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            "value": "RHSA-2026:11856: Red Hat Quay 3.12"
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            "value": "RHSA-2026:19108: multicluster engine for Kubernetes 2.11"
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            "value": "Reported to Red Hat."
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            "time": "2026-04-06T16:22:45.353Z",
            "value": "Made public."
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        "title": "github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object",
        "workarounds": [
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            "lang": "en",
            "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."
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          "lang": "en",
          "value": "Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.4 and 3.0.5, decrypting a JSON Web Encryption (JWE) object will panic if the alg field indicates a key wrapping algorithm (one ending in KW, with the exception of A128GCMKW, A192GCMKW, and A256GCMKW) and the encrypted_key field is empty. The panic happens when cipher.KeyUnwrap() in key_wrap.go attempts to allocate a slice with a zero or negative length based on the length of the encrypted_key. This code path is reachable from ParseEncrypted() / ParseEncryptedJSON() / ParseEncryptedCompact() followed by Decrypt() on the resulting object. Note that the parse functions take a list of accepted key algorithms. If the accepted key algorithms do not include any key wrapping algorithms, parsing will fail and the application will be unaffected. This panic is also reachable by calling cipher.KeyUnwrap() directly with any ciphertext parameter less than 16 bytes long, but calling this function directly is less common. Panics can lead to denial of service. This vulnerability is fixed in 4.1.4 and 3.0.5."
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        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:34789: Red Hat OpenShift Container Platform 4.22"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36796: RHEM 1.0 for RHEL 9"
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            "value": "RHSA-2026:30855: Red Hat Enterprise Linux AppStream (v. 10)"
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            "lang": "en",
            "value": "RHSA-2026:35827: Red Hat Enterprise Linux AppStream (v. 10)"
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            "value": "RHSA-2026:34357: Red Hat Enterprise Linux AppStream (v. 10)"
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            "value": "RHSA-2026:30853: Red Hat Enterprise Linux AppStream (v. 8)"
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            "lang": "en",
            "value": "RHSA-2026:35830: Red Hat Enterprise Linux AppStream (v. 8)"
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            "lang": "en",
            "value": "RHSA-2026:35831: Red Hat Enterprise Linux AppStream (v. 8)"
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            "value": "RHSA-2026:30854: Red Hat Enterprise Linux AppStream (v. 9)"
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            "value": "RHSA-2026:35828: Red Hat Enterprise Linux AppStream (v. 9)"
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            "value": "RHSA-2026:36797: Red Hat Trusted Artifact Signer 1.4"
          },
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            "value": "RHSA-2026:36105: multicluster engine for Kubernetes 2.6"
          },
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        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-22T16:00:52.844Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-22T15:01:21.462Z",
            "value": "Made public."
          }
        ],
        "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
        "workarounds": [
          {
            "lang": "en",
            "value": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
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    ],
    "cna": {
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        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/idna",
          "product": "golang.org/x/net/idna",
          "programRoutines": [
            {
              "name": "Profile.process"
            },
            {
              "name": "Profile.ToASCII"
            },
            {
              "name": "Profile.ToUnicode"
            },
            {
              "name": "ToASCII"
            },
            {
              "name": "ToUnicode"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "KC1zs4 (https://github.com/KC1zs4)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\"."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.462Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/767220"
        },
        {
          "url": "https://go.dev/issue/78760"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
        }
      ],
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-39821",
    "datePublished": "2026-05-22T15:01:21.462Z",
    "dateReserved": "2026-04-07T18:13:03.526Z",
    "dateUpdated": "2026-07-10T12:05:36.478Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}