Common Weakness Enumeration

CWE-502

Allowed

Deserialization of Untrusted Data

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

2664 vulnerabilities reference this CWE, most recent first.

CVE-2026-43825 (GCVE-0-2026-43825)

Vulnerability from cvelistv5 – Published: 2026-07-06 15:42 – Updated: 2026-07-06 20:38
VLAI
Title
Apache OpenNLP :: Core :: ML :: LibSVM: Unsafe Java Deserialization in SvmDoccatModel
Summary
Untrusted Java Deserialization in Apache OpenNLP SvmDoccatModel Versions Affected:   before 3.0.0-M4 (libsvm document categorization module; introduced in   OPENNLP-1808 and only present on the 3.x line) Description: SvmDoccatModel.deserialize(InputStream) reads an attacker-controlled stream with java.io.ObjectInputStream and calls readObject() without an ObjectInputFilter installed. ObjectInputStream materialises every class referenced in the stream before the resulting object is cast to SvmDoccatModel, so the cast that follows readObject() executes only after the foreign object graph has already been deserialised in full. If a Java deserialization gadget chain is available on the consumer's classpath, a crafted payload supplied to deserialize() executes arbitrary code in the JVM that loads it. Apache OpenNLP itself does not ship a known gadget chain, so the realistic risk is to downstream applications that embed the libsvm module alongside vulnerable transitive dependencies. The method is public and static, so any caller can pass an untrusted stream to it directly. The practical impact is remote code execution against processes that load SvmDoccatModel instances from untrusted or semi-trusted origins. Mitigation: 3.x users should upgrade to 3.0.0-M4. Users who cannot upgrade immediately should treat all serialized SvmDoccatModel streams as untrusted input unless their provenance is verified, and should avoid invoking SvmDoccatModel.deserialize() on streams supplied by end users or fetched from third-party sources without integrity checks.
Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 19:11 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
apache CNA
References
Impacted products
Credits
Subramanian S
Show details on NVD website
To clipboard 

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CVE-2026-43642 (GCVE-0-2026-43642)

Vulnerability from cvelistv5 – Published: 2026-09-22 17:53 – Updated: 2026-10-01 19:19
VLAI
Title
Softaculous Virtualizor PHP Object Injection via Billing Module Handler
Summary
Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains a PHP object injection vulnerability in the billing module handler that allows unauthenticated remote attackers to supply arbitrary serialized PHP objects for deserialization by setting the act parameter to login with the from_billing_module parameter present. Attackers can pass malicious serialized data through the billing_data POST field to the unserialize() function without allowed_classes restrictions, enabling exploitation of available POP chains to achieve remote code execution as root.
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 23:54 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
Softaculous Virtualizor Affected: 0 , < 3.2.9 (Patch 9) (custom)
Unaffected: 3.0.0 (semver)
    cpe:2.3:a:softaculous:virtualizor:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-01 00:00
Credits
Valentin Lobstein (Chocapikk) VulnCheck
Show details on NVD website
To clipboard 

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CVE-2026-43633 (GCVE-0-2026-43633)

Vulnerability from cvelistv5 – Published: 2026-05-19 13:29 – Updated: 2026-11-08 14:03 X_Open Source
VLAI
Title
HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal
Summary
HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with the web terminal feature enabled.
Severity
9.5 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-19 13:59 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
hestiacp hestiacp Affected: 1.9.0 , ≤ 1.9.4 (semver)
Unaffected: 854d71b3c1737b0a0d0cc55c926008ffe1f6719b (git)
Create a notification for this product.
Date Public
2026-03-09 00:00
Credits
sutol divinity76
Show details on NVD website
To clipboard 

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CVE-2026-42779 (GCVE-0-2026-42779)

Vulnerability from cvelistv5 – Published: 2026-05-01 10:00 – Updated: 2026-05-02 03:55
VLAI
Title
Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)
Summary
The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description: Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed. The fix checks if the class is present in the accepted class filter before calling Class.forName(). Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6. The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-01 00:00 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
apache CNA
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache MINA Affected: 2.2.X , ≤ 2.2.6 (semver)
Affected: 2.1.X , ≤ 2.1.11 (semver)
Create a notification for this product.
Credits
Venkatraman Kumar, Securin
Show details on NVD website
To clipboard 

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CVE-2026-42778 (GCVE-0-2026-42778)

Vulnerability from cvelistv5 – Published: 2026-05-01 10:01 – Updated: 2026-05-02 03:55
VLAI
Title
Apache MINA: CWE-502 Deserialization of Untrusted Data (take 2)
Summary
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Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-01 00:00 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
apache CNA
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache MINA Affected: 2.2.X , ≤ 2.2.6 (semver)
Affected: 2.1.X , ≤ 2.1.11 (semver)
Create a notification for this product.
Credits
Venkatraman Kumar, Securin
Show details on NVD website
To clipboard 

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CVE-2026-42723 (GCVE-0-2026-42723)

Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
Title
WordPress CleanSkin theme <= 1.5.0 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in CleanSkin <= 1.5.0 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
AncoraThemes CleanSkin Affected: n/a , ≤ 1.5.0 (custom)
Create a notification for this product.
Credits
João Pedro S Alcântara (Kinorth) | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-42719 (GCVE-0-2026-42719)

Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 12:13
VLAI
Title
WordPress Dynamic User Directory plugin <= 2.4 - PHP Object Injection vulnerability
Summary
Subscriber PHP Object Injection in Dynamic User Directory <= 2.4 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:56 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
Sarah Giles Dynamic User Directory Affected: n/a , ≤ 2.4 (custom)
Create a notification for this product.
Credits
Hiro (Code016Hiro) | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-42718 (GCVE-0-2026-42718)

Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
Title
WordPress Booster for WooCommerce plugin <= 8.4.0 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Booster for WooCommerce <= 8.4.0 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
Pluggabl Booster for WooCommerce Affected: n/a , ≤ 8.4.0 (custom)
Create a notification for this product.
Credits
John Ryan Albon | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-42716 (GCVE-0-2026-42716)

Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
Title
WordPress Payever - WooCommerce Gateway plugin <= 4.8.2 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Payever - WooCommerce Gateway <= 4.8.2 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
payever Payever - WooCommerce Gateway Affected: n/a , ≤ 4.8.2 (custom)
Create a notification for this product.
Credits
Lee chul woong | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-42701 (GCVE-0-2026-42701)

Vulnerability from cvelistv5 – Published: 2026-10-29 15:24 – Updated: 2026-10-30 18:50
VLAI
Title
WordPress YayMail plugin <= 4.4.6 - PHP Object Injection vulnerability
Summary
Shop manager PHP Object Injection in YayMail <= 4.4.6 versions.
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 18:38 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
YayCommerce YayMail Affected: n/a , ≤ 4.4.6 (custom)
Create a notification for this product.
Credits
Ananda Dhakal (Patchstack) | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
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    "assignerShortName": "Patchstack",
    "cveId": "CVE-2026-42701",
    "datePublished": "2026-10-29T15:24:00.414Z",
    "dateReserved": "2026-04-29T09:05:07.700Z",
    "dateUpdated": "2026-10-30T18:50:04.609Z",
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Mitigation
Architecture and Design Implementation

If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.

Mitigation
Implementation

When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.

Mitigation
Implementation

Explicitly define a final object() to prevent deserialization.

Mitigation
Architecture and Design Implementation
  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Mitigation
Implementation

Avoid having unnecessary types or gadgets (a sequence of instances and method invocations that can self-execute during the deserialization process, often found in libraries) available that can be leveraged for malicious ends. This limits the potential for unintended or unauthorized types and gadgets to be leveraged by the attacker. Add only acceptable classes to an allowlist. Note: new gadgets are constantly being discovered, so this alone is not a sufficient mitigation.

Mitigation
Architecture and Design Implementation

Employ cryptography of the data or code for protection. However, it's important to note that it would still be client-side security. This is risky because if the client is compromised then the security implemented on the client (the cryptography) can be bypassed.

Mitigation MIT-29
Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

CAPEC-586: Object Injection

An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

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