CVE-2026-61449 Details
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.
A vulnerability in Grav version 2.0.1 allows for a decompression-bomb size-cap bypass in the ZipArchiver component and the GPM Installer. The issue arises because the size limit, which sums the uncompressed sizes declared in each ZIP entry's central-directory header, can be manipulated by an attacker. Archives that exceed the maximum uncompressed size are supposed to be rejected before extraction, but because the declared sizes can be forged and are not verified against the actual inflated content, a crafted archive can pass the size check. This results in the extraction process filling up disk space or exhausting inodes. The vulnerability can be exploited through archives supplied by a package source or via admin uploads, taking advantage of the trust granted to these sources.
Users can upgrade to Grav version 2.0.2, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 15, 2026CISA-ADP
Assessed Jul 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3 | CISA-ADP | AdvisoryExploitTechnical DescriptionVendor |
| https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3 | [email protected] | AdvisoryExploitTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size | [email protected] | AdvisoryPartial Content |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-409 | Improper Handling of Highly Compressed Data (Data Amplification) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Grav | 2.0.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 15, 2026 | New CVE Received | [email protected] |