{
  "affected": [
    {
      "affectedData": [
        {
          "product": "distribution",
          "vendor": "distribution",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:distribution_project:distribution:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "A9736C6D-CC89-49C4-BF90-C1E5F31A82B0",
              "versionEndExcluding": "3.1.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Distribution is a toolkit to pack, ship, store, and deliver container content. Prior to 3.1.0, in pull-through cache mode, distribution discovers token auth endpoints by parsing WWW-Authenticate challenges returned by the configured upstream registry. The realm URL from a bearer challenge is used without validating that it matches the upstream registry host. As a result, an attacker-controlled upstream (or an attacker with MitM position to the upstream) can cause distribution to send the configured upstream credentials via basic auth to an attacker-controlled realm URL. This vulnerability is fixed in 3.1.0."
    }
  ],
  "id": "CVE-2026-33540",
  "lastModified": "2026-06-17T10:37:40.780",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-33540",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-06T15:04:46.763761Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-06T15:17:10.950",
  "references": [
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      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r"
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    {
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      "url": "https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
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}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/distribution/distribution/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/distribution/distribution"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.8.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33540"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T17:52:52Z",
    "nvd_published_at": "2026-04-06T15:17:10Z",
    "severity": "HIGH"
  },
  "details": "hi guys,\n\ncommit: 40594bd98e6d6ed993b5c6021c93fdf96d2e5851 (as-of 2026-01-31)\ncontact: GitHub Security Advisory (https://github.com/distribution/distribution/security/advisories/new)\n\n## summary\n\nin pull-through cache mode, distribution discovers token auth endpoints by parsing `WWW-Authenticate` challenges returned by the configured upstream registry. the `realm` URL from a bearer challenge is used without validating that it matches the upstream registry host. as a result, an attacker-controlled upstream (or an attacker with MitM position to the upstream) can cause distribution to send the configured upstream credentials via basic auth to an attacker-controlled `realm` URL.\n\nthis is the same vulnerability class as CVE-2020-15157 (containerd), but in distribution\u2019s pull-through cache proxy auth flow.\n\n## severity\n\nHIGH\n\nnote: the baseline impact is credential disclosure of the configured upstream credentials. if a deployment uses broader credentials for upstream auth (for example cloud iam credentials), the downstream impact can be higher; i am not claiming this as default for all deployments.\n\n## impact\n\ncredential exfiltration of the upstream authentication material configured for the pull-through cache.\n\nattacker starting positions that make this realistic:\n- supply chain / configuration: an operator configures a proxy cache to use an upstream that becomes attacker-controlled (compromised registry, stale domain, or a malicious mirror)\n- network: MitM on the upstream connection in environments where the upstream is reachable over insecure transport or a compromised network path\n\n## affected components\n\n- `registry/proxy/proxyauth.go:66-81` (`getAuthURLs`): extracts bearer `realm` from upstream `WWW-Authenticate` without validating destination\n- `internal/client/auth/session.go:485-510` (`fetchToken`): uses the realm URL directly for token fetch\n- `internal/client/auth/session.go:429-434` (`fetchTokenWithBasicAuth`): sends credentials via basic auth to the realm URL\n\n## reproduction\n\nattachment: `poc.zip` (local harness) with canonical and control runs.\n\nthe harness is local and does not contact a real registry: it uses two local HTTP servers (upstream + attacker token service) to demonstrate whether basic auth is sent to an attacker-chosen realm.\n\n```bash\nunzip -q -o poc.zip -d poc\ncd poc\nmake canonical\nmake control\n```\n\nexpected output (excerpt):\n\n```\n[CALLSITE_HIT]: getAuthURLs::configureAuth\n[PROOF_MARKER]: basic_auth_sent=true realm_host=127.0.0.1 account_param=user authorization_prefix=Basic\n```\n\ncontrol output (excerpt):\n\n```\n[CALLSITE_HIT]: getAuthURLs::configureAuth\n[NC_MARKER]: realm_validation=PASS basic_auth_sent=false\n```\n\n## suggested remediation\n\nvalidate that the token `realm` destination is within the intended trust boundary before associating credentials with it or sending any authentication to it. one conservative option is strict same-host binding: only accept a realm whose host matches the configured upstream host.\n\n## fix accepted when\n\n- distribution does not send configured upstream credentials to an attacker-chosen realm URL\n- a regression test covers the canonical and blocked cases\n\n[addendum.md](https://github.com/user-attachments/files/24984637/addendum.md)\n[poc.zip](https://github.com/user-attachments/files/24984638/poc.zip)\n[PR_DESCRIPTION.md](https://github.com/user-attachments/files/24984639/PR_DESCRIPTION.md)\n[RUNNABLE_POC.md](https://github.com/user-attachments/files/24984640/RUNNABLE_POC.md)\n\n\nbest,\noleh",
  "id": "GHSA-3p65-76g6-3w7r",
  "modified": "2026-04-06T23:42:43Z",
  "published": "2026-04-06T17:52:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33540"
    },
    {
      "type": "WEB",
      "url": "https://github.com/distribution/distribution/commit/cc5d5fa4ba02157501e6afa2cc6a903ad0338e7b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/distribution/distribution"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Distribution affected by pull-through cache credential exfiltration via www-authenticate bearer realm"
}

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      "notes": [
        {
          "category": "general",
          "text": "gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, \"deny\" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback \"allow\" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific \"deny\" rules for canonical paths but allows other requests by default (a fallback \"allow\" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers with a non-canonical path string. While upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods: Use a validating interceptor (recommended mitigation); infrastructure-level normalization; and/or policy hardening.",
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      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-34986"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-34986",
          "url": "https://www.suse.com/security/cve/CVE-2026-34986"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262805 for CVE-2026-34986",
          "url": "https://bugzilla.suse.com/1262805"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-28T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-34986"
    },
    {
      "cve": "CVE-2026-35172",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-35172"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Distribution is a toolkit to pack, ship, store, and deliver container content. Prior to 3.1.0, distribution can restore read access in repo a after an explicit delete when storage.cache.blobdescriptor: redis and storage.delete.enabled: true are both enabled. The delete path clears the shared digest descriptor but leaves stale repo-scoped membership behind, so a later Stat or Get from repo b repopulates the shared descriptor and makes the deleted blob readable from repo a again. This vulnerability is fixed in 3.1.0.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
          "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-35172",
          "url": "https://www.suse.com/security/cve/CVE-2026-35172"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262096 for CVE-2026-35172",
          "url": "https://bugzilla.suse.com/1262096"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.aarch64",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.ppc64le",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.s390x",
            "openSUSE Tumbleweed:distribution-registry-3.1.0-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-28T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-35172"
    }
  ]
}