High severity · published Apr 8, 2026
CVE-2026-32280
Unexpected work during chain building in crypto/x509
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CR
crypto/x509 · Go standard library
before 1.25.9; 1.26.0-0 before 1.26.2 · source: vendor
GO
GO · Golang
before 1.25.9; 1.26.0 before 1.26.2 · source: NVD
CO
Compliance Operator 1 · Red Hat
All versions, or not specified · source: CISA
C4
Cryostat 4 on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
CM
Custom Metric Autoscaler 2.19 · Red Hat
All versions, or not specified · source: CISA
HH
HawtIO HawtIO 4.4.0 · Red Hat
All versions, or not specified · source: CISA
LS
Logging Subsystem for Red Hat OpenShift 6.4 · Red Hat
All versions, or not specified · source: CISA
LF
Logging for Red Hat OpenShift 6 · Red Hat
All versions, or not specified · source: CISA
LF
Logging for Red Hat OpenShift 6.2 · Red Hat
All versions, or not specified · source: CISA
MG
Multicluster Global Hub 1.4.5 · Red Hat
All versions, or not specified · source: CISA
MG
Multicluster Global Hub 1.6.5 · Red Hat
All versions, or not specified · source: CISA
NO
Network Observability (NETOBSERV) 1.11.0 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32280
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-32280
Patch
https://go.dev/cl/758320
Issue Tracking
https://go.dev/issue/78282
Mailing List
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-4947
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:10217
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:10219
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