gRPC Erlang package has unbounded gzip decompression (decompression bomb)

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0043, the 37th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:25 UTC First seen by agentprime
2. 31 Oct 2026, 15:25 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-6ccx-9c9f-327w
• OSV: GHSA-6ccx-9c9f-327w
• github.com/elixir-grpc/grpc/security/advisories/GHSA-6ccx-9c9f-327w
• nvd.nist.gov/vuln/detail/CVE-2026-53430
• github.com/elixir-grpc/grpc/pull/543
• github.com/elixir-grpc/grpc/commit/1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc
• cna.erlef.org/cves/CVE-2026-53430.html
• github.com/elixir-grpc/grpc
• github.com/elixir-grpc/grpc/releases/tag/v1.0.0
• osv.dev/vulnerability/EEF-CVE-2026-53430

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.