gRPC Reachable Assertion issue

Answer in brief

CVE-2023-1428 records a High severity (CVSS 7.5) vulnerability in gRPC Reachable Assertion issue. The current sources do not mark it as known exploited. The current feed maps io.grpc:grpc-protobuf (maven), grpcio (pypi), grpc (rubygems). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 6, 2023Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Aug 8, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps io.grpc:grpc-protobuf (maven), grpcio (pypi), grpc (rubygems). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
io.grpc:grpc-protobufmaven	>=1.51.0 <1.53.0	1.53.0
grpciopypi	>=1.51.0 <1.53.0	1.53.0
grpcrubygems	>=1.51.0 <1.53.0	1.53.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for io.grpc:grpc-protobuf, grpcio, grpc.
Review the reported fix. Update io.grpc:grpc-protobuf to 1.53.0; grpcio to 1.53.0; grpc to 1.53.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 6, 2023
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Aug 8, 2026

Sources and claim methodology

Upstream source description

There exists an vulnerability causing an abort() to be called in gRPC. The following headers cause gRPC's C++ implementation to abort() when called via http2: te: x (x != trailers) :scheme: x (x != http, https) grpclb_client_stats: x (x == anything) On top of sending one of those headers, a later header must be sent that gets the total header size past 8KB. We recommend upgrading past git commit 2485fa94bd8a723e5c977d55a3ce10b301b437f8 or v1.53 and above.

Quoted source text, attributed separately from HOL analysis.