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Fastjson CVEs

2 CVEs, 1 exploited, 1 protected by Waratek

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Overview 2 matches · 1 protected · 1 exploited · 0 CISA KEV · 0 EPSS ≥ 0.5

2matches 1protected50.0% 1exploited50.0% 0CISA KEV0.0% 0EPSS ≥ 0.50.0%

Protected by Waratek 1 50.0% Rule in development 0 0.0% Mitigation candidate 1 50.0% No exploit published 0 0.0%

Critical 2 100.0% High 0 0.0% Medium 0 0.0% Low 0 0.0% None 0 0.0% Unknown 0 0.0%

blocked by ARMR today 1 50.0% partly blocked 0 0.0% not blocked 1 50.0% not established 0 0.0% unrecorded 0 0.0%

Exploited 1 50.0% Working exploit published 0 0.0% Proof of concept only 1 50.0% Forecast only 0 0.0% No public exploit 0 0.0%

split by StatusSeverityProtectionExploit maturity peak 1 / quarter

Q2 221 Mitigation candidate1 Critical1 not blocked1 Proof of concept only1 Q3 220 Q4 220 Q1 230 Q2 230 Q3 230 Q4 230 Q1 240 Q2 240 Q3 240 Q4 240 Q1 250 Q2 250 Q3 250 Q4 250 Q1 260 Q2 260 Q3 261 Protected by Waratek1 Critical1 blocked by ARMR today1 Exploited1

Q3 22Q1 23Q3 23Q1 24Q3 24Q1 25Q3 25Q1 26Q3 26

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CVE	Severity	Published▾	Status	Exploitation	Description
CVE-2026-16723	Critical	2026-07-23	Protected by Waratek	Exploited	A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.
CVE-2022-25845	Critical	2022-06-10	Mitigation candidate	Proof of concept only	The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassing the default autoType shutdown restrictions, which is possible under certain conditions. Exploiting this vulnerability allows attacking remote servers. Workaround: If upgrading is not possible, you can enable [safeMode](https://github.com/alibaba/fastjson/wiki/fastjson_safemode).

CVE

Severity

Published▾

Status

Exploitation

Description

CVE-2026-16723

Critical

2026-07-23

Protected by Waratek

Exploited

A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.

CVE-2022-25845

Critical

2022-06-10

Mitigation candidate

Proof of concept only

The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassing the default autoType shutdown restrictions, which is possible under certain conditions. Exploiting this vulnerability allows attacking remote servers. Workaround: If upgrading is not possible, you can enable [safeMode](https://github.com/alibaba/fastjson/wiki/fastjson_safemode).