EUVD-2026-68894
GHSA-fc8x-2rww-xw9m
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible with no authentication or interaction required; quadratic complexity on large non-whitespace input causes near-total worker process unavailability, warranting A:H over A:L.
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4Blast Radius
ecosystem impact- 45 pypi packages depend on pypdf (9 direct, 36 indirect)
Ecosystem-wide dependent count for version 6.15.0.
DescriptionCVE.org
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.
AnalysisAI
Quadratic time complexity in pypdf's read_until_whitespace function allows remote unauthenticated attackers to cause denial of service by supplying a crafted PDF containing a long non-whitespace byte stream. All versions prior to 6.15.0 accumulate bytes via immutable concatenation in a single-byte loop, producing O(N²) processing cost that stalls Python worker processes and degrades availability of any PDF-parsing pipeline exposed to untrusted input. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target application must invoke pypdf to parse attacker-controlled PDF content - specifically any code path reaching `read_until_whitespace` on a crafted stream. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms network-accessible, unauthenticated exploitation with no special attack preconditions, accurately reflecting that any service exposing pypdf-based PDF parsing to user-supplied files is reachable without friction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade pypdf to version 6.15.0 or later, available via PyPI (`pip install 'pypdf>=6.15.0'`) and confirmed at https://github.com/py-pdf/pypdf/releases/tag/6.15.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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View allVendor StatusVendor
SUSE
Severity: ModerateShare
External POC / Exploit Code
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