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CVE-2026-15308

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:87f675b26f89ba4dcaddaf70815754b29f9a5ef5c927835b2890d3d840ff1046
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","modules":["html.parser","html"],"product":"CPython","repo":"https://github.com/python/cpython","vendor":"Python Software Foundation","versions":[{"lessThan":"3.15.0b4","status":"affected","version":"0","versionType":"python"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-400","description":"CWE-400","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/07/09/4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/adp/1/references/0
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/3
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/5
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/153030"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/2
{"tags":["patch"],"url":"https://github.com/python/cpython/pull/153031"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/references/1
{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b43583ce21cb4840bf2c72df8b7a0dbb4dc66ce8eaf61da322bb4d95ab392322 · sha256:91a780d1a534d83e… · /containers/cna/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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