CVE-2026-55057: Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

mediumCVSS 5.5CVE-2026-55057

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.5
Published: 2026-07-14
Last updated: 2026-07-16
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55057

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-2026-550570.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55057	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl
unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl
unknownMultiple vulnerabilities in Microsoft Office (July 15, 2026)cert-fr-avis
unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
mediumCVE-2026-55057: Microsoft Office Information Disclosure Vulnerabilitymsrc

Recent advisories for Integer overflow or

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.

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highCVE-2026-17881: Integer overflow in WebXR in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to…nvd · 2026-07-30
criticalCVE-2026-17848: Integer overflow in Codecs in Google Chrome prior to 151.0.7922.72 allowed a remote attacker t…nvd · 2026-07-30
criticalCVE-2026-17726: Integer overflow in WebGL in Google Chrome on Android prior to 151.0.7922.72 allowed a remote …nvd · 2026-07-30