{"id":"CVE-2026-82398","state":"PUBLISHED","title":"pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.","publishedAt":"2026-08-31T21:41:10.272Z","updatedAt":"2026-09-01T14:57:30.866Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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":"< 6.15.0","status":"affected"}]}],"references":["https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m","https://github.com/py-pdf/pypdf/pull/3947","https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa","https://github.com/py-pdf/pypdf/releases/tag/6.15.0"],"weaknesses":["CWE-407"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82398.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82398","state":"PUBLISHED","datePublished":"2026-08-31T21:41:10.272Z","dateUpdated":"2026-09-01T14:57:30.866Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-28T22:00:43.512Z"},"containers":{"cna":{"title":"pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace","descriptions":[{"lang":"en","value":"pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0."}],"affected":[{"vendor":"py-pdf","product":"pypdf","versions":[{"version":"< 6.15.0","status":"affected"}]}],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m","name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/py-pdf/pypdf/pull/3947","name":"https://github.com/py-pdf/pypdf/pull/3947","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa","name":"https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.15.0","name":"https://github.com/py-pdf/pypdf/releases/tag/6.15.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-31T21:41:10.272Z"},"source":{"advisory":"GHSA-fc8x-2rww-xw9m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T14:18:26.492095Z","id":"CVE-2026-82398","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-01T14:57:30.866Z"}}]}}}