Medium severity · published Jul 15, 2026
CVE-2026-61449
Grav before 2.0.2 Decompression Bomb via Forged ZIP Size
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
before 2.0.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-61449
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-61449
vendor-advisory
https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3
third-party-advisory
https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size
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