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CVE-2026-48156

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cd909e61045545af147072c3d51bc346badf5158a9bc4a0c7dd0bb8878d49aa4
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":"< 6.12.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/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:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-834","description":"CWE-834: Excessive Iteration","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/py-pdf/pypdf/pull/3791","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/pull/3791"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /containers/cna/references/1
{"name":"https://github.com/py-pdf/pypdf/releases/tag/6.12.0","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.12.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /containers/cna/references/2
{"name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a345d73223cbe4b78143b787e2a7dfbec87f8addd6f0287e85b4f0b466d7f969 · sha256:695eb397f608c9d2… · /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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