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CRITICAL severity

CVE-2021-31649 — jfinal

CRITICAL

CVE-2021-31649 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability in com.jfinal:jfinal. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

JFinal Java Deserialization Vulnerability

Also known asGHSA-h3j8-fr5q-8rfr
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
2 known
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.00%0.77%1.55%2.32%0.4%1.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕com.jfinal:jfinal

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

In applications using jfinal 4.9.08 and below, there is a deserialization vulnerability when using redis,may be vulnerable to remote code execute

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavencom.jfinal:jfinalall versionsNo fix

Affected Products

1 product · 1 configurations
Application
jfinaljfinal
≤ 4.9.08
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

In applications using jfinal 4.9.08 and below, there is a deserializatio…

note.youdao.comNVDJul 2021

Report on note.youdao.com

note.youdao.comNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.jfinal:jfinal, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of com.jfinal:jfinal for CVE-2021-31649. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

In applications using jfinal 4.9.08 and below, there is a deserialization vulnerability when using redis which can lead to remote code execution
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CVE-2021-31649: jfinal RCE (Critical 9.8)