{"id":"CVE-2026-48156","aliases":["GHSA-248m-82v9-q6g6","PYSEC-2026-3004"],"url":"https://o3.security/vulnerability/CVE-2026-48156","summary":"pypdf: Possible long runtimes for zero-only width values in cross-reference streams","details":"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.","published":"2026-05-28T14:50:41.829Z","modified":"2026-08-12T03:51:43.089902716Z","cvss":null,"epss":{"score":0.00124,"percentile":0.0241,"asOf":"2026-09-01"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.12.0"}],"fix":{"url":"https://github.com/py-pdf/pypdf/pull/3791","label":"py-pdf/pypdf#3791"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.12.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48156.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48156"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3791"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:43.089902716Z"}}