Red Hat Security Advisory: golang security, bug fix, and enhancement update
Affects Red Hat golang security,Source GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 9.6 Critical · fixed in Red Hat package updates : patch Red Hat http as a priority.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 1.8% chance of exploitation in 30 days – higher than 78% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.27.0-rc.3, 1.26.6, 1.25.13 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 22 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade net/http and net/http/internal/http2 to 1.27.0-rc.3, 1.26.6 or 1.25.13; golang.org/x/net/idna to 0.55.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Go standard librarynet/http | Affected
| Fixed in
|
| Go standard librarynet/http | Affected
| Fixed in
|
| Go standard librarynet/http | Affected
| Fixed in
|
| Go standard librarynet/http/internal/http2 | Affected
| Fixed in
|
| Go standard librarynet/http/internal/http2 | Affected
| Fixed in
|
| Go standard librarynet/http/internal/http2 | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The golang packages provide the Go programming language compiler. Security Fix(es): * golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * os: golang: Go os.Root: Symlink following vulnerability allows directory traversal (CVE-2026-39822) Bug Fix(es) and Enhancement(s): * Update Go to version 1.26.5+1 [rhel-9.8.z] (JIRA:RHEL-193476) 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.
References
- access.redhat.com/errata/RHSA-2026:37435 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2480756 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2498152 (opens in a new tab)
- issues.redhat.com/browse/RHEL-193476 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_37435.json (opens in a new tab)