8.7

CVE-2026-103000: py-pdf pypdf Uncontrolled Resource Consumption

CVSS: 8.7v4.0HighAnalyzed
AliasesGHSA-w23x-9jrw-r45cPYSEC-2026-4160UBUNTU-CVE-2026-103000
Published 30-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-103000 is a high (CVSS 8.7) Uncontrolled Resource Consumption vulnerability in py-pdf pypdf. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.34%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

01-10-202620-10-2026
EPSS score
0.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • pypdfAll versions (No fix recorded)
  • pypdf2All versions (No fix recorded)
Chainguard1 product
  • open-webui< 0.11.4-r3
Debian1 product
  • pypdfAll versions (No fix recorded) | < 6.19.0-1
Py-pdf1 product
Pypdf_project1 product
PyPI1 product
  • pypdf< 6.19.0
Wolfi1 product
  • open-webui< 0.11.4-r3

7 vendors · 8 products

References

11 links
Show all 11 references