● Covered by 1 source · 1 reportMedium impact1 neutral
Go 1.27 Introduces New JSON APIs: encoding/json/v2 and encoding/json/jsontext
Key points
- New encoding/json/v2 and encoding/json/jsontext packages are stable in Go 1.27.
- Addresses issues in the original encoding/json package.
- New APIs enforce valid UTF-8, rejecting invalid characters.
- New APIs reject JSON objects with duplicate member names.
New JSON APIs in Go 1.27
Go 1.27 now includes the stable and generally available encoding/json/v2 and encoding/json/jsontext packages. These new APIs are the result of an experimental effort to improve JSON handling in Go, incorporating user feedback and refinements since their initial announcement last year.
The introduction of these packages aims to resolve various behavioral flaws and limitations present in the original encoding/json package, which has been part of the Go standard library since before Go 1.0.
Addressing Behavioral Flaws
The original encoding/json package, while flexible, exhibited several behavioral flaws. These included imprecise handling of JSON syntax, such as accepting invalid UTF-8 and objects with duplicate member names. The new APIs rectify these issues.
Specifically, encoding/json/v2 and encoding/json/jsontext now require valid UTF-8, aligning with RFC 8259, and will report errors for invalid UTF-8 instead of silent data corruption. They also reject JSON objects containing duplicate member names, which can prevent security vulnerabilities like CVE-2017-12635 and ensure a universally agreed-upon meaning for JSON values.
Impact on JSON Processing
These changes mean that Go programs using the new JSON APIs will have stricter parsing behavior, leading to more robust and secure JSON processing. Developers will benefit from clearer error reporting for malformed JSON, reducing the likelihood of unexpected behavior or data integrity issues.
The update reflects an evolution in JSON standardization, where decoders are becoming stricter to ensure consistent interpretation across different implementations and to mitigate potential security risks associated with ambiguous inputs.
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Primary sources
GitHub kubernetes/kube-openapi GitHub go-json-experiment/jsonbench GitHub go-json-experiment/json GitHub golang/go CVE CVE-2017-126359.8 CRITICALReporting from
Go 1.27 has released new stable JSON APIs, encoding/json/v2 and encoding/json/jsontext, which address long-standing issues in the original encoding/json package. These new packages offer stricter handling of JSON syntax, including valid UTF-8 enforcement and rejection of duplicate member names, to improve security and interoperability.