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Advisory record · GHSA-xxph-c9ww-hj94

Google Guava: CompactHashMap/CompactHashSet/MapMakerInternalMap deserialization triggers uncontrolled memory allocation

CVSS 8.2 HighEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 27 Oct 2026, 14:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.google.guava:guavaMaven>=4.0, <33.7.233.7.2
Identifiers
GHSA-xxph-c9ww-hj94 · CVE-2026-102554
Weakness (CWE)
CWE-400 · CWE-502 · CWE-770
Tags
Published
27 Oct 2026
Updated
27 Oct 2026

Machine-written summary

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

Guava versions from 4.0 up to but not including 33.7.2 are affected. Deserializing a crafted Java serialized stream containing CompactHashMap, CompactHashSet, CompactLinkedHashMap, CompactLinkedHashSet or MapMakerInternalMap can make the JVM allocate very large arrays from a declared size, causing an OutOfMemoryError and a crash. An attacker who can supply serialized data to an application's ObjectInputStream.readObject() call can trigger this with a small payload. Upgrade to Guava 33.7.2, which contains the fix. The source gives few details on earlier individual releases.

Written 2 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
8.2 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (Google)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.