GHSA-87mj-5ggw-8qc3 — pypdf
Fix: py-pdf/pypdf#3693GHSA-87mj-5ggw-8qc3 is a CWE-835 vulnerability in pypdf. A fix is available for pypdf — see the affected versions and patch details below.
pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-87mj-5ggw-8qc3.
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 a file in non-strict mode.
Patches
This has been fixed in pypdf==6.9.2.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3693.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | pypdf | all versions | 6.9.2pip install --upgrade 'pypdf==6.9.2' |
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 6.9.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-87mj-5ggw-8qc3 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-87mj-5ggw-8qc3 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-87mj-5ggw-8qc3. 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.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift AI 2.25 | rhoai/odh-llama-stack-core-rhel9:1783701598 | RHSA-2026:42644 |
| Red Hat OpenShift AI 3.3 | rhoai/odh-llama-stack-core-rhel9:1782471587 | RHSA-2026:37275 |
Frequently Asked Questions
Is GHSA-87mj-5ggw-8qc3 in your dependencies?
O3 Security finds GHSA-87mj-5ggw-8qc3 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.