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CVE-2026-22691

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in versi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:60194b3c9d61087b2de693790626eb816915074c354eead3cc474e58afbd6961
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:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"pypdf","vendor":"py-pdf","versions":[{"status":"affected","version":"< 6.6.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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/E:U","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/metrics/0/cvssV4_0

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:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/references/2
{"name":"https://github.com/py-pdf/pypdf/pull/3594","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/pull/3594"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/references/1
{"name":"https://github.com/py-pdf/pypdf/releases/tag/6.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /containers/cna/references/3
{"name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4452036d869b3478319354866b784833fd621f907854aad04376edda04c1205c · sha256:6223ebd0b067f777… · /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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