Resource exhaustion in Go programming language - CVE-2026-27145

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Main Vulnerability Database Vulnerabilities #VU140620

Resource exhaustion in Go programming language - CVE-2026-27145

Published: July 31, 2026


Vulnerability identifier: #VU140620
CSH Severity: Medium
CVSS v4 BT: 6.6 [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/E:U/U:Green]
CVE-ID: CVE-2026-27145
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 crypto/x509 certificate hostname verification when processing certificates with a large DNS subject alternative name list. A remote attacker can present a specially crafted certificate to cause a denial of service.

The excessive verification cost occurs before the certificate chain is built, so the overhead is incurred even for untrusted certificates.


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 High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 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
Fedora
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Development Tools Module
openSUSE Leap
Anolis OS
rhc-worker-playbook (Red Hat package)
golang-github-openprinting-ipp-usb (Red Hat package)
golang-github-openprinting-ipp-usb
ipp-usb
kind
go-fdo-client (Red Hat package)
spoofdpi
betterleaks
node-exporter
skopeo
go1.25-doc
go1.25
go1.25-race
go1.25-openssl
go1.25-openssl-doc
go1.25-openssl-debuginfo
go1.25-openssl-race
go1.26
go1.26-doc
go1.26-race
golang
golang-bin
golang-shared
golang-docs
golang-misc
golang-src
golang-tests
go1.26-openssl
go1.26-openssl-race
go1.26-openssl-doc

How to mitigate CVE-2026-27145

Install security update from vendor's website.

Go programming language - addressed in versions 1.25.11, 1.26.4
rhc-worker-playbook (Red Hat package) - update to 0.2.10-1.el10_2
golang-github-openprinting-ipp-usb (Red Hat package) - update to 0.9.27-7.el10_2.2
golang-github-openprinting-ipp-usb - update to 0.9.34-1.fc43
ipp-usb - update to 0.9.34-2.fc44
kind - update to 0.31.0-4.fc45
go-fdo-client (Red Hat package) - update to 1.0.0-4.el10_2.5
spoofdpi - addressed in versions 1.5.3-1.el9, 1.5.3-1.el10_3, 1.5.3-1.fc44, 1.5.3-1.fc45
betterleaks - addressed in versions 1.6.0-1.el9, 1.6.0-1.el10_2, 1.6.0-1.el10_3, 1.6.0-1.fc43, 1.6.0-1.fc44, 1.7.0-2.el9, 1.7.0-2.el10_2, 1.7.0-2.el10_3
node-exporter - addressed in versions 1.12.0-1.el9, 1.12.0-1.el10_2, 1.12.0-1.el10_3, 1.12.0-1.fc43, 1.12.0-1.fc44, 1.12.1-1.el9, 1.12.1-1.el10_2, 1.12.1-1.fc43, 1.12.1-1.fc44
skopeo - addressed in versions 1.22.2-2.fc43, 1.22.2-2.fc44
go1.25-doc - update to 1.25.11-150000.1.41.1
go1.25 - update to 1.25.11-150000.1.41.1
go1.25-race - update to 1.25.11-150000.1.41.1
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
go1.25-openssl-debuginfo - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.25-openssl-race - addressed in versions 1.25.12-150000.1.27.1, 1.25.12-150600.13.21.1
go1.26 - update to 1.26.4-150000.1.15.1
go1.26-doc - update to 1.26.4-150000.1.15.1
go1.26-race - update to 1.26.4-150000.1.15.1
golang - update to 1.26.5-1
golang-bin - update to 1.26.5-1
golang-shared - update to 1.26.5-1
golang-docs - update to 1.26.5-1
golang-misc - update to 1.26.5-1
golang-src - update to 1.26.5-1
golang-tests - update to 1.26.5-1
go1.26-openssl - 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-doc - addressed in versions 1.26.5-150000.1.12.1, 1.26.5-150600.13.9.1

External References

Related Security Bulletins