GHSA-2rw7-x74f-jg35 — pypdf
Fix: py-pdf/pypdf@f0a462dGHSA-2rw7-x74f-jg35 is a CWE-835 vulnerability in pypdf. A fix is available for pypdf — see the affected versions and patch details below.
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-2rw7-x74f-jg35.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Real-World Exposure
pypdfReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.
Patches
This has been fixed in pypdf==6.7.2.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3655.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | pypdf | all versions | 6.7.2pip install --upgrade 'pypdf==6.7.2' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pypdf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update pypdf to 6.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2rw7-x74f-jg35 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-2rw7-x74f-jg35 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-2rw7-x74f-jg35. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
To exploit this flaw, an attacker must be able to supply a crafted PDF file to be processed by an application using the pypdf library. This issue can cause the application to enter an infinite loop and consume a high amount of CPU resources, eventually resulting in a denial of service with no other security impact.…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift AI 2.25 | rhoai/odh-llama-stack-core-rhel9:1775144403 | RHSA-2026:10184 |
| Red Hat Quay 3.10 | quay/quay-rhel8:1773971077 | RHSA-2026:5665 |
| Red Hat Quay 3.12 | quay/quay-rhel8:1773771962 | RHSA-2026:4942 |
| Red Hat Quay 3.15 | quay/quay-rhel8:1775169219 | RHSA-2026:6568 |
| Red Hat Quay 3.16 | quay/quay-rhel9:1775069491 | RHSA-2026:6497 |
| Red Hat Quay 3.16 | quay/quay-rhel9:1775169226 | RHSA-2026:6567 |
| Red Hat Quay 3.9 | quay/quay-rhel8:1773936323 | RHSA-2026:5168 |
Frequently Asked Questions
Is GHSA-2rw7-x74f-jg35 in your dependencies?
O3 Security finds GHSA-2rw7-x74f-jg35 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.