CVE-2026-61449 PUBLISHED

Grav before 2.0.2 Decompression Bomb via Forged ZIP Size

Assigner: VulnCheck
Reserved: 09.07.2026 Published: 15.07.2026 Updated: 15.07.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.1

Product Status

Vendor getgrav
Product grav
Versions Default: unaffected
  • affected from 0 to 2.0.2 (excl.)
  • Version 2.0.2 is unaffected

Credits

  • iliaal reporter

References

Problem Types

  • Improper Handling of Highly Compressed Data (Data Amplification) CWE