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CVE-2026-97033VulnerabilityPublished

Building a malicious package that uses cgo could cause arbitrary code execution at build time through several compiler

Source GCVE Database

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Authoritative record:CVE-2026-97033· High

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

Data as of 11 Nov 2026, 08:05 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 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
Gocmd/gopkg:golang/cmd/goOther 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 vulnerability has been mitigated by disallowing the use of "--sysroot" and "-target" flags in "#cgo" directives, verifying that "-isysroot" and "-Wl,-syslibroot" flags do not point to regular files, and restricting the "-x" flag to only the C, C++, Objective-C, and assembler languages supported by cgo. Users should ensure they are using a version of the build tools or cgo implementation that includes these restrictions.

Description

A vulnerability in the cgo build process allows malicious packages to execute arbitrary code at build time by exploiting certain compiler and linker flags in "#cgo" directives. Flags such as "--sysroot" and "-target" could be abused to redirect compiler components or execute helper tools from attacker-controlled locations. Restrictions have been applied to disallow or validate these flags to prevent exploitation.

References

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