (Red Hat package) - addressed in versions 1.2.9-4.rhaos4.21.el9, 1.2.9-7.rhaos4.18.el8, 1.2.9-7.rhaos4.18.el9
containernetworking-plugins (Red Hat package) - update to 1.4.0-10.rhaos4.18.el8
skopeo (Red Hat package) - addressed in versions 1.16.1-6.rhaos4.18.el8, 1.16.1-7.rhaos4.18.el9
go1.25-race - update to 1.25.11-150000.1.41.1
go1.25 - update to 1.25.11-150000.1.41.1
go1.25-doc - update to 1.25.11-150000.1.41.1
go1.25-openssl-race - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.25-openssl-debuginfo - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.25-openssl - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.25-openssl-doc - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.26-race - update to 1.26.4-150000.1.15.1
go1.26-doc - update to 1.26.4-150000.1.15.1
go1.26 - update to 1.26.4-150000.1.15.1
go1.26-openssl-doc - addressed in versions 1.26.5-150000.1.12.1, 1.26.5-150600.13.9.1
go1.26-openssl-race - addressed in versions 1.26.5-150000.1.12.1, 1.26.5-150600.13.9.1
go1.26-openssl - addressed in versions 1.26.5-150000.1.12.1, 1.26.5-150600.13.9.1
cri-tools (Red Hat package) - addressed in versions 1.31.1-7.el8, 1.31.1-7.el9, 1.34.0-5.el9
cri-o (Red Hat package) - addressed in versions 1.31.13-11.rhaos4.18.git817a650.el9, 1.31.13-12.rhaos4.18.git249255c.el8
ignition (Red Hat package) - update to 2.18.0-11.rhaos4.18.el9
kata-containers (Red Hat package) - update to 3.31.0-5.rhaos4.19.el9
Red Hat Advanced Cluster Security for Kubernetes - update to 4.11.2
ose-gcp-gcr-image-credential-provider (Red Hat package) - addressed in versions 4.18.0-202608121933.p2.g6ea2356.assembly.stream.el8, 4.18.0-202608121933.p2.g6ea2356.assembly.stream.el9, 4.21.0-202608132049.p2.ge27acce.assembly.stream.el8, 4.21.0-202608132049.p2.ge27acce.assembly.stream.el9
ose-azure-acr-image-credential-provider (Red Hat package) - addressed in versions 4.18.0-202608121933.p2.g9795abd.assembly.stream.el8, 4.18.0-202608121933.p2.g9795abd.assembly.stream.el9, 4.21.0-202608132049.p2.gc9afac2.assembly.stream.el8, 4.21.0-202608132049.p2.gc9afac2.assembly.stream.el9
ose-aws-ecr-image-credential-provider (Red Hat package) - addressed in versions 4.18.0-202608121933.p2.gc395190.assembly.stream.el8, 4.18.0-202608121933.p2.gc395190.assembly.stream.el9, 4.21.0-202608132049.p2.gfdc7f3f.assembly.stream.el8, 4.21.0-202608132049.p2.gfdc7f3f.assembly.stream.el9
openshift-clients (Red Hat package) - addressed in versions 4.18.0-202608132034.p2.g6febe61.assembly.stream.el8, 4.18.0-202608132034.p2.g6febe61.assembly.stream.el9, 4.21.0-202608132049.p2.g0aac049.assembly.stream.el8, 4.21.0-202608132049.p2.g0aac049.assembly.stream.el9
openshift (Red Hat package) - addressed in versions 4.18.0-202608132034.p2.g91c2408.assembly.stream.el8, 4.18.0-202608132034.p2.g91c2408.assembly.stream.el9, 4.21.0-202608140338.p2.g7ffd39d.assembly.stream.el8, 4.21.0-202608140338.p2.g7ffd39d.assembly.stream.el9
Red Hat OpenShift Container Platform - addressed in versions 4.18.54, 4.21.30
grafana-pcp (Red Hat package) - update to 5.1.1-18.el8_10
podman (Red Hat package) - update to 5.4.0-16.rhaos4.21.el9

External References

Related Security Bulletins