go-grpc-compression has a zstd decompression bombing vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

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. Patches 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. Workarounds Other compression formats were not affected, users may consider switching…

Published by the source

10 Jun 2024, 18:36 UTC

Last modified by the source

17 Jun 2024, 15:27 UTC

Source last checked

26 Oct 2026, 15:04 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-87m9-rv8p-rgmg

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# Patch Next advisory brief: GHSA-87m9-rv8p-rgmg

Advisory: go-grpc-compression has a zstd decompression bombing vulnerability
IDs: GHSA-87m9-rv8p-rgmg
Record: https://patchnext.com/advisories/ghsa-87m9-rv8p-rgmg (revision 1, source checked 26 Oct 2026, 15:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/mostynb/go-grpc-compression 1.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/mostynb/go-grpc-compression: affected >= 1.1.4, < 1.2.3; fixed in 1.2.3

## Suggested inspection (read-only)
- Go github.com/mostynb/go-grpc-compression: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/mostynb/go-grpc-compression.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-87m9-rv8p-rgmg (GitHub-reviewed advisory GHSA-87m9-rv8p-rgmg lists affected ranges: Go github.com/mostynb/go-grpc-compression >=1.1.4 <1.2.3)

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