Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-49476

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:233936483255af79cbeec8ff0f71db730ab12a9757ad40af68e7ba33ae43fe7c
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-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/problemTypes/1/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:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /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:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39","tags":["x_refsource_MISC"],"url":"https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /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:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/references/2
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:be49d8590c51e286f3f9784c2b02d50aafd7ecfdb3bfe8cfa769bbf2e7724d51 · sha256:d9dcd3ebd92551e1… · /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.

← Back to CVE Explorer