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Fencer Vulns
high 7.5

CVE-2026-76763 json

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

published 2026-08-31 2 mo ago modified 2026-10-20 20 d ago also EUVD-2026-68525

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat build of Quarkus 3.27.5.SP1 2.14.2.redhat-00002
  • Red Hat Red Hat build of Quarkus 3.33.3.SP1 2.17.0.redhat-00003

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-76763 updated cvss 7.5

io.smallrye/smallrye-graphql: SmallRye GraphQL: Unauthenticated Denial of Service via large exponent float literals

  • Red Hat build of Quarkus 3.27.5.SP1 smallrye-graphql 2.14.2.redhat-00002
    fixed: vendor fix RHSA-2026:62515
  • Red Hat build of Quarkus 3.33.3.SP1 smallrye-graphql 2.17.0.redhat-00003
    fixed: vendor fix RHSA-2026:62555
  • Red Hat build of Quarkus 3.27.5.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.3.SP1 jna 5.8.0, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, wasm 2.15.3, +1018 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat build of Quarkus 3.27.5.SP1
  • Red Hat Red Hat build of Quarkus 3.33.3.SP1

Classification

Weakness
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.