getgrav Grav up to 2.0.1 ZipArchiver extractTo size unrestricted upload

Summaryinfo

A vulnerability classified as problematic was found in getgrav Grav up to 2.0.1. Affected by this vulnerability is the function extractTo of the component ZipArchiver. The manipulation of the argument size results in unrestricted upload. This vulnerability is reported as CVE-2026-61449. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in getgrav Grav up to 2.0.1. It has been classified as problematic. Affected is the function extractTo of the component ZipArchiver. The manipulation of the argument size with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-61449 since 07/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

Upgrading to version 2.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• getgrav

Name

• Grav

Version

• 2.0.0
• 2.0.1

Website

• Product: https://github.com/getgrav/grav/

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