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VulnerabilityPublished

CVE-2026-97040: Building a package containing a crafted ".syso" file could bypass cgo flag validation and inject

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Authoritative record:CVE-2026-97040· High

Not known to be exploited : upgrade to 1.27.4 or 1.26.11 soon.

Data as of 11 Nov 2026, 08:03 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 1.27.4, 1.26.11

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 10 Nov 2026.

What to do

Upgrade cmd/go and cmd/link to 1.27.4 or 1.26.11.

Affected software

ProductAffectedFixed in
Go toolchaincmd/goAffected
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.27.4
Go toolchaincmd/goAffected
  • <1.26.11
Fixed in
  • 1.26.11
Go toolchaincmd/linkAffected
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.27.4
Go toolchaincmd/linkAffected
  • <1.26.11
Fixed in
  • 1.26.11
Gocmd/gopkg:golang/cmd/goOther threatsAffected
  • <1.26.11
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.26.11
  • 1.27.4
Gocmd/linkpkg:golang/cmd/linkOther threatsAffected
  • <1.26.11
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.26.11
  • 1.27.4

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

AI-suggested

The Go linker has been updated to reject ".syso" files that are not recognized host object formats and to preserve the ".syso" suffix when truncating long archive member names. Users should update to the fixed versions of the Go toolchain once available.

Description

A vulnerability in the Go toolchain allows a crafted ".syso" file to bypass cgo flag validation and inject arbitrary linker flags during linking. This occurs because the linker incorrectly parses certain ".syso" files as Go compiler objects, enabling untrusted cgo metadata directives to be passed to the external linker without validation. Additionally, long ".syso" filenames losing their extension and unrecognized formats forced external linking in pure-Go builds. The linker has been updated to reject unrecognized ".syso" files and preserve the ".syso" suffix when truncating archive member names.

References

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