CVE-2026-84311
pypdf: Possible long runtimes/large memory usage when extracting XForm objects
MEDIUM 4.8
At a glance
- Source
- NVD
- EPSS
- EPSS 0.14 % · percentile 3 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.
Weaknesses (CWE)
- CWE-834 — Excessive Iteration
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 4.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
| CVSS 4.0 | MEDIUM 4.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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 | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | LOW 3.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-763m-79hh-57f2 — pypdf: Possible long runtimes/large memory usage when extracting XForm objects
- PYSEC-2026-3911 — pypdf: Possible long runtimes/large memory usage when extracting XForm objects
European references
- ENISA EUVD · EUVD-2026-69607
- GCVE · GCVE-0-2026-84311
Affected configurations (NVD CPE)
cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*< 6.16.1
Affected products
| Product | Versions |
|---|---|
| py-pdf · pypdf | affected < 6.16.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |