CVE-2026-119203: high-severity vulnerability in py-pdf pypdf
pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer search
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
py-pdf · pypdfRelated CVEs — py-pdf pypdf
In the same product, most dangerous first.
CVE-2023-36810MEDIUMQuadratic runtime with malformed PDF missing xref marker in pypdfEPSS 0.6%CVE-2026-59936HIGHpypdf: Possible infinite loop for not terminated inline imagesEPSS 0.6%CVE-2026-59935HIGHpypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)EPSS 0.6%CVE-2026-59937MEDIUMpypdf: Possible long runtimes for repeated malformed cross-reference entriesEPSS 0.6%CVE-2023-36807MEDIUMInfinite Loop when reading malformed objects in pypdfEPSS 0.6%CVE-2026-82398MEDIUMpypdf: Inefficient handling of non-whitespace inputs in read_until_whitespaceEPSS 0.5%