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Fencer Vulns
high 8.6

CVE-2026-61551 json

Icinga 2: Stack overflow via deeply nested JSON objects

published 2026-09-18 51 d ago modified 2026-09-24 45 d ago also EUVD-2026-83209

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

Icinga 2 is an open source monitoring system. Prior to 2.14.9, 2.15.4, and 2.16.2, parsing deeply nested JSON can exhaust the call stack because nesting depth is not bounded. The affected JSON parsing paths are reachable by unauthenticated network clients through the Icinga 2 service on TCP port 5665, allowing a remote attacker to crash the process, while possible code execution has not been demonstrated. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.

Patch / fix

  • icinga icinga 2.14.9, 2.15.4, 2.16.2
  • icinga2 Debian 13 2.14.6-1+deb13u1
  • icinga2 Debian 14 2.16.2-1

debian advisories DEBIAN-CVE-2026-61551

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
45 d ago

Exploit prediction

0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

  • Icinga icinga2

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.