CVE-2026-102993

highpriority · track · 30EPSS 0.003 · 28 %ileUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.35% (28th) EPSS
CVSS 7.5 · high
Is it mine?
2 products
Check your exposure
Who says so?
2 sources
osv · nvd

EPSS · scored 2026-10-28

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.

01

cvss

Technical severity, 0–10. One row per scoring source.

8.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v4.08.7highCVSS: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:Xsecondary · security-advisories@github.com
v4.06.6mediumCVSS: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:U/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:Xsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-770USCWE-770US
04

affected products (2)

Products and version ranges known to be affected.

05

advisories (2)

Vendor and ecosystem advisories describing this.

  • GHSA-qv6h-rv94-w285pypdf: Possible large memory usage when retrieving Roman page labels2026-10-01ghsa · osvUS

    ### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large Roman numerals. ### Patches This has been fixed in [pypdf==6.17.0](https://github.com/py-pdf/pypdf/releases/tag/6.17.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4047](https://github.com/py-pdf/pypdf/pull/4047).

  • PYSEC-2026-4158pypdf: Possible large memory usage when retrieving Roman page labels2026-10-01vendor · osvUS

    ### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large Roman numerals. ### Patches This has been fixed in [pypdf==6.17.0](https://github.com/py-pdf/pypdf/releases/tag/6.17.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4047](https://github.com/py-pdf/pypdf/pull/4047).

06

also known as (2)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

osvnvdNVDCVE.orgMITRE
published 2026-09-30modified 2026-10-02
08

references (4) nvd

External citations — patches, advisories, analysis.

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