Red Hat Security Advisory: go-toolset:rhel8 security update
Affects Red Hat go-toolset:rhel8Source GCVE Database
Not known to be exploited · CVSS 6.8 Medium : upgrade Red Hat x509 to 1.27.3 or 1.26.10 when convenient.
Data as of 6 Nov 2026, 11:23 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 6.8 |
|---|
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.27.3, 1.26.10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 21 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 2026.
What to do
Upgrade crypto/x509 to 1.27.3 or 1.26.10.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Go standard librarycrypto/x509 | Affected
| Fixed in
|
| Go standard librarycrypto/x509 | Affected
| Fixed in
|
Gocrypto/x509pkg:golang/crypto/x509Other threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released an official security update for the go-toolset:rhel8 module that addresses this vulnerability. Users should apply the update as described in the Red Hat advisory (RHSA-2026:95638) and the referenced article (https://access.redhat.com/articles/11258) to remediate the issue. No additional mitigation steps are indicated beyond applying the official patch.
Description
A security update for the Go Toolset in Red Hat Enterprise Linux 8 addresses a vulnerability in the crypto/x509 package that allows man-in-the-middle attacks via untrusted intermediate certificates. This vulnerability is tracked as CVE-2026-111943 and has been rated with an Important security impact by Red Hat. The update fixes the issue by correcting the handling of intermediate certificates to prevent exploitation.