Vulnerability in Getgrav Grav
CVE-2026-61449
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (21.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.001
Affected products
- Getgrav Grav — versions 0, 2.0.2
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3 (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61449?
- CVE-2026-61449 is a medium-severity vulnerability in Getgrav Grav, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 6.5/10. Published 2026-07-15.
- How severe is CVE-2026-61449?
- Medium severity. CVSS v3 base score is 6.5 out of 10.