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    CVE-2026-27140

    SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.

    Published:Apr 8, 2026
    Last Modified:Aug 27, 2026
    EPS:Apr 8, 2026
    EPSS Score:0.00658
    CVSS Score:8.8

    Affected Products

    Vendor
    Golang
    Product
    Go
    Vendor
    Gotoolchain
    Product
    Cmd/go

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-39820 (CVSS 7.5) — Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU …
    CVE-2026-42501 (CVSS 7.5) — A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass check…
    CVE-2026-39823 (CVSS 6.1) — CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <conten…
    CVE-2026-33811 (CVSS 7.5) — When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C me…
    CVE-2026-39826 (CVSS 6.1) — If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' att…
    CVE-2026-39817 (CVSS 5.9) — The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) d…
    CVE-2026-39819 (CVSS 5.3) — The "go bug" command writes to two files with predictable names in the system temporary directory (for example…
    CVE-2026-42499 (CVSS 7.5) — Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.…
    CVE-2026-39825 (CVSS 5.3) — ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewr…
    CVE-2026-39836 (CVSS 7.5) — The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).…

    References

    https://go.dev/cl/763768
    https://go.dev/issue/78335
    https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
    https://pkg.go.dev/vuln/GO-2026-4871
    https://access.redhat.com/errata/RHSA-2026:10217
    https://access.redhat.com/errata/RHSA-2026:10219
    https://access.redhat.com/errata/RHSA-2026:10704
    https://access.redhat.com/errata/RHSA-2026:16021
    https://access.redhat.com/errata/RHSA-2026:16024
    https://access.redhat.com/errata/RHSA-2026:16494
    https://access.redhat.com/errata/RHSA-2026:16497
    https://access.redhat.com/errata/RHSA-2026:16498
    https://access.redhat.com/errata/RHSA-2026:16694
    https://access.redhat.com/errata/RHSA-2026:16697
    https://access.redhat.com/errata/RHSA-2026:16698
    https://access.redhat.com/errata/RHSA-2026:23246
    https://access.redhat.com/errata/RHSA-2026:25182
    https://access.redhat.com/errata/RHSA-2026:34099
    https://access.redhat.com/errata/RHSA-2026:56854
    https://access.redhat.com/errata/RHSA-2026:57408
    https://access.redhat.com/errata/RHSA-2026:57545
    https://access.redhat.com/security/cve/CVE-2026-27140
    https://bugzilla.redhat.com/show_bug.cgi?id=2456341
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27140.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High