CVE-2023-43642Public exploitNetwork attack vector

Application crash via oversized chunk allocation

Published Sep 25, 2023 · Updated Sep 24, 2024

Denial of service in Xerial snappy-java 1.1.10.3 and earlier allows remote attackers to crash dependent applications via crafted input. SnappyInputStream accepts an untrusted positive chunkSize without an upper-bound check and expands its compressed-data heap buffer to that size, triggering OutOfMemoryError. Exposure requires a dependent application to pass attacker-controlled compressed data to SnappyInputStream; JVM ExitOnOutOfMemoryError or CrashOnOutOfMemoryError settings can terminate its process.

CVSS severity7.5
High
EPSS probability1.04%
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 Xerial snappy-java 1.1.10.3 and earlier allows remote attackers to crash dependent applications via crafted input. SnappyInputStream accepts an untrusted positive chunkSize without an upper-bound check and expands its compressed-data heap buffer to that size, triggering OutOfMemoryError. Exposure requires a dependent application to pass attacker-controlled compressed data to SnappyInputStream; JVM ExitOnOutOfMemoryError or CrashOnOutOfMemoryError settings can terminate its process.

The record

CVE
CVE-2023-43642
Published
Sep 25, 2023
Updated
Sep 24, 2024
Vendor
Xerial
Product
snappy-java
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=< 1.1.10.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Xerial · snappy-javaversion=< 1.1.10.4

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

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Technologies

Your stack

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Your stack

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