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  4. CVE 2026 97040 cgo directive injection via syso files disguised
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-97040

Cgo directive injection via .syso files disguised as Go object files in cmd/go and cmd/linkCVE-2026-97040

Answer in brief

CVE-2026-97040 records a Unknown severity vulnerability in Cgo directive injection via .syso files disguised as Go object files in cmd/go and cmd/link. The current sources do not mark it as known exploited. The current feed maps Go toolchain/cmd/go (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
3 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/go (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/gogeneric>=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/go, Go toolchain/cmd/link, toolchain.
  2. 2Review the reported fix. Update Go toolchain/cmd/go 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 package containing a crafted ".syso" file could bypass cgo flag validation and inject arbitrary linker flags when linking. When loading ".syso" entries from a package archive, the linker only checked for recognized host object headers (ELF, Mach-O, PE, and XCOFF) before falling through to Go object parsing. A ".syso" file beginning with a "go object" header was parsed as a Go compiler object, allowing untrusted cgo metadata directives (such as "cgo_ldflag" or "cgo_dynamic_linker") embedded in the ".syso" file to be passed to the external linker without validation. Additionally, ".syso" filenames longer than 16 bytes lost their ".syso" extension when truncated in archive headers, and unrecognized ".syso" formats forced external linking in pure-Go builds. The linker now rejects ".syso" files that are not recognized host object formats, and "cmd/go" and "cmd/pack" preserve the ".syso" suffix when truncating long archive member names.

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

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-94
Source
CVE List V5
Source checked
Nov 11, 2026
References
4 linked sources
Open source record