CVE-2026-102999

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embed…

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.

Vendor: pypdf project
Product: pypdf
CVSS 3.1: 7.5 (high), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0: 8.7 (high), scored by security-advisories@github.comCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
CWE: CWE-400, CWE-407
Published: 2026-09-30
NVD modified: 2026-10-05
NVD status: Analyzed

Not in the CISA KEV catalogue at the last update.

EPSS

0.34% chance of exploitation in the next 30 days (percentile 26th)

FIRST EPSS, updated 17 Oct 2026. About EPSS

CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.

References

github.com (Patch)
github.com (Patch, Issue Tracking)
github.com (Release Notes)
github.com (Vendor Advisory)

Data last updated 18 Oct 2026. Sources: NVD API 2.0, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.