Summary
Generated code can read and write out of bounds in safe code
Code generated by flatbuffers' compiler is unsafe but not marked as such.
See https://github.com/google/flatbuffers/issues/6627 for details.
All users that use generated code by flatbuffers compiler are recommended to:
- not expose flatbuffer generated code as part of their public APIs
- audit their code and look for any usage of
follow,push, or any method that uses them
(e.g.self_follow). - Carefuly go through the crates' documentation to understand which "safe" APIs are not
intended to be used.
Impact
GHSA-3JCH-9QGP-4844 has a CVSS score of 9.8 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (22.9.29); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-3JCH-9QGP-4844? GHSA-3JCH-9QGP-4844 is a critical-severity security vulnerability in flatbuffers (rust), affecting versions < 22.9.29. It is fixed in 22.9.29.
- How severe is GHSA-3JCH-9QGP-4844? GHSA-3JCH-9QGP-4844 has a CVSS score of 9.8 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of flatbuffers are affected by GHSA-3JCH-9QGP-4844? flatbuffers (rust) versions < 22.9.29 is affected.
- Is there a fix for GHSA-3JCH-9QGP-4844? Yes. GHSA-3JCH-9QGP-4844 is fixed in 22.9.29. Upgrade to this version or later.
- Is GHSA-3JCH-9QGP-4844 exploitable, and should I be worried? Whether GHSA-3JCH-9QGP-4844 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-3JCH-9QGP-4844 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-3JCH-9QGP-4844? Upgrade
flatbuffersto 22.9.29 or later.