What is GHSA-87M9-RV8P-RGMG?

GHSA-87M9-RV8P-RGMG is a high-severity uncontrolled resource consumption vulnerability in github.com/mostynb/go-grpc-compression (go), affecting versions >= 1.1.4, < 1.2.3. It is fixed in 1.2.3. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.

How severe is GHSA-87M9-RV8P-RGMG?

GHSA-87M9-RV8P-RGMG has a CVSS score of 7.5 (High). 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 github.com/mostynb/go-grpc-compression are affected by GHSA-87M9-RV8P-RGMG?

github.com/mostynb/go-grpc-compression (go) versions >= 1.1.4, < 1.2.3 is affected.

Is there a fix for GHSA-87M9-RV8P-RGMG?

Yes. GHSA-87M9-RV8P-RGMG is fixed in 1.2.3. Upgrade to this version or later.

Is GHSA-87M9-RV8P-RGMG exploitable, and should I be worried?

Whether GHSA-87M9-RV8P-RGMG 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.

What actually determines whether GHSA-87M9-RV8P-RGMG 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-87M9-RV8P-RGMG?

Upgrade github.com/mostynb/go-grpc-compression to 1.2.3 or later.

GHSA-87M9-RV8P-RGMG

Q: How severe is GHSA-87M9-RV8P-RGMG?

GHSA-87M9-RV8P-RGMG has a CVSS score of 7.5 (High). 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.

Q: Which versions of github.com/mostynb/go-grpc-compression are affected by GHSA-87M9-RV8P-RGMG?

github.com/mostynb/go-grpc-compression (go) versions >= 1.1.4, < 1.2.3 is affected.

Q: Is there a fix for GHSA-87M9-RV8P-RGMG?

Yes. GHSA-87M9-RV8P-RGMG is fixed in 1.2.3. Upgrade to this version or later.

Q: Is GHSA-87M9-RV8P-RGMG exploitable, and should I be worried?

Whether GHSA-87M9-RV8P-RGMG 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.

Q: What actually determines whether GHSA-87M9-RV8P-RGMG 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.

Q: How do I fix GHSA-87M9-RV8P-RGMG?

Upgrade github.com/mostynb/go-grpc-compression to 1.2.3 or later.

Summary

go-grpc-compression has a zstd decompression bombing vulnerability

Workarounds

Other compression formats were not affected, users may consider switching from zstd to another format without upgrading to a newer release.

References

This issue was uncovered during a security audit performed by Miroslav Stampar of 7ASecurity, facilitated by OSTIF, for the OpenTelemetry project.

https://opentelemetry.io/blog/2024/cve-2024-36129
https://github.com/open-telemetry/opentelemetry-collector/security/advisories/GHSA-c74f-6mfw-mm4v

Impact

A malicious user could cause a denial of service (DoS) when using a specially crafted gRPC request. The decompression mechanism for zstd did not respect the limits imposed by gRPC, allowing rapid memory usage increases.

Versions v1.1.4 through to v1.2.2 made use of the Decoder.DecodeAll function in github.com/klauspost/compress/zstd to decompress data provided by the peer. The vulnerability is exploitable only by attackers who can send gRPC payloads to users of github.com/mostynb/go-grpc-compression/zstd or github.com/mostynb/go-grpc-compression/nonclobbering/zstd.

Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.

GHSA-87M9-RV8P-RGMG has a CVSS score of 7.5 (High). 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 (1.2.3); upgrading removes the vulnerable code path.

Affected versions

github.com/mostynb/go-grpc-compression (>= 1.1.4, < 1.2.3)

Security releases

github.com/mostynb/go-grpc-compression → 1.2.3 (go)

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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Remediation advice

Version v1.2.3 of github.com/mostynb/go-grpc-compression avoids the issue by not using the Decoder.DecodeAll function in github.com/klauspost/compress/zstd.

All users of github.com/mostynb/go-grpc-compression/zstd or github.com/mostynb/go-grpc-compression/nonclobbering/zstd in the affected versions should update to v1.2.3.

Frequently Asked Questions

What is GHSA-87M9-RV8P-RGMG? GHSA-87M9-RV8P-RGMG is a high-severity uncontrolled resource consumption vulnerability in github.com/mostynb/go-grpc-compression (go), affecting versions >= 1.1.4, < 1.2.3. It is fixed in 1.2.3. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
How severe is GHSA-87M9-RV8P-RGMG? GHSA-87M9-RV8P-RGMG has a CVSS score of 7.5 (High). 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 github.com/mostynb/go-grpc-compression are affected by GHSA-87M9-RV8P-RGMG? github.com/mostynb/go-grpc-compression (go) versions >= 1.1.4, < 1.2.3 is affected.
Is there a fix for GHSA-87M9-RV8P-RGMG? Yes. GHSA-87M9-RV8P-RGMG is fixed in 1.2.3. Upgrade to this version or later.
Is GHSA-87M9-RV8P-RGMG exploitable, and should I be worried? Whether GHSA-87M9-RV8P-RGMG 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-87M9-RV8P-RGMG 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-87M9-RV8P-RGMG? Upgrade github.com/mostynb/go-grpc-compression to 1.2.3 or later.