CVE-2026-32280

Unexpected work during chain building in crypto/x509

HIGH
7.5
CVSS Score
Published: April 8, 2026 at 01:06 AM UTC
Updated: September 18, 2026 at 01:17 PM UTC
40 products affected across 3 vendorsGoEnterprise LinuxOpenShift Container Platform

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.25.91.26.0 ≤ v < 1.26.2
Affected range stops below 1.25.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.2, so it looks safe — our inference, not a vendor statement
v < 1.25.91.26.0-0 ≤ v < 1.26.21.26.0-0
Affected range stops below 1.25.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.2, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 1780238563 (unaffected)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (198)

Patch
Source: cverecord
https://go.dev/cl/758320
Issue Tracking
Source: cverecord
https://go.dev/issue/78282
Mailing ListRelease Notes
Source: cverecord
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
Vendor Advisory
Source: cverecord
https://pkg.go.dev/vuln/GO-2026-4947
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10217
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10219
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10704
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:11507

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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