CVE-2026-53430Public exploitNetwork attack vector

Unauthenticated service crash via unbounded gzip decompression

Published Jun 15, 2026 · Updated Jun 15, 2026

Denial of service in elixir-grpc gRPC 0.4.0 through 0.11.5 allows remote attackers to crash gRPC servers via a gzip bomb. GRPC.Compressor.Gzip.decompress/1 passes attacker-controlled bytes to :zlib.gunzip/1 without a decompressed-size limit or incremental decoding, allocating the full output as one binary. Any reachable gRPC endpoint that accepts gzip-compressed requests invokes this path automatically, and one crafted frame can exhaust the BEAM node heap and terminate the service.

CVSS severity8.7
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in elixir-grpc gRPC 0.4.0 through 0.11.5 allows remote attackers to crash gRPC servers via a gzip bomb. GRPC.Compressor.Gzip.decompress/1 passes attacker-controlled bytes to :zlib.gunzip/1 without a decompressed-size limit or incremental decoding, allocating the full output as one binary. Any reachable gRPC endpoint that accepts gzip-compressed requests invokes this path automatically, and one crafted frame can exhaust the BEAM node heap and terminate the service.

The record

CVE
CVE-2026-53430
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
elixir-grpc
Product
gRPC Elixir
Classifications
CWE-409, CAPEC-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.4.0 <1.0.0
  2. Affected versionversion=beae6800fc8baf126f3fe7107d86a50e105275ba <1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

elixir-grpc · gRPC Elixirversion=0.4.0 <1.0.0; version=beae6800fc8baf126f3fe7107d86a50e105275ba <1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc

Published CVSS scores

8.7GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
CAPEC-130Excessive Allocation
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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