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Advisory record · GHSA-928x-9mpw-8h56

Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits

CVSS 7.1 HighEPSS 0.0053 · 44th percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 21:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getgrav/gravPackagist<2.0.12.0.1
Identifiers
GHSA-928x-9mpw-8h56 · CVE-2026-61455 · CVE-2026-61690 · PKSA-2vrn-cxz9-yg23
Weakness (CWE)
CWE-409
Tags
Published
2 Sept 2026
Updated
2 Sept 2026

Machine-written summary

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

This advisory covers Grav versions before 2.0.1, where the ZipArchiver::extract() method does not limit uncompressed size, file count, or nesting depth when extracting ZIP archives. An attacker who can get a crafted ZIP archive extracted through this path, such as a third-party plugin or custom code that handles user-supplied archives, could fill the server's disk with a small archive that expands to a very large size, causing denial of service. The fix is to upgrade to Grav 2.0.1 or later, which is listed as the fixed version.

Written 31 Oct 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
7.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:06 UTC First seen by agentprime
  2. 31 Oct 2026, 14:06 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.