---
id: GHSA-v626-428r-43p8
title: >-
  Duplicate Advisory: Grav: Decompression-bomb size cap bypassed by forged ZIP
  size in ZipArchiver/Installer
summary: >-
  Duplicate Advisory: Grav: Decompression-bomb size cap bypassed by forged ZIP
  size in ZipArchiver/Installer
severity: high
cvss: 6.5
cwe:
  - CWE-409
vendor: getgrav
product: getgrav/grav
ecosystem: composer
affected:
  - getgrav/grav = 2.0.1
published: '2026-07-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T14:53:19Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-v626-428r-43p8'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61449'
  - url: >-
      https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size
  - url: 'https://github.com/advisories/GHSA-v626-428r-43p8'
tags:
  - ghsa
  - composer
ingestedAt: '2026-09-17T15:20:39.004Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-8h9x-89f2-m7x3. This link is maintained to preserve external references.

### Original Description
Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry's ZIP central-directory header (ZipArchive::statIndex()['size']) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56.

## Affected packages

- `getgrav/grav = 2.0.1`

## Remediation

Refer to the advisory for the patched release.