{"id":"CVE-2026-84311","state":"PUBLISHED","title":"pypdf: Possible long runtimes/large memory usage when extracting XForm objects","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.","publishedAt":"2026-09-01T20:03:13.421Z","updatedAt":"2026-09-02T16:02:25.222Z","severity":{"score":4.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["py-pdf pypdf"],"affected":[{"vendor":"py-pdf","product":"pypdf","versions":[{"version":"< 6.16.1","status":"affected"}]}],"references":["https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2","https://github.com/py-pdf/pypdf/pull/3966","https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","https://github.com/py-pdf/pypdf/releases/tag/6.16.1"],"weaknesses":["CWE-834"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84311.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84311","state":"PUBLISHED","datePublished":"2026-09-01T20:03:13.421Z","dateUpdated":"2026-09-02T16:02:25.222Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-01T16:17:43.079Z"},"containers":{"cna":{"title":"pypdf: Possible long runtimes/large memory usage when extracting XForm objects","descriptions":[{"lang":"en","value":"pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1."}],"affected":[{"vendor":"py-pdf","product":"pypdf","versions":[{"version":"< 6.16.1","status":"affected"}]}],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2","name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/py-pdf/pypdf/pull/3966","name":"https://github.com/py-pdf/pypdf/pull/3966","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","name":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.16.1","name":"https://github.com/py-pdf/pypdf/releases/tag/6.16.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-834","lang":"en","description":"CWE-834: Excessive Iteration","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-01T20:03:13.421Z"},"source":{"advisory":"GHSA-763m-79hh-57f2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T13:42:21.690154Z","id":"CVE-2026-84311","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-02T16:02:25.222Z"}}]}}}