CVE-2026-49476 (GCVE-0-2026-49476)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:53 – Updated: 2026-07-15 14:27
VLAI
Title
Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve
Summary
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:26 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version CPE status
facelessuser soupsieve Affected: < 2.8.4
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-49476",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T14:26:25.402577Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-15T14:27:06.146Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "soupsieve",
          "vendor": "facelessuser",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.8.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T20:53:12.497Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
        },
        {
          "name": "https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39"
        },
        {
          "name": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4"
        }
      ],
      "source": {
        "advisory": "GHSA-2wc2-fm75-p42x",
        "discovery": "UNKNOWN"
      },
      "title": "Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49476",
    "datePublished": "2026-07-14T20:53:12.497Z",
    "dateReserved": "2026-05-30T04:17:43.095Z",
    "dateUpdated": "2026-07-15T14:27:06.146Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-49476",
      "date": "2026-09-29",
      "epss": "0.00644",
      "percentile": "0.4883"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "soupsieve",
                "vendor": "facelessuser",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.8.4"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:facelessuser:soup_sieve:*:*:*:*:*:beautiful_soup:*:*",
                    "matchCriteriaId": "6819C9CA-C98C-47D1-B9DE-E6C32A933427",
                    "versionEndExcluding": "2.8.4",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4."
          }
        ],
        "id": "CVE-2026-49476",
        "lastModified": "2026-07-28T15:48:11.780",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-49476",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T14:26:25.402577Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-14T21:17:01.877",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Release Notes"
            ],
            "url": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "tags": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-400"
              },
              {
                "lang": "en",
                "value": "CWE-770"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-27T15:16:25+00:00",
      "cve": "CVE-2026-49476",
      "id": "CVE-2026-49476",
      "initial_release_date": "2026-07-14T20:53:12.497000+00:00",
      "product_status:fixed": "42",
      "product_status:known_affected": "15",
      "product_status:known_not_affected": "289",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "python-soupsieve: Soupsieve: Denial of Service via crafted CSS selector string",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49476.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-12T16:31:20Z",
      "cve": "CVE-2026-49476",
      "id": "CVE-2026-49476",
      "initial_release_date": "2026-07-11T03:23:30Z",
      "product_status:known_affected": "8",
      "product_status:recommended": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-49476",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-49476.json",
      "version": "8"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-49476",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-15T14:26:25.402577Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-15T14:26:41.737Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "soupsieve",
              "vendor": "facelessuser",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 2.8.4"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-400",
                  "description": "CWE-400: Uncontrolled Resource Consumption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-770",
                  "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-14T20:53:12.497Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"
            },
            {
              "name": "https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39"
            },
            {
              "name": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4"
            }
          ],
          "source": {
            "advisory": "GHSA-2wc2-fm75-p42x",
            "discovery": "UNKNOWN"
          },
          "title": "Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-49476",
        "datePublished": "2026-07-14T20:53:12.497Z",
        "dateReserved": "2026-05-30T04:17:43.095Z",
        "dateUpdated": "2026-07-14T20:53:12.497Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.