CVE-2026-61455Public exploitNetwork attack vector

Denial of service via unbounded ZIP extraction

Published Jul 10, 2026 · Updated Jul 10, 2026

Decompression bomb handling in Grav before 2.0.1 allows remote authenticated users to exhaust disk space with a crafted ZIP archive. ZipArchiver::extract() in system/src/Grav/Common/Filesystem/ZipArchiver.php validates entry paths but passes the archive to ZipArchive::extractTo() without limiting expanded size, file count, or nesting depth. Exploitation requires a third-party plugin or custom code to route attacker-controlled ZIP data through this otherwise unused first-party extraction path, and a shared web-root partition can make the site unavailable.

CVSS severity7.1
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Decompression bomb handling in Grav before 2.0.1 allows remote authenticated users to exhaust disk space with a crafted ZIP archive. ZipArchiver::extract() in system/src/Grav/Common/Filesystem/ZipArchiver.php validates entry paths but passes the archive to ZipArchive::extractTo() without limiting expanded size, file count, or nesting depth. Exploitation requires a third-party plugin or custom code to route attacker-controlled ZIP data through this otherwise unused first-party extraction path, and a shared web-root partition can make the site unavailable.

The record

CVE
CVE-2026-61455
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-409, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=0 <2.0.1

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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