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  4. CVE 2026 97042 linker flag injection via cgoimportdynamic and pe
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-97042

Linker flag injection via cgo_import_dynamic and PE DLL names in cmd/cgo, cmd/compile, and cmd/linkCVE-2026-97042

Answer in brief

CVE-2026-97042 records a Unknown severity vulnerability in Linker flag injection via cgo_import_dynamic and PE DLL names in cmd/cgo, cmd/compile, and cmd/link. The current sources do not mark it as known exploited. The current feed maps Go toolchain/cmd/cgo (generic), Go toolchain/cmd/compile (generic), Go toolchain/cmd/link (generic), toolchain (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Go toolchain/cmd/cgo (generic), Go toolchain/cmd/compile (generic), Go toolchain/cmd/link (generic), toolchain (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Go toolchain/cmd/cgogeneric>=0 <1.26.11 || >=1.27.0-0 <1.27.41.26.11, 1.27.4
Go toolchain/cmd/compilegeneric>=0 <1.26.11 || >=1.27.0-0 <1.27.41.26.11, 1.27.4
Go toolchain/cmd/linkgeneric>=0 <1.26.11 || >=1.27.0-0 <1.27.41.26.11, 1.27.4
toolchaingo>=0 <1.26.11 >=1.27.0-0 <1.27.41.26.11, 1.27.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Go toolchain/cmd/cgo, Go toolchain/cmd/compile, Go toolchain/cmd/link.
  2. 2Review the reported fix. Update Go toolchain/cmd/cgo to 1.26.11; Go toolchain/cmd/compile to 1.26.11; Go toolchain/cmd/link to 1.26.11; toolchain to 1.26.11 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • Source referencego.dev
  • Source referencego.dev
  • Source referencegroups.google.com
  • Source referencepkg.go.dev
Upstream source description

Building a malicious package that uses "//go:cgo_import_dynamic" or links against a crafted PE object on Windows could pass unsafe library arguments to the external linker. The compiler only checked the first character of the library name in "//go:cgo_import_dynamic" directives and skipped validation in cgo-generated files. In addition, on Windows, "cmd/cgo" and "cmd/link" did not validate imported DLL names extracted from PE object files before emitting "-l<name>" flags for the external linker, allowing a crafted DLL name containing ".." path traversal or special characters to reference arbitrary files on disk. The compiler now validates every character of the library name in "//go:cgo_import_dynamic" directives (including in cgo-generated files on Windows) and rejects ".." path traversal, and "cmd/cgo" and "cmd/link" reject PE imported DLL names containing path separators, "..", ":", or leading "-" or "@".

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Unexpected code execution via --sysroot, -target, -isysroot, -Wl,-syslibroot, and -x cgo flags in cmd/goSame toolchain package
  • Arbitrary command execution via GCC spec files in cgo linker search directories in cmd/goSame toolchain package
  • Unexpected code execution and arbitrary file write via Clang -gen-* and GCC -gnat* flags in cgo in cmd/goSame toolchain package
  • Arbitrary code execution during build on darwin via "-l to_library" in cgo in cmd/goSame toolchain package
  • Linker script injection via split -Wl, flags and Darwin or symbol linker flags in cgo in cmd/goSame toolchain package
  • Arbitrary code execution via crafted .syso files and cgo linker input files in cmd/goSame toolchain package

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-88
Source
CVE List V5
Source checked
Nov 11, 2026
References
4 linked sources
Open source record