Description
Building a malicious package that uses "#cgo pkg-config:" directives could load untrusted pkg-config ".pc" files or inject unvalidated compiler and linker flags. The pkg-config flag allowlist previously permitted "--with-path=" and "--personality=", allowed "--define-variable=" values beginning with "=" or "$" (which can rewrite paths in system ".pc" files into sysroot-prefixed "-L=" or "-L$SYSROOT" linker search paths), and allowed package arguments ending in ".pc" or containing path separators or "..", which caused pkg-config to load local ".pc" files directly from the package directory. In addition, flags returned by "pkg-config --cflags" in cgoCPPFLAGS were not checked when determining whether internal linking is safe. The go command now disallows "--with-path=", "--personality=", leading "=" or "$" characters in "--define-variable=" values, and local ".pc" paths in "#cgo pkg-config:" directives, and inspects cgoCPPFLAGS when checking internal linking compatibility.
Published: 2026-11-11
Score: n/a
EPSS: < 1% Very Low
KEV: No
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History

Wed, 11 Nov 2026 03:30:00 +0000

Type Values Removed Values Added
Description Building a malicious package that uses "#cgo pkg-config:" directives could load untrusted pkg-config ".pc" files or inject unvalidated compiler and linker flags. The pkg-config flag allowlist previously permitted "--with-path=" and "--personality=", allowed "--define-variable=" values beginning with "=" or "$" (which can rewrite paths in system ".pc" files into sysroot-prefixed "-L=" or "-L$SYSROOT" linker search paths), and allowed package arguments ending in ".pc" or containing path separators or "..", which caused pkg-config to load local ".pc" files directly from the package directory. In addition, flags returned by "pkg-config --cflags" in cgoCPPFLAGS were not checked when determining whether internal linking is safe. The go command now disallows "--with-path=", "--personality=", leading "=" or "$" characters in "--define-variable=" values, and local ".pc" paths in "#cgo pkg-config:" directives, and inspects cgoCPPFLAGS when checking internal linking compatibility.
Title Flag sanitization bypass via "#cgo pkg-config:" directives in cmd/go
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-11-11T03:13:15.684Z

Reserved: 2026-09-23T23:05:04.987Z

Link: CVE-2026-97039

cve-icon Vulnrichment

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cve-icon NVD

Status : Received

Published: 2026-11-11T05:19:58.133

Modified: 2026-11-11T05:19:58.133

Link: CVE-2026-97039

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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