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Fencer Vulns
medium 5.9

CVE-2026-88763 json

Skupper-router: skupper-router: unbounded recursion in amqp field parser leads to denial of service

published 2026-09-10 1 mo ago modified 2026-10-13 26 d ago also EUVD-2026-75288

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

A flaw was found in the skupper-router component of Red Hat Service Interconnect, which is used to provide secure communication between distributed services. The issue occurs when the router processes a specially crafted network message using its AMQP field parser. Due to a lack of bounds on recursion during parsing, the router can run out of stack memory and crash, leading to a denial of service for the interconnected network.

Patch / fix

  • Red Hat Service Interconnect 2 for RHEL 8 0:3.5.3-1.el8
  • Red Hat Service Interconnect 2 for RHEL 9 0:3.5.3-1.el9, 3.5.3-1
  • skupper-router service interconnect 2.0 3.5.3-1.el8
  • skupper-router service interconnect 2.0 3.5.3-1.el9
  • skupper-router-tools service interconnect 2.0 3.5.3-1.el8
  • skupper-router-tools service interconnect 2.0 3.5.3-1.el9
  • skupper-router-common service interconnect 2.0 3.5.3-1.el8
  • skupper-router-common service interconnect 2.0 3.5.3-1.el9

red hat advisories RHSA-2026:82316

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-2026-88763 updated cvss 5.9

skupper-router: skupper-router: Unbounded recursion in AMQP field parser leads to denial of service

  • Red Hat Service Interconnect 2 skupper-router 3.5.3-1.el9, skupper-router-tools 3.5.3-1.el9, skupper-router-common 3.5.3-1.el9, service-interconnect/skupper-router-rhel9 3.5.3-1 Red Hat Service Interconnect 2 for RHEL 8 skupper-router 3.5.3-1.el8, skupper-router-tools 3.5.3-1.el8, skupper-router-common 3.5.3-1.el8
    fixed: vendor fix RHSA-2026:82316
  • Red Hat Service Interconnect 2 skupper-cli 2.2.3-1.el9, service-interconnect/skupper-cli-rhel9 2.2.3-1, service-interconnect/skupper-operator-bundle 2.2.3-1, service-interconnect/service-controller-rhel9 2.2.3-1, service-interconnect/skupper-controller-rhel9 2.2.3-1, service-interconnect/skupper-kube-adaptor-rhel9 2.2.3-1, +4 more Red Hat Service Interconnect 2 for RHEL 8 skupper-cli 2.2.3-1.el8
    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
56 d ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Service Interconnect 2 for RHEL 8
  • Red Hat Service Interconnect 2 for RHEL 9

Classification

Weakness

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.