Vulnerability-Lookup

RUSTSEC-2026-0382 (CVE-2026-111943)

Vulnerability from osv_rustsec – Published: 2026-10-20 12:00 – Updated: 2026-10-20 19:24 – Source website

Summary

Certificate verification may accept distrusted intermediates

Details

Affected versions may accept certificate paths containing distrusted emSign intermediate public keys when the configured trust anchors allow such paths. The private keys corresponding to these intermediates are now well known.

Versions 0.103.16 and 0.104.0-alpha.8 reject paths containing these public keys.

References

URL

Type

	https://crates.io/crates/rustls-webpki	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0382.html	ADVISORY
	https://github.com/rustls/webpki/pull/546	WEB
	https://emudhra.we-have-a-problem.com/	WEB
	https://bugzilla.mozilla.org/show_bug.cgi?id=2083449	WEB

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rustls-webpki",
        "purl": "pkg:cargo/rustls-webpki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.103.16"
            },
            {
              "introduced": "0.104.0-alpha.1"
            },
            {
              "fixed": "0.104.0-alpha.8"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-111943"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Affected versions may accept certificate paths containing distrusted emSign\nintermediate public keys when the configured trust anchors allow such paths.\nThe private keys corresponding to these intermediates are now well known.\n\nVersions 0.103.16 and 0.104.0-alpha.8 reject paths containing these public keys.",
  "id": "RUSTSEC-2026-0382",
  "modified": "2026-10-20T19:24:19Z",
  "published": "2026-10-20T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/rustls-webpki"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0382.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rustls/webpki/pull/546"
    },
    {
      "type": "WEB",
      "url": "https://emudhra.we-have-a-problem.com/"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2083449"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Certificate verification may accept distrusted intermediates"
}

CVE-2026-111943 (GCVE-0-2026-111943)

Vulnerability from cvelistv5 – Published: 2026-10-21 00:52 – Updated: 2026-10-21 01:24

Title

Distrust compromised intermediate certificates in crypto/x509

Summary

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

Severity

No CVSS data available.

CWE

CWE-299 - Improper Check for Certificate Revocation

Assigner

Go CNA under the Google root

CNA scorecard E 42/100 over 74 records in the last 180 days details

References

5 references

URL	Tags
https://go.dev/cl/851047
https://go.dev/issue/82345
https://groups.google.com/g/golang-announce/c/66p…
https://pkg.go.dev/vuln/GO-2026-6809
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
Go standard library	crypto/x509	Affected: 0 , < 1.26.10 (semver) Affected: 1.27.0-0 , < 1.27.3 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-10-21T01:24:20.498Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/10/20/29"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/x509",
          "product": "crypto/x509",
          "programRoutines": [
            {
              "name": "Certificate.Verify"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.10",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-299: Improper Check for Certificate Revocation",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T00:52:18.359Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/851047"
        },
        {
          "url": "https://go.dev/issue/82345"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/66pojueaQek"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6809"
        }
      ],
      "title": "Distrust compromised intermediate certificates in crypto/x509"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-111943",
    "datePublished": "2026-10-21T00:52:18.359Z",
    "dateReserved": "2026-10-17T13:43:28.599Z",
    "dateUpdated": "2026-10-21T01:24:20.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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