Alta

Excessive Iteration in gRPC

Publicada: 09.08.2023
Actualizado: 11.10.2026 13:19

gRPC contains a vulnerability that allows hpack table accounting errors could lead to unwanted disconnects between clients and servers in exceptional cases/ Three vectors were found that allow the following DOS attacks:

Unbounded memory buffering in the HPACK parser
Unbounded CPU consumption in the HPACK parser

The unbounded CPU consumption is down to a copy that occurred per-input-block in the parser, and because that could be unbounded due to the memory copy bug we end up with an O(n^2) parsing loop, with n selected by the client.

The unbounded memory buffering bugs:

The header size limit check was behind the string reading code, so we needed to first buffer up to a 4 gigabyte string before rejecting it as longer than 8 or 16kb.
HPACK varints have an encoding quirk whereby an infinite number of 0’s can be added at the start of an integer. gRPC’s hpack parser needed to read all of them before concluding a parse.
gRPC’s metadata overflow check was performed per frame, so that the following sequence of frames could cause infinite buffering: HEADERS: containing a: 1 CONTINUATION: containing a: 2 CONTINUATION: containing a: 3 etc…

Software afectado

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Plataforma	Paquete	Versiones vulnerables	Corregida en
Python (PyPI)	grpcio	< 1.53.2, >= 1.54.0, < 1.54.3, >= 1.55.0, < 1.55.2, >= 1.56.0, < 1.56.2	1.53.2, 1.54.3, 1.55.2, 1.56.2

Referencias

Puntuación CVSS 7.5/10

Vector CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Debilidad (CWE): CWE-770, CWE-789
Plataforma: Python (PyPI)
Paquete: grpcio
Publicada: 09.08.2023
Actualizado: 11.10.2026 13:19

Fuentes y licencias

OSV / GitHub Advisory Database - PYSEC-2026-1424 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-496j-2rq6-j6cc - CC BY 4.0

Historial de vulnerabilidades: grpcio

Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Entradas en total: 6
Primera → última: 04.2017 09.2023
Sin corrección: 0
Explotada en ataques: 0

Distribución por gravedad

Alta 4
Media 1
Sin evaluar 1

Divulgaciones por año

2017: 1
2018: 0
2019: 0
2020: 0
2021: 0
2022: 0
2023: 5
2024: 0
2025: 0
2026: 0

13.09.2023

Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)

Alta · 7.5 CVE-2023-4785 >= 1.55.0, < 1.55.3, >= 1.54.0, < 1.54.3, >= 1.53.0, < 1.53.2 1.55.3, 1.54.3, 1.53.2
09.08.2023

Excessive Iteration in gRPC esta entrada

Alta · 7.5 CVE-2023-33953 < 1.53.2, >= 1.54.0, < 1.54.3, >= 1.55.0, < 1.55.2, >= 1.56.0, < 1.56.2 1.53.2, 1.54.3, 1.55.2, 1.56.2
06.07.2023

gRPC connection termination issue

Media · 5.3 CVE-2023-32732 >= 1.53.0, < 1.53.1, >= 1.54.0, < 1.54.2 1.53.1, 1.54.2
06.07.2023

gRPC Reachable Assertion issue

Alta · 7.5 CVE-2023-1428 >= 1.51.0, < 1.53.0 1.53.0
05.07.2023

Connection confusion in gRPC

Alta · 7.4 CVE-2023-32731 >= 1.53.0, < 1.53.1, >= 1.54.0, < 1.54.2 1.53.1, 1.54.2
30.04.2017

Google gRPC before 2017-03-29 has an out-of-bounds write caused by a heap-based use-after-free related to the grpc_call_destroy function in core/lib/surface/call.c.

Sin evaluar CVE-2017-8359 < 1.3.0 1.3.0

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