CVE-2026-115585: high-severity vulnerability in py-pdf pypdf
pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.4%
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.
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%