CVE-2026-97035 Unexpected code execution and arbitrary file write via Clang -gen-* and GCC -gnat* flags in cgo in cmd/go
go toolchain cmd/go: no CVSS score yet. EPSS 0.3% estimated probability of exploitation activity in the next 30 days. Fixed in toolchain 1.26.11, 1.27.4.
On this page
When using Clang or GCC, building a malicious package that uses cgo could cause unexpected code execution at build time or write files to arbitrary directories via "-gen-*" or "-gnat*" flags in "#cgo" directives. The "-g*" wildcard in the compiler and linker flag allowlists previously matched Clang's two-argument "-gen-cdb-fragment-path <dir>" flag and GCC's two-argument "-gnatO <file>" flag, permitting compilation database fragments and sidecar output files to be written to arbitrary directories and desynchronizing flag argument parsing between the go command and the compiler driver so that subsequent arguments could be passed as unvalidated positional inputs to the linker. "-gen-*" and "-gnat*" flags are now disallowed in "#cgo" compiler and linker flags.
- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 17th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- Published
- Modified
- Assigned by
- Go (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- go toolchain:cmd/go
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Go toolchain cmd/go | before 1.26.11 |
| Go toolchain cmd/go | from 1.27.0-0 before 1.27.4 |
Fix and patched versions
toolchain(Go): fixed in 1.26.11, 1.27.4- Debian, SUSE, openSUSE, Alpine: fixed package versions per release
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GO-2026-6856 | Go | toolchain | <1.26.11 >=1.27.0-0 <1.27.4 | 1.26.11, 1.27.4 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12 | golang-1.19 | no fix listed | DEBIAN-CVE-2026-97035 |
| Debian | 13 | golang-1.24 | no fix listed | DEBIAN-CVE-2026-97035 |
| Debian | 14 | golang-1.26 | 1.26.11-1 | DEBIAN-CVE-2026-97035 |
| Debian | 14 | golang-1.27 | 1.27.4-1 | DEBIAN-CVE-2026-97035 |
| Ubuntu | 14.04:LTS | golang-1.10 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 16.04:LTS | golang-1.6, golang-1.10 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 18.04:LTS | golang-1.8, golang-1.9, golang-1.10 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 20.04:LTS | golang-1.13, golang-1.14, golang-1.18 and 3 more | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 22.04:LTS | golang-1.17, golang-1.18, golang-1.20 and 6 more | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 24.04:LTS | golang-1.21, golang-1.22, golang-1.23 and 3 more | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 26.04:LTS | golang-1.23, golang-1.24, golang-1.25 and 1 more | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | 26.10 | golang-1.26, golang-1.27 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | Pro:16.04:LTS | golang-1.13, golang-1.18 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | Pro:18.04:LTS | golang-1.13, golang-1.16, golang-1.18 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | Pro:20.04:LTS | golang-1.16 | no fix listed | UBUNTU-CVE-2026-97035 |
| Ubuntu | Pro:22.04:LTS | golang-1.13 | no fix listed | UBUNTU-CVE-2026-97035 |
| SUSE | Linux Enterprise High Performance Computing 15 SP4-ESPOS, Linux Enterprise High Performance Computing 15 SP4-LTSS, Linux Enterprise High Performance Computing 15 SP5-ESPOS and 8 more | go1.26 | 1.26.11-150000.1.39.1 | SUSE-SU-2026:5227-1 |
| SUSE | Linux Enterprise High Performance Computing 15 SP4-ESPOS, Linux Enterprise High Performance Computing 15 SP4-LTSS, Linux Enterprise High Performance Computing 15 SP5-ESPOS and 8 more | go1.27 | 1.27.4-150000.1.18.1 | SUSE-SU-2026:5226-1 |
| openSUSE | Tumbleweed | go1.26 | 1.26.11-1.1 | openSUSE-SU-2026:12529-1 |
| Alpine | v3.24 | go | 1.26.11-r0 | ALPINE-CVE-2026-97035 |
| Azure Linux | 3 | gcc | no fix listed | AZL-113396 |
| Azure Linux | 3 | golang | no fix listed | AZL-113435 AZL-113468 |
| Azure Linux | 3 | python-tensorboard | no fix listed | AZL-113588 |
| Azure Linux | 3 | tensorflow | no fix listed | AZL-113675 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; SUSE security data, CC BY 4.0; the Alpine secdb, CC BY-SA 4.0; Microsoft's Azure Linux vulnerability data, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · SUSE · openSUSE · Alpine.