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CVE-2026-49477

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 contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ea5e670dee2aa8efccc0b9225b00020f1a4db338f29889ad7d1cf94ba5a43ce9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"soupsieve","vendor":"facelessuser","versions":[{"status":"affected","version":"< 2.8.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3","tags":["x_refsource_MISC"],"url":"https://github.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/references/1
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/references/2
{"name":"https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37","tags":["x_refsource_CONFIRM"],"url":"https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48e536c6ca327e0477326984ca385f6e5c238f7c1792f748349de35a71f72813 · sha256:8fc4e190acb7b7eb… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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