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Description

Grav before 2.0.1 contains a decompression bomb vulnerability in ZipArchiver::extract() that lacks limits on uncompressed size, file count, and nesting depth. Attackers can supply a crafted ZIP archive that expands to fill available disk space, causing denial of service by exhausting storage resources.

PUBLISHED Reserved 2026-07-09 | Published 2026-07-10 | Updated 2026-07-10 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem types

Improper Handling of Highly Compressed Data (Data Amplification)

Product status

Default status
unaffected

Any version before 2.0.1
affected

2.0.1 (semver)
unaffected

Credits

alienkeric reporter

References

github.com/...v/grav/security/advisories/GHSA-928x-9mpw-8h56 exploit

github.com/...v/grav/security/advisories/GHSA-928x-9mpw-8h56 (GitHub Security Advisory (GHSA-928x-9mpw-8h56)) vendor-advisory

www.vulncheck.com/...fore-decompression-bomb-via-ziparchiver (VulnCheck Advisory: Grav before 2.0.1 Decompression Bomb via ZipArchiver) third-party-advisory

cve.org (CVE-2026-61455)

nvd.nist.gov (CVE-2026-61455)

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