CVE-2026-48987 pyLoad: Unbounded Memory Growth Leading to DoS and Potential DDoS in EventManager
An authenticated user can cause unbounded memory growth in pyLoad by submitting unique UUIDs, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48987?
CVE-2026-48987 is a medium-severity denial of service vulnerability in pyload, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, EventManager in src/pyload/core/managers/event_manager.py appends a Client object to the clients list for each unique uuid submitted to the authenticated getEvents API endpoint, but get_events does not invoke the available clean method to remove inactive clients. An authenticated user can repeatedly submit unique UUID values, causing retained client objects and process memory to grow without bound even after requests stop. The resulting memory exhaustion can trigger an operating-system out-of-memory termination of pyLoad or host-wide instability and denial of service. This issue is fixed in version 0.5.0b3.dev101.
Which versions are affected by CVE-2026-48987?
3 open source packages ship an affected version, including pyload-ng.
| Package | Affected | Fixed in |
|---|---|---|
pyload-ng PyPI | All versions to 0.5.0b3.dev100 | None |
pyload-ng PyPI | All versions to 0.5.0b3.dev100 | None |
pyload-ng PyPI | All versions to 0.5.0b3.dev100 | None |
How do I fix CVE-2026-48987?
No fix has been published for CVE-2026-48987 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-48987 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48987 exists.
Sources
Also known as GHSA-c2f9-4mc8-j656, PYSEC-2026-2992.