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CVE-2026-76763— Io.smallrye/smallrye-graphql: smallrye graphql: unauthenticated denial of service via large exponent float literals

Quick assessment

Affected
Red Hat Red Hat build of Quarkus 3.27.5.SP1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SmallRye是Smallrye组织开源的一款MicroProfile(微服务架构优化协议)的实现。 SmallRye存在输入验证错误漏洞，该漏洞源于SmallRye GraphQL中BigInteger数字标量强制转换未正确验证浮点或字符串输入的幅度，可能导致未经身份验证的远程攻击者通过发送包含大指数浮点字面量的GraphQL查询，分配极大BigInteger对象，导致CPU耗尽或内存溢出，造成拒绝服务。

CVSS 7.5 · High EPSS 0.79% · P56

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Red Hat build of Quarkus 3.27.5.SP1 2.14.2.redhat-00002< * unaffected
Red Hat Red Hat build of Quarkus 3.33.3.SP1 2.17.0.redhat-00003< * unaffected
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I. Basic Information for CVE-2026-76763

Vulnerability Information
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Vulnerability Title
Io.smallrye/smallrye-graphql: smallrye graphql: unauthenticated denial of service via large exponent float literals
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in SmallRye GraphQL. The number scalar coercion for BigInteger does not properly validate the magnitude of float or string inputs. An unauthenticated remote attacker can exploit this by sending a GraphQL query containing a large exponent float literal. This can lead to the allocation of extremely large BigInteger objects, causing CPU exhaustion or an OutOfMemoryError, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
SmallRye 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SmallRye是Smallrye组织开源的一款MicroProfile(微服务架构优化协议)的实现。 SmallRye存在输入验证错误漏洞，该漏洞源于SmallRye GraphQL中BigInteger数字标量强制转换未正确验证浮点或字符串输入的幅度，可能导致未经身份验证的远程攻击者通过发送包含大指数浮点字面量的GraphQL查询，分配极大BigInteger对象，导致CPU耗尽或内存溢出，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Quarkus 3.27.5.SP1 2.14.2.redhat-00002 ~ * cpe:/a:redhat:quarkus:3.27
Red Hat Red Hat build of Quarkus 3.33.3.SP1 2.17.0.redhat-00003 ~ * cpe:/a:redhat:quarkus:3.33

II. Public POCs for CVE-2026-76763

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III. Intelligence Information for CVE-2026-76763

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Vendor Advisories for CVE-2026-76763 (4)

Same Patch Batch · Red Hat · 2026-08-31 · 4 CVEs total

CVE-2026-17615 7.5 HIGH Resteasy-core: resteasy sourceprovider remote unauthenticated file read
CVE-2026-81624 7.5 HIGH Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite
CVE-2026-13732 7.0 HIGH Gdb: gdb: out-of-bounds write in stabs parser read_member_functions() via crafted elf

IV. Related Vulnerabilities

Same vendor: Red Hat
Same weakness: CWE-1284

V. Comments for CVE-2026-76763

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