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CVE-2026-59937

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f51136478e57763037f868ab576590972c8b8c5e3fe331904cf22a84550ffe73
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"pypdf","vendor":"py-pdf","versions":[{"status":"affected","version":"< 6.14.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/references/2
{"name":"https://github.com/py-pdf/pypdf/pull/3887","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/pull/3887"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/references/1
{"name":"https://github.com/py-pdf/pypdf/releases/tag/6.14.0","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.14.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /containers/cna/references/3
{"name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:890c3a78f6a6eeca9347d6b6d9a9bbeabb7274b95c2ef3de0ce553d63e63eb47 · sha256:b5d270c2dc30dc87… · /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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