MEDIUM CWE-299
CVE-2026-111943
Distrust compromised intermediate certificates in crypto/x509
Go standard library·crypto/x509
6.8/ 10
CVSS 3.1
Medium severity
0.40%
EPSS exploit odds
Chance of exploitation in the next 30 days
Higher than 34% of all CVEs
Not listed
CISA KEV catalog
No confirmed in-the-wild exploitation on CISA's list.
Timeline
- Published
- Oct 21, 2026
- Updated
- Oct 30, 2026
- First covered
- Oct 21, 2026
- Latest story
- 3 weeks ago
Summary
On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.
CWE-299Improper Check for Certificate Revocation
Attack profile
Attack vectorNetwork
ComplexityHigh
PrivilegesNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:NAffected products
- Go standard library crypto/x509before 1.26.101.27.0-0 to before 1.27.3