CVE-2025-61731

Published Jan 28, 2026

Last updated 4 months ago

CVSS high 7.8
Golang
Mysql

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-61731 describes a vulnerability within the `cmd/go` component of the Go programming language. This flaw involves a bypass of the `CgoPkgConfig` flag. The bypass associated with the `CgoPkgConfig` flag can result in arbitrary code execution. This issue was identified and reported by RyotaK of GMO Flatt Security.

Description
Building a malicious file with cmd/go can cause can cause a write to an attacker-controlled file with partial control of the file content. The "#cgo pkg-config:" directive in a Go source file provides command-line arguments to provide to the Go pkg-config command. An attacker can provide a "--log-file" argument to this directive, causing pkg-config to write to an attacker-controlled location.
Source
security@golang.org
NVD status
Analyzed
Products
go

Risk scores

CVSS 3.1

Type
Secondary
Base score
7.8
Impact score
5.9
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
NVD-CWE-noinfo

Social media

Hype score
Not currently trending
  1. πŸ” Lambda Watchdog detected that CVE-2025-61731 is no longer present in latest AWS Lambda base image scans. https://t.co/djwqDoem3X #AWS #Lambda #Security #CVE #DevOps #SecOps

    @LambdaWatchdog

    23 Feb 2026

    18 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  2. 🚨 New HIGH CVE detected in AWS Lambda 🚨 CVE-2025-61731 impacts libcap in 20 Lambda base images. Details: https://t.co/djwqDoem3X More: https://t.co/6EUGaPyRZk #AWS #Lambda #CVE #CloudSecurity #Serverless

    @LambdaWatchdog

    8 Feb 2026

    1 Impression

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  3. A high severity arbitrary file write vulnerability (CVE-2025-61731) has been identified in the Go language (golang) cmd/go tool via cgo pkg-config directives. Developers should review build processes. #golang #infosec #vulnerability https://t.co/BARi1zf4I4

    @pulsepatchio

    1 Feb 2026

    64 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  4. CVE-2025-61731 Building a malicious file with cmd/go can cause can cause a write to an attacker-controlled file with partial control of the file content. The "#cgo pkg-config:" dire… https://t.co/10dh76HF77

    @CVEnew

    28 Jan 2026

    189 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  5. πŸ₯³ Go 1.26 Release Candidate 2 is released! πŸ” Security: Includes security fixes for archive/zip (CVE-2025-61728), net/http (CVE-2025-61726), crypto/tls (CVE-2025-68121, CVE-2025-61730), cmd/go (CVE-2025-61731, CVE-2025-68119). πŸƒβ€β™€οΈ Run it in dev! Run it in prod! F

    @golang

    15 Jan 2026

    22045 Impressions

    52 Retweets

    423 Likes

    30 Bookmarks

    4 Replies

    2 Quotes

  6. 🎊 Go 1.25.6 and 1.24.12 are released! πŸ” Security: Includes security fixes for archive/zip (CVE-2025-61728), net/http (CVE-2025-61726), crypto/tls (CVE-2025-68121, CVE-2025-61730), cmd/go (CVE-2025-61731, CVE-2025-68119). πŸ“£ Announcement: https://t.co/seVA1REoeH πŸ“¦ Do

    @golang

    15 Jan 2026

    14651 Impressions

    53 Retweets

    279 Likes

    26 Bookmarks

    4 Replies

    3 Quotes

  7. A Go release scheduled for Thursday, Jan 15th covering CVE-2025-61728 CVE-2025-61726 CVE-2025-68121 CVE-2025-61731 CVE-2025-68119, all currently embargoed. Reports of an SSH 0-day, in context of Go's crypto/ssh module.β€‹β€Œβ£β€Œβ£β€Œβ€Œβ€Œβ€Œβ€Œβ£β£β€Œβ€Œβ€Œβ€Œβ£β€Œβ£β£

    @_mattata

    13 Jan 2026

    327 Impressions

    0 Retweets

    5 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

Configurations

  1. A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (GOSUMDB). A malicious module proxy can serve altered versions of the Go toolchain. When selecting a different version of the Go toolchain than the currently installed toolchain (due to the GOTOOLCHAIN environment variable, or a go.work or go.mod with a toolchain line), the go command will download and execute a toolchain provided by the module proxy. A malicious module proxy can bypass checksum database validation for this downloaded toolchain. Since this vulnerability affects the security of toolchain downloads, setting GOTOOLCHAIN to a fixed version is not sufficient. You must upgrade your base Go toolchain. The go tool always validates the hash of a toolchain before executing it, so fixed versions will refuse to execute any cached, altered versions of the toolchain. The go tool trusts go.sum files to contain accurate hashes of the current module's dependencies. A malicious proxy exploiting this vulnerability to serve an altered module will have caused an incorrect hash to be recorded in the go.sum. Users who have configured a non-trusted GOPROXY can determine if they have been affected by running "rm go.sum ; go mod tidy ; go mod verify", which will revalidate all dependencies of the current module. The specific flaw in more detail: The go command consults the checksum database to validate downloaded modules, when a module is not listed in the go.sum file. It verifies that the module hash reported by the checksum database matches the hash of the downloaded module. If, however, the checksum database returns a successful response that contains no entry for the module, the go command incorrectly permitted validation to succeed. A module proxy may mirror or proxy the checksum database, in which case the go command will not connect to the checksum database directly. Checksums reported by the checksum database are cryptographically signed, so a malicious proxy cannot alter the reported checksum for a module. However, a proxy which returns an empty checksum response, or a checksum response for an unrelated module, could cause the go command to proceed as if a downloaded module has been validated.β€’CVE-2026-42501