{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6879","assignerOrgId":"28c92f92-d60d-412d-b760-e73465c3df22","state":"PUBLISHED","assignerShortName":"PSF","dateReserved":"2026-04-22T18:26:56.743Z","datePublished":"2026-07-28T13:46:30.650Z","dateUpdated":"2026-08-13T00:27:08.214Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"CPython","repo":"https://github.com/python/cpython","vendor":"Python Software Foundation","versions":[{"version":"0","lessThan":"3.10.21","status":"affected","versionType":"python"},{"version":"3.11.0","lessThan":"3.11.16","status":"affected","versionType":"python"},{"version":"3.12.0","lessThan":"3.12.14","status":"affected","versionType":"python"},{"version":"3.13.0","lessThan":"3.13.15","status":"affected","versionType":"python"},{"version":"3.14.0","lessThan":"3.14.7","status":"affected","versionType":"python"},{"version":"3.15.0a1","lessThan":"3.15.0rc1","status":"affected","versionType":"python"}]}],"credits":[{"lang":"en","type":"reporter","value":"dm (https://github.com/DarkaMaul)"},{"lang":"en","type":"coordinator","value":"Petr Viktorin (https://github.com/encukou)"}],"descriptions":[{"lang":"en","supportingMedia":[{"type":"text/html","value":"`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end  of the sibling list, such as with `[last()]` or `[last()-N]`;  `.//item[1]` short-circuits after the first match."}],"value":"`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end  of the sibling list, such as with `[last()]` or `[last()-N]`;  `.//item[1]` short-circuits after the first match."}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2,"baseSeverity":"LOW","exploitMaturity":"NOT_DEFINED","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"providerMetadata":{"orgId":"28c92f92-d60d-412d-b760-e73465c3df22","shortName":"PSF","dateUpdated":"2026-08-13T00:27:08.214Z"},"references":[{"tags":["patch"],"url":"https://github.com/python/cpython/pull/152676"},{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/152674"},{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/7YMZ6DDZVR26TJJBVO3RDNBAVGHNYAKR/"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/2ffab083782968a4d732738f4f1dff6bbd69d2b0"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/02c08e6b747ac43d0d866a4ffa916bedf3423f81"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/390337b8ba1658833fdef379e1739c9f9533a8db"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/cb409342a19f25656f62e679f8bac265fe1442c3"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/96510a3758f4a075f43223afdee3b6ee1a7a7f02"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/037965c00a427cba5c05447efadc67c51a492e85"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/0583f24ae678993e3f7939f51ad5bcae5ad9dc70"}],"source":{"discovery":"UNKNOWN"},"title":"Quadratic Behavior in xml.etree.ElementPath Index Predicates","x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-407","lang":"en","description":"CWE-407 Inefficient Algorithmic Complexity"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T14:49:33.309576Z","id":"CVE-2026-6879","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-28T14:54:07.235Z"}}]}}