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Fencer Vulns
high 8.2

CVE-2026-118664 json

decode-uri-component: Denial of service via quadratic replacement of percent-encoded runs

published 2026-10-28 11 d ago modified 2026-10-29 10 d ago also GHSA-qr28-fpjm-wq7f , EUVD-2026-112471

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

decode-uri-component provides a more robust alternative to decodeURIComponent. Prior to 0.5.1, decodeUriComponent in index.js falls back to customDecodeURIComponent after native decoding throws, and the fallback collects every distinct percent-encoded run before performing a full-string regular-expression replacement for each entry. Malformed input containing many distinct runs can therefore make both the number of replacements and the scanned input length grow together, causing quadratic CPU consumption and blocking the Node.js event loop; request-body inputs can reach the demonstrated size, while ordinary URL header limits reduce the practical delay. This issue is fixed in version 0.5.1.

Patch / fix

  • npm decode-uri-component 0.5.1

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-2026-118664 updated cvss 7.5

decode-uri-component: decode-uri-component: Denial of Service via malformed percent-encoded input

  • Red Hat OpenShift Serverless openshift-serverless-1/logic-rhel9-operator Red Hat Ceph Storage 4 rhceph/rhceph-4-dashboard-rhel8 Red Hat OpenShift AI (RHOAI) rhoai/odh-feature-server-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9 Red Hat Quay 3 quay/quay-rhel8
    +1 more products
    Red Hat Satellite 6 satellite/iop-vulnerability-frontend-rhel9
    affected: no fix available
  • Red Hat OpenShift distributed tracing 3.11 rhosdt/tempo-jaeger-query-rhel9 1793703190
    fixed: vendor fix RHSA-2026:94580
  • Red Hat build of Apache Camel for Spring Boot 4 rhaf-camel-spring-boot-maven-repository.zip 4.18.4.CS6, rhaf-camel-for-springboot-maven-repository.zip 3.5.16.CS2 Red Hat Ceph Storage 9 libarrow, parquet-libs Red Hat Enterprise Linux 8 pcs, cockpit, grafana, pcs-snmp, cockpit-ws, cockpit-pcp, +21 more Red Hat Enterprise Linux 9 pcs, grafana, pcs-snmp, grafana-selinux, grafana 12.4.3-2.el10 Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10 Red Hat Fuse 7 redhat-fuse-sources.zip 7.13.0, redhat-fuse-maven-repository.zip 7.13.0, fuse-karaf.fuse-7_13_0-00012-redhat-00001.zip 7.13.0
    +4 more products
    Red Hat Hardened Images yarnpkg 1.22.22-18.1.hum1, grafana12.4 12.4.13-0.5.hum1 Red Hat JBoss Enterprise Application Platform 7 jboss-eap-patch.zip 7.4.23, jboss-eap-maven-repository.zip 7.4.23, jboss-eap-runtime-maven-repository.zip 7.4.25, jboss-eap-full-maven-repository.zip 7.4.22.GA-CR1, jboss-eap-incremental-maven-repository.zip 7.4.23 Red Hat OpenShift distributed tracing 3.11 rhosdt/tempo-rhel9 1793703190, rhosdt/tempo-query-rhel9 1793703177, rhosdt/tempo-gateway-rhel9 1793703126, rhosdt/tempo-rhel9-operator 1793703152, rhosdt/tempo-operator-bundle 1793705434, rhosdt/tempo-gateway-opa-rhel9 1793703125 Red Hat Single Sign-On 7 rh-sso-server-dist.zip 7.6.13
    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
no
Technical impact
partial
Assessed
10 d ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
npm decode-uri-component
<0.5.1
0.5.1

Affected products

  • SamVerschueren decode-uri-component

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-407 Inefficient Algorithmic Complexity

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.