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CVE-2026-27140VulnerabilityPublished Updated

Red Hat Security Advisory: go-toolset:rhel8 security update

Affects Red Hat go-toolset:rhel8Source GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2026-27140· High 8.8

Not known to be exploited · CVSS 8.8 High : upgrade Red Hat go to 1.26.2 or 1.25.9 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.26.2, 1.25.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 cmd/go to 1.26.2 or 1.25.9.

Affected software

ProductAffectedFixed in
Go toolchaincmd/goAffected
  • >=1.26.0-0 <1.26.2
Fixed in
  • 1.26.2
Go toolchaincmd/goAffected
  • <1.25.9
Fixed in
  • 1.25.9
Gocmd/gopkg:golang/cmd/goOther threatsAffected
  • <1.25.9
  • >=1.26.0-0 <1.26.2
Fixed in
  • 1.25.9
  • 1.26.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Go Toolset provides the Go programming language tools and libraries. Go is alternatively known as golang. Security Fix(es): * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) * golang: cmd/compile: no-op interface conversion bypasses overlap checking (CVE-2026-27144) * cmd/go: golang: Go (golang) and cmd/go: Arbitrary Code Execution via malicious SWIG file names (CVE-2026-27140) * golang: cmd/compile: possible memory corruption after bound check elimination (CVE-2026-27143) 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

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