CVE-2026-61449 Grav before 2.0.2 Decompression Bomb via Forged ZIP Size
Attacker can cause disk exhaustion via crafted ZIP archives in Grav CMS due to size cap bypass, requiring admin or package source trust.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-61449?
CVE-2026-61449 is a high-severity denial of service vulnerability in getgrav grav, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-409
Which versions are affected by CVE-2026-61449?
2 open source packages ship an affected version, including getgrav/grav.
| Package | Affected | Fixed in |
|---|---|---|
getgrav/grav Packagist | From 2.0.1 | 2.0.2 |
getgrav/grav Packagist | From 2.0.1 | 2.0.2 |
How do I fix CVE-2026-61449?
Upgrade getgrav/grav to 2.0.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-61449 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61449 exists.
Sources
Also known as CVE-2026-61841, GHSA-8h9x-89f2-m7x3.