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Red Hat · Security advisory · May 27, 2026
Red Hat · Security advisory · May 27, 2026RHSA-2026:49702: golang security update
RHSA-2026:49702, released May 27, 2026, fixes 16 CVEs in golang (version 1.26.5-1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
16
1 rated Critical
Exploited
0
None reported
Highest CVSS
10.0
Base score, 0 to 10
Highest EPSS
0.0183
79th percentile
Priority of the 16 CVEs
Patch now 0
Urgent 1
High 14
Routine 1
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| golang | RHEL 10 | 1.26.5-1.el10_0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-39821 | Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna | 10.0 | 0.0183 | None reported |
| High | CVE-2026-33811 | Crash when handling long CNAME response in net | 8.8 | 0.0088 | None reported |
| High | CVE-2026-33814 | Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net | 7.5 | 0.0084 | None reported |
| High | CVE-2026-42499 | Quadratic string concatenation in consumePhrase in net/mail | 8.8 | 0.0080 | None reported |
| High | CVE-2026-39820 | Quadratic string concatentation in consumeComment in net/mail | 8.8 | 0.0078 | None reported |
| High | CVE-2026-27137 | Incorrect enforcement of email constraints in crypto/x509 | 9.1 | 0.0066 | None reported |
| High | CVE-2026-27145 | Inefficient candidate hostname parsing in crypto/x509 | 8.2 | 0.0059 | None reported |
| High | CVE-2026-39825 | ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil | 7.5 | 0.0039 | None reported |
| High | CVE-2026-39826 | Escaper bypass leads to XSS in html/template | 7.5 | 0.0037 | None reported |
| High | CVE-2026-33810 | Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509 | 9.1 | 0.0035 | None reported |
| High | CVE-2026-39823 | Bypass of meta content URL escaping causes XSS in html/template | 7.5 | 0.0031 | None reported |
| High | CVE-2026-39822 | Root escape via symlink plus trailing slash in os | 8.2 | 0.0023 | None reported |
| High | CVE-2026-42501 | Malicious module proxy can bypass checksum database in cmd/go | 7.5 | 0.0023 | None reported |
| High | CVE-2026-39819 | Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go | 7.5 | 0.0018 | None reported |
| High | CVE-2026-39817 | Invoking "go tool pack" does not sanitize output paths in cmd/go | 7.5 | 0.0017 | None reported |
| Routine | CVE-2026-42507 | Arbitrary inputs are included in errors without any escaping in net/textproto | 5.3 | 0.0037 | None reported |
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