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CVE-2026-56851

Status: DeferredHigh (7.5)—

The Nickname profile can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector AV:N/PR:N/UI:N indica explotación remota sin autenticación (T1190). CWE-787 (out-of-bounds) causa panic/crash en buffer corto: denegación de servicio (T1499.004, application crash).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-56851",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-56851",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-08T13:48:57.351617Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "golang.org/x/text",
          "product": "golang.org/x/text/secure/precis",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "0.41.0",
              "versionType": "semver"
            }
          ],
          "packageName": "golang.org/x/text/secure/precis",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "nickAdditionalMapping.Transform"
            },
            {
              "name": "Profile.Append"
            },
            {
              "name": "Profile.AppendCompareKey"
            },
            {
              "name": "Profile.Bytes"
            },
            {
              "name": "Profile.Compare"
            },
            {
              "name": "Profile.CompareKey"
            },
            {
              "name": "Profile.NewTransformer"
            },
            {
              "name": "Profile.String"
            },
            {
              "name": "Transformer.Bytes"
            },
            {
              "name": "Transformer.String"
            },
            {
              "name": "Transformer.Transform"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-07T18:17:20.903",
  "references": [
    {
      "url": "https://go.dev/cl/793360",
      "source": "security@golang.org"
    },
    {
      "url": "https://go.dev/issue/80112",
      "source": "security@golang.org"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-6629",
      "source": "security@golang.org"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Nickname profile can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer."
    }
  ],
  "lastModified": "2026-10-08T21:35:53.890",
  "sourceIdentifier": "security@golang.org"
}