CVE-2026-59932: 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, an

highCVSS 7.5CVE-2026-59932

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 Gnumeric reader reads attacker-supplied .gnumeric files into memory and, when the file starts with gzip magic bytes, calls gzdecode() on the full compressed contents without enforcing a decompressed-size limit. A very small compressed .gnumeric file can expand to data larger than the PHP memory limit and crash the process during Gnumeric::canRead() before the file is rejected or fully parsed. This is reachable through normal file-type detection and Gnumeric loading paths, so applications that accept attacker-controlled spreadsheet uploads can suffer denial of service. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-07-28
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59932

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-599320.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59932	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highGHSA-2mrg-gjxq-2gvr: PHPSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustionghsa

Recent advisories for PhpSpreadsheet is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-59933: PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.…nvd · 2026-07-28
highCVE-2026-59931: PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.…nvd · 2026-07-28
highGHSA-xh5m-36r6-47m3: PHPSpreadsheet: XLS/OLE sector-chain self-loop causes memory exhaustionghsa · 2026-07-23
highGHSA-2mrg-gjxq-2gvr: PHPSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustionghsa · 2026-07-23
highGHSA-6hq5-7373-42rg: PHPSpreadsheet: SSRF bypass via HTTP redirect in WEBSERVICE() domain whitelistghsa · 2026-07-23