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    CVE-2026-82398

    pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.

    Published:Aug 31, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 31, 2026
    EPSS Score:0.00301
    CVSS Score:5.3

    Affected Products

    Vendor
    Py-pdf
    Product
    Pypdf

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-71852 (CVSS 4.8) — pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtime…
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    CVE-2026-59937 (CVSS 6.9) — pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with rep…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High