Vulnerability-Lookup

RHSA-2026:32987

Vulnerability from csaf_redhat - Published: 2026-06-29 11:45 - Updated: 2026-09-09 00:37

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: golang-fips1.25: * golang-fips1.25-1.25.9-0.1.1.hum1 (aarch64, x86_64) * golang-fips1.25-bin-1.25.9-0.1.1.hum1 (aarch64, x86_64) * golang-fips1.25-docs-1.25.9-0.1.1.hum1 (noarch) * golang-fips1.25-misc-1.25.9-0.1.1.hum1 (noarch) * golang-fips1.25-race-1.25.9-0.1.1.hum1 (aarch64, x86_64) * golang-fips1.25-src-1.25.9-0.1.1.hum1 (noarch) * golang-fips1.25-tests-1.25.9-0.1.1.hum1 (noarch) * golang-fips1.25-1.25.9-0.1.1.hum1.src (src) Security Fix(es): golang-fips1.25: * CVE-2026-42501

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-42501

A flaw was found in the Go command (`cmd/go`). A malicious module proxy can exploit this vulnerability by bypassing the validation of module checksums. This allows the proxy to serve altered versions of the Go toolchain, which the `go` command may then download and execute without proper verification. This can lead to the execution of untrusted code, compromising the integrity of the Go development environment.

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

CWE-347 - Improper Verification of Cryptographic Signature

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:golang-fips1-25-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:golang-fips1-25-main@noarch	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:golang-fips1-25-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:golang-fips1-25-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:32987	self
https://access.redhat.com/security/cve/CVE-2026-42501	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-42501	self
https://bugzilla.redhat.com/show_bug.cgi?id=2467810	external
https://www.cve.org/CVERecord?id=CVE-2026-42501	external
https://nvd.nist.gov/vuln/detail/CVE-2026-42501	external
https://go.dev/cl/775321	external
https://go.dev/issue/79070	external
https://groups.google.com/g/golang-announce/c/qcC…	external
https://pkg.go.dev/vuln/GO-2026-4984	external

JSON

To clipboard

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      "cve": "CVE-2026-42501",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
      },
      "discovery_date": "2026-05-07T20:00:54.811489+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467810"
        }
      ],
      "notes": [
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          "category": "description",
          "text": "A flaw was found in the Go command (`cmd/go`). A malicious module proxy can exploit this vulnerability by bypassing the validation of module checksums. This allows the proxy to serve altered versions of the Go toolchain, which the `go` command may then download and execute without proper verification. This can lead to the execution of untrusted code, compromising the integrity of the Go development environment.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
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          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate impact flaw in the Go command (`cmd/go`) allows a malicious module proxy to bypass checksum validation, potentially leading to the execution of untrusted Go toolchains. Red Hat products utilizing the Go command are vulnerable if configured to use an untrusted module proxy or checksum database, as this could compromise the integrity of the Go development environment. Exploitation requires user interaction with a compromised proxy.",
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          "summary": "https://go.dev/issue/79070",
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          "date": "2026-06-29T11:45:06+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:golang-fips1-25-main@aarch64",
            "Red Hat Hardened Images:golang-fips1-25-main@noarch",
            "Red Hat Hardened Images:golang-fips1-25-main@src",
            "Red Hat Hardened Images:golang-fips1-25-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:32987"
        },
        {
          "category": "workaround",
          "details": "To verify the integrity of Go module dependencies and detect potential tampering by a malicious proxy, users can revalidate all dependencies of the current module. This process involves removing the existing `go.sum` file and then re-generating and verifying module checksums.\n\nExecute the following commands in your module\u0027s root directory:\n```bash\nrm go.sum\ngo mod tidy\ngo mod verify\n```\nThis operation will re-download and re-verify all module dependencies. Be aware that this may affect your local module cache and could require re-building projects.",
          "product_ids": [
            "Red Hat Hardened Images:golang-fips1-25-main@aarch64",
            "Red Hat Hardened Images:golang-fips1-25-main@noarch",
            "Red Hat Hardened Images:golang-fips1-25-main@src",
            "Red Hat Hardened Images:golang-fips1-25-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:golang-fips1-25-main@aarch64",
            "Red Hat Hardened Images:golang-fips1-25-main@noarch",
            "Red Hat Hardened Images:golang-fips1-25-main@src",
            "Red Hat Hardened Images:golang-fips1-25-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "cmd/go: golang: Go command (cmd/go): Integrity bypass due to checksum validation flaw via malicious module proxy"
    }
  ]
}

CVE-2026-42501 (GCVE-0-2026-42501)

Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 15:48

Title

Malicious module proxy can bypass checksum database in cmd/go

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-08 15:48 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

Go Google root

References

4 references

URL	Tags
https://go.dev/cl/775321
https://go.dev/issue/79070
https://groups.google.com/g/golang-announce/c/qcC…
https://pkg.go.dev/vuln/GO-2026-4984

Impacted products

1 product

Vendor	Product	Version
Go toolchain	cmd/go	Affected: 0 , < 1.25.10 (semver) Affected: 1.26.0-0 , < 1.26.3 (semver)

Credits

Mundur (https://github.com/M0nd0R)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
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        {
          "lang": "en",
          "value": "Mundur (https://github.com/M0nd0R)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A malicious module proxy can exploit a flaw in the go command\u0027s 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\u0027s 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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-07T19:41:19.691Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/775321"
        },
        {
          "url": "https://go.dev/issue/79070"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4984"
        }
      ],
      "title": "Malicious module proxy can bypass checksum database in cmd/go"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-42501",
    "datePublished": "2026-05-07T19:41:19.691Z",
    "dateReserved": "2026-04-28T00:21:12.791Z",
    "dateUpdated": "2026-05-08T15:48:47.404Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:32987

CVE-2026-42501 (GCVE-0-2026-42501)

Tags

Sightings

Nomenclature