# CVE-2026-90715: marcobambini Gravity integer overflow in JSON parser

Source: https://junglewise.ai/threats/cve-2026-90715-marcobambini-gravity-integer-overflow-in-json-parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-90715 · Severity: high · CVSS 7.3 · Published 2026-09-14

Gravity is a programming language runtime that includes a JSON parser for deserializing data. An integer overflow vulnerability in the JSON parser allows remote attackers to cause a denial of service (SIGILL crash) or data corruption by providing JSON input with excessively long digit sequences in numeric literals.

## Quick answers

**Is CVE-2026-90715 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90715 being exploited in the wild.

**How severe is CVE-2026-90715?** High severity, with a CVSS score of 7.3, published 14 September 2026.

**Which products and versions are affected?** marcobambini Gravity up to 0.9.7.

**Is there a fix for CVE-2026-90715?** A patch was published on 2026-09-14: Version 0.9.8 released with fix (commit 9b337c3eae5833c3956bed1fc01c21c14fd443f2) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-90715 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-90715?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a signed 64-bit integer overflow (CWE-190) in the vendored udp json-parser component, specifically in the json_parse_ex function within src/utils/gravity_json.c at line 1126. The parser accumulates integer values digit-by-digit using the formula (accumulator * 10) + digit_value, which overflows when processing JSON integers with more than 19 significant decimal digits. The same unchecked pattern exists in the exponent accumulator. The integer overflow is undefined behavior in C and triggers SIGILL in sanitized builds, while non-sanitized builds may silently store corrupted values. Attack vectors include direct calls to json_parse() API and indirect calls through gravity_vm_loadbuffer() when deserializing untrusted compiled bytecode. The vulnerability was patched in version 0.9.8 (commit 9b337c3eae5833c3956bed1fc01c21c14fd443f2).

## Affected products

- marcobambini Gravity up to 0.9.7

## Timeline

- 2026-08-04: disclosed: Issue #447 opened on GitHub
- 2026-09-14: patched: Version 0.9.8 released with fix (commit 9b337c3eae5833c3956bed1fc01c21c14fd443f2)
- 2026-09-14: advisory: CVE-2026-90715 published

## References

- [https://github.com/marcobambini/gravity/](https://github.com/marcobambini/gravity/)
- [https://github.com/marcobambini/gravity/issues/447](https://github.com/marcobambini/gravity/issues/447)