CVE-2022-25757
mediumpriority · track · 40EPSS 0.025 · 84 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.8–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- BIT-apisix-2022-25757Apache APISIX: the body_schema check in request-validation plugin can be bypassed2024-03-06vendor · osvUS
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.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2022/03/28/2cnnvd
- https://cxsecurity.com/cveshow/CVE-2022-25757/cnnvd
- https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fvcnnvd
- https://www.cybersecurity-help.cz/vdb/SB2022032805cnnvd
- http://www.openwall.com/lists/oss-security/2022/03/28/2enisa_euvd
- https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fvenisa_euvd
- http://www.openwall.com/lists/oss-security/2022/03/28/2Mailing ListThird Party Advisorynvd
- https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fvMailing ListVendor Advisorynvd
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