RHSA-2026:49712 — Security Advisory

Red Hat Security Advisory: golang security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · August 4, 2026

Updated · November 5, 2026

Topic

An update for golang is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The golang packages provide the Go programming language compiler.

Security Fix(es):

net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
cmd/go: golang: Go command (cmd/go): Integrity bypass due to checksum validation flaw via malicious module proxy (CVE-2026-42501)
html/template: golang: Go html/template: Cross-Site Scripting via improper URL escaping in meta tag content (CVE-2026-39823)
cmd/go: golang: Go 'go bug' command: Arbitrary file overwrite via symlink attack (CVE-2026-39819)
net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame (CVE-2026-33814)
net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)
net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)
net/http/httputil: golang: net/http/httputil: ReverseProxy forwards hidden query parameters, potentially bypassing security controls (CVE-2026-39825)
cmd/go: golang: Go tool pack: Arbitrary file write via malicious archive extraction (CVE-2026-39817)
html/template: golang: html/template: Cross-site scripting due to incorrect script tag escaping (CVE-2026-39826)
golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
net/textproto: golang: Golang net/textproto: Misleading error messages via input injection (CVE-2026-42507)
crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145)
os: golang: Go os.Root: Symlink following vulnerability allows directory traversal (CVE-2026-39822)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.