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Advisory record · GHSA-f9qc-qg88-7pq5

Buffa Vulnerable to Memory Exhaustion Denial of Service in decode_unknown_field via Unbounded Allocation

CVSS 6.3 MediumEPSS 0.0076 · 55th percentile

Published by the GitHub Advisory Database at 28 Aug 2026, 18:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
buffacrates.io<0.8.00.8.0
Identifiers
GHSA-f9qc-qg88-7pq5 · CVE-2026-55407
Weakness (CWE)
CWE-400 · CWE-770 · CWE-789
Tags
Published
28 Aug 2026
Updated
28 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Buffa versions before 0.8.0 are vulnerable to memory exhaustion in the decode_unknown_field function, which allocates memory in proportion to unknown fields in untrusted protobuf input without an allocation budget. An unauthenticated attacker can send a small crafted payload to any message decoded with code generated using preserve_unknown_fields=true (the default), causing a large heap allocation that can crash the process. Upgrade to buffa 0.8.0, which enforces per-message unknown field count limits, or set preserve_unknown_fields=false in generated code.

Written 8 Nov 2026.

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

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0076, the 55th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:18 UTC First seen by agentprime
  2. 31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

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.