CVE-2026-84311
published 2026-09-01CVE-2026-84311: 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…
PriorityP411low3.3CVSS 3.1
AVLACLPRNUIRSUCNINAL
EPSS
0.14%
2.7th percentile
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.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-25 | lightspeed-chatbot-rhel8 | — | — |
| exploit-intelligence-tech-preview | vulnerability-analysis-rhel9 | — | — |
| lightspeed-core | lightspeed-stack-rhel9 | — | — |
| lightspeed-core | rag-tool-cpu-rhel9 | — | — |
| lightspeed-core | rag-tool-cuda-12.9-rhel9 | — | — |
| openshift-lightspeed-tech-preview | lightspeed-rag-tool-rhel9 | — | — |
| openshift-lightspeed | lightspeed-ocp-rag-rhel9 | — | — |
| py-pdf | pypdf | < 6.16.1 | 6.16.1 |
| pypdf_project | pypdf | < 6.16.1 | 6.16.1 |
| pypdf_project | pypdf | >= 0 < 6.16.1 | 6.16.1 |
| quay | quay-rhel8 | — | — |
| quay | quay-rhel9 | — | — |
| rhelai3 | bootc-cuda-rhel9 | — | — |
| rhelai3 | bootc-gaudi-rhel9 | — | — |
| rhelai3 | bootc-rocm-rhel9 | — | — |
| rhelai3 | disk-image-cuda-rhel9 | — | — |
| rhoai | odh-llama-stack-core-rhel9 | — | — |
| rhoai | odh-ogx-core-rhel9 | — | — |
CVSS provenance
nvdv3.13.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
nvdv4.04.8MEDIUMCVSS: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
vendor_redhat4.8MEDIUM
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GHSA
pypdf: Possible long runtimes/large memory usage when extracting XForm objects
ghsa·2026-09-01
CVE-2026-84311 [MEDIUM] CWE-834 pypdf: Possible long runtimes/large memory usage when extracting XForm objects
pypdf: Possible long runtimes/large memory usage when extracting XForm objects
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires extracting the text of a page with lots of XForm objects, where some of them might be re-used.
### Patches
This has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).
VulDB
py-pdf pypdf up to 6.16.0 Form XObject pypdf/_page.py PageObject._extract_text resource consumption
vuldb·2026-09-01·CVSS 4.8
CVE-2026-84311 [MEDIUM] py-pdf pypdf up to 6.16.0 Form XObject pypdf/_page.py PageObject._extract_text resource consumption
A vulnerability classified as problematic was found in py-pdf pypdf up to 6.16.0. Impacted is the function PageObject._extract_text of the file pypdf/_page.py of the component Form XObject. The manipulation results in resource consumption.
This vulnerability was named CVE-2026-84311. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is advised.
Red Hat
pypdf: pypdf: Denial of Service via crafted PDF XForm objects
vendor_redhat·2026-09-01·CVSS 4.8
CVE-2026-84311 [MEDIUM] CWE-770 pypdf: pypdf: Denial of Service via crafted PDF XForm objects
pypdf: pypdf: Denial of Service via crafted PDF XForm objects
A flaw was found in pypdf, a pure-python PDF library. A remote attacker can exploit this vulnerability by crafting a malicious PDF document containing specially structured XForm objects. Processing this document can lead to excessive iteration, causing the application to consume significant memory and CPU resources, resulting in a Denial of Service (DoS).
Package: exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 (Exploit Intelligence) - Out of support scope
Package: lightspeed-core/lightspeed-stack-rhel9 (Lightspeed Core) - Fix deferred
Package: lightspeed-core/rag-tool-cpu-rhel9 (Lightspeed Core) - Fix deferred
Package: lightspeed-core/rag-tool-cuda-12.9-rhel9 (Lightspeed Core) - Fix deferred
Package: opensh
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-84311 python-PyPDF2: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
bugzilla·2026-09-03·CVSS 4.8
CVE-2026-84311 [MEDIUM] CVE-2026-84311 python-PyPDF2: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
CVE-2026-84311 python-PyPDF2: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-84311 python-pypdf: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
bugzilla·2026-09-03·CVSS 4.8
CVE-2026-84311 [MEDIUM] CVE-2026-84311 python-pypdf: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
CVE-2026-84311 python-pypdf: pypdf: Denial of Service via crafted PDF XForm objects [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-84311 pypdf: pypdf: Denial of Service via crafted PDF XForm objects
bugzilla·2026-09-01·CVSS 4.8
CVE-2026-84311 [MEDIUM] CVE-2026-84311 pypdf: pypdf: Denial of Service via crafted PDF XForm objects
CVE-2026-84311 pypdf: pypdf: Denial of Service via crafted PDF XForm objects
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.
2026-09-01
Published