CVE-2026-97043 Unexpected code execution via escaped quotes in //go:cgo_ldflag in cmd/go and cmd/compile
go toolchain: 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
Building a malicious package that uses cgo could bypass "#cgo LDFLAGS" validation and cause unexpected code execution at build time, or cause the go command to panic, via crafted quoting in "//go:cgo_ldflag" directives. When "cmd/cgo" generates "_cgo_gotypes.go", it quotes each "#cgo LDFLAGS" argument with strconv.Quote in a "//go:cgo_ldflag" directive, but "cmd/compile" and "cmd/go" parsed those directives by splitting on raw quote characters without handling backslash escapes or unquoting the string. This mismatch allowed disallowed linker flags or unvalidated linker search paths to be smuggled past the go command's flag checks and passed to the external linker. In addition, deduplicating LDFLAGS in the go command could panic with an out-of-bounds slice index when a prefix of the flag list matched near the end of the slice. "cmd/compile" and "cmd/go" now properly handle backslash-escaped quotes and unquote "//go:cgo_*" pragma strings with strconv.Unquote, and the slice bounds check in processCgoOutputs has been fixed.
- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 19th 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/compile
- 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 |
| Go toolchain cmd/compile | before 1.26.11 |
| Go toolchain cmd/compile | 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-2026-6848 | 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-2026-97043 |
| Debian | 13 | golang-1.24 | no fix listed | DEBIAN-CVE-2026-97043 |
| Debian | 14 | golang-1.26 | 1.26.11-1 | DEBIAN-CVE-2026-97043 |
| Debian | 14 | golang-1.27 | 1.27.4-1 | DEBIAN-CVE-2026-97043 |
| Ubuntu | 14.04:LTS | golang-1.10 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 16.04:LTS | golang-1.6, golang-1.10 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 18.04:LTS | golang-1.8, golang-1.9, golang-1.10 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 20.04:LTS | golang-1.13, golang-1.14, golang-1.18 and 3 more | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 22.04:LTS | golang-1.17, golang-1.18, golang-1.20 and 6 more | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 24.04:LTS | golang-1.21, golang-1.22, golang-1.23 and 3 more | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 26.04:LTS | golang-1.23, golang-1.24, golang-1.25 and 1 more | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | 26.10 | golang-1.26, golang-1.27 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | Pro:16.04:LTS | golang-1.13, golang-1.18 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | Pro:18.04:LTS | golang-1.13, golang-1.16, golang-1.18 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | Pro:20.04:LTS | golang-1.16 | no fix listed | UBUNTU-CVE-2026-97043 |
| Ubuntu | Pro:22.04:LTS | golang-1.13 | no fix listed | UBUNTU-CVE-2026-97043 |
| 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-2026-97043 |
| Azure Linux | 3 | gcc | no fix listed | AZL-113392 |
| Azure Linux | 3 | golang | no fix listed | AZL-113420 AZL-113465 |
| Azure Linux | 3 | python-tensorboard | no fix listed | AZL-113594 |
| Azure Linux | 3 | tensorflow | no fix listed | AZL-113642 |
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.