CVE-2022-25647Network attack vector

Denial of service via internal class deserialization

Published May 1, 2022 · Updated May 27, 2026

Deserialization of untrusted data in Google Gson before 2.8.9 allows remote attackers to interrupt Java applications with crafted object streams. LazilyParsedNumber, LinkedHashTreeMap, and LinkedTreeMap accept direct ObjectInputStream reconstruction even though writeReplace() normally emits safer JDK replacement objects. An application must pass attacker-controlled Java serialization data to ObjectInputStream with an affected Gson class available, and the documented consequence is denial of service.

CVSS severity7.5
High
EPSS probability12.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Google Gson before 2.8.9 allows remote attackers to interrupt Java applications with crafted object streams. LazilyParsedNumber, LinkedHashTreeMap, and LinkedTreeMap accept direct ObjectInputStream reconstruction even though writeReplace() normally emits safer JDK replacement objects. An application must pass attacker-controlled Java serialization data to ObjectInputStream with an affected Gson class available, and the documented consequence is denial of service.

The record

CVE
CVE-2022-25647
Published
May 1, 2022
Updated
May 27, 2026
Vendor
Google
Product
Gson
Classifications
CWE-502, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2022CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=unspecified <2.8.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · Gsonversion=unspecified <2.8.9

Published CVSS scores

7.7SnykCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
7.5NIST National Vulnerability DatabaseCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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