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High 7.5Published Mar 6, 2026

CVE-2026-27137Incorrect enforcement of email constraints in crypto/x509

Updated under an hour ago ()

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It affects Go standard library crypto/x509 and 59 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.

CVSS
7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-295
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
Go
NVD analysis
Modified
Record last updated
Sep 18, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
Go standard library crypto/x509
go_standard_library:crypto_x509 (from the name)
from 1.26.0-0 before 1.26.1
CNA record
from 0:0.2.3-4.el10_1 not affected; from 0:0.2.7-3.el10_2 not affected
CISA ADP
from 0:0.2.3-4.el10_0 not affected
CISA ADP
from 0:1.26.5-1.el9_2 not affected
CISA ADP
from 6:0.8.5-2.el9_6.2 not affected
CISA ADP
from 0:0.2.1-1.1.el8ost not affected
CISA ADP
Red Hat RHEM 1.0 for RHEL 9
redhat:edge_manager
from 0:1.0.3-1.el9em not affected
CISA ADP
from 1774334066 not affected
CISA ADP
from 1776457293 not affected
CISA ADP
from 1781192891 not affected
CISA ADP

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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