CVE detail
CVE-2026-59933
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the OLE reader follows sector chains from attacker-controlled XLS/OLE metadata without detecting cycles or enforcing a maximum chain length. A tiny malformed .xls/OLE file can set the small-block depot sector chain to point back to itself. During normal XLS detection, OLERead::read() appends the same sector data repeatedly until the PHP process exhausts memory. This is reachable from Reader\Xls::canRead() and therefore from automatic spreadsheet type detection. Applications that accept attacker-controlled spreadsheet uploads can suffer denial of service from a very small file. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 20.8 · diversity 5.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 7
- within the 30d window
- Peak daily
- 7
- highest bucket
Evidence
Source links by recency
7 source links · newest first
No excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PMNo excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PMNo excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PMNo excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PMNo excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PMNo excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PM- https://github.com/PHPOffice/PhpSpreadsheet/commit/85f2556b0bf5269061bf45932ecda8a128d81750github.com
No excerpt available.
Exploitgithub.comJul 28, 2026, 6:17 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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