CVE-2026-48802

Summary (CVE-2026-48802, python-engineio): Before v4.13.2, a heartbeat-driven background thread could be created on new connections or PONG handling, causing DoS especially on synchronous servers. The fix in v4.13.2 changes the behavior so that the initial heartbeat background thread/async task i...

CVE-2026-48802

python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection ...

aibro (>=0.5.5, <=1.1.5), aioambient (>=0.1.1, <=1.2.2) +231 more potentially affected by CVE-2026-48802 via python-engineio (>=3.2.2, <=4.13.1)

python-engineio PYPI version =3.2.2, =0.5.5, =0.1.1, =0.1.1, =4.0.6, =0.16.0, =2.3.0, =1.0.5, =0.9.0, =0.0.3, =4.0.2, =4.0.0.8, =0.1.0, =0.1.5 - baseweb 0.0.5 and more Source cves: CVE-2026-48802 Source advisory: MEND:CVE-2026-48802...

CVE-2026-48802

python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection ...

EUVD-2026-56854

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809 python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809 python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809 python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809

CVE-2026-48809 – python-engineio : The issue affects the python-engineio server prior to version 4.13.2, where the size of incoming messages could be loaded into memory before validation, enabling potential DoS through excessive memory allocation. Two configurations are affected: POST requests wi...

CVE-2026-48809

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

aibro (>=0.5.5, <=1.1.5), aioambient (>=0.1.1, <=1.2.2) +231 more potentially affected by CVE-2026-48809 via python-engineio (>=3.2.2, <=4.13.1)

python-engineio PYPI version =3.2.2, =0.5.5, =0.1.1, =0.1.1, =4.0.6, =0.16.0, =2.3.0, =1.0.5, =0.9.0, =0.0.3, =4.0.2, =4.0.0.8, =0.1.0, =0.1.5 - baseweb 0.0.5 and more Source cves: CVE-2026-48809 Source advisory: MEND:CVE-2026-48809...

CVE-2026-48809

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48809: Allocation of Resources Without Limits or Throttling

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take...

CVE-2026-48802: Allocation of Resources Without Limits or Throttling

python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection ...

Security update for python-python-engineio

This update for python-python-engineio fixes the following issues: CVE-2026-48802: remote user can cause the creation of unnecessary background threads in the server through the heartbeat mechanism and cause a DoS bsc1269544. CVE-2026-48809: size of incoming messages is not checked before they ar...

PYSEC-2026-3033 python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

Impact There are two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases...

PYSEC-2026-3032 python-engineio has unbound thread allocation that can cause denial of service

Impact An attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet. Note: this issue primarily affects synchronous...

python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

ImpactThere are two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases...

aioambient (0.1.1) potentially affected by CVE-2026-48802 via python-engineio (3.2.2)

python-engineio PYPI version 3.2.2 is affected by a known vulnerability. The following packages have a transitive dependency on python-engineio and may be impacted: - aioambient 0.1.1 Source cves: CVE-2026-48802 Source advisory: OSV:PYSEC-2026-3032...