CVE-2026-59933

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 30.7% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Deferred. NVD last modified this record on 2026-07-30.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-28 17:29Z1 MO AGO

Last updated

2026-07-28 17:57Z1 MO AGO

Reserved

2026-07-07

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.2

Document digest

acbfae94d85ad6a45bd3b8c131e4d9e9543d3110315c555738afc93bd43900bc

• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-xh5m-36r6-47m3x_refsource_CONFIRM
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/commit/85f2556b0bf5269061bf45932ecda8a128d81750x_refsource_MISC
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.6x_refsource_MISC
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.18x_refsource_MISC
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.7x_refsource_MISC
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.7x_refsource_MISC
• github.comhttps://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.8.1x_refsource_MISC