CVE-2022-25757 Apache APISIX: the body_schema check in request-validation plugin can be bypassed
Attackers can bypass request validation in Apache APISIX by exploiting JSON duplicate key handling differences between the gateway and upstream services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-25757?
CVE-2022-25757 is a critical vulnerability in Apache APISIX, published on 28 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Apache APISIX before 2.13.0, when decoding JSON with duplicate keys, lua-cjson will choose the last occurred value as the result. By passing a JSON with a duplicate key, the attacker can bypass the body_schema validation in the request-validation plugin. For example, `{"string_payload":"bad","string_payload":"good"}` can be used to hide the "bad" input. Systems satisfy three conditions below are affected by this attack: 1. use body_schema validation in the request-validation plugin 2. upstream application uses a special JSON library that chooses the first occurred value, like jsoniter or gojay 3. upstream application does not validate the input anymore. The fix in APISIX is to re-encode the validated JSON input back into the request body at the side of APISIX. Improper Input Validation vulnerability in __COMPONENT__ of Apache APISIX allows an attacker to __IMPACT__. This issue affects Apache APISIX Apache APISIX version 2.12.1 and prior versions.
Weakness: CWE-20
Which versions are affected by CVE-2022-25757?
1 open source package ship an affected version, including apisix. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apisix Bitnami | All versions | 2.13.0 |
Products include Apache Apisix.
How do I fix CVE-2022-25757?
Upgrade apisix to 2.13.0 or later.
Is CVE-2022-25757 being exploited?
There is no known exploitation of CVE-2022-25757 in the wild and no public exploit code.
Other vulnerabilities in Apache APISIX
- CVE-2022-24112 Apache APISIX Authentication Bypass
- CVE-2026-31908 Apache APISIX: forward auth plugin allows header injection
- CVE-2026-75005 Apache APISIX: Unauthenticated CPU-exhaustion DoS
- CVE-2025-27446 Privilege escalation in Apache APISIX Java Plugin Runner
- CVE-2026-31923 Apache APISIX: Openid-connect `tls_verify` field is disabled by default
Sources
Also known as BIT-apisix-2022-25757, GHSA-9xhv-qfpf-p2xx.