6.9

CVE-2026-90472: msgpack-java through 0.9.12 Stack Overflow via Nested Arrays

Deferred
AliasesUBUNTU-CVE-2026-90472DEBIAN-CVE-2026-90472
Published 12-09-2026Last modified 24-09-2026

Vulnerability summary

CVE-2026-90472 is a medium (CVSS 6.9) Uncontrolled Recursion vulnerability in msgpack msgpack-java. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 47% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.57%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 12-09-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

Description

msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.57% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • msgpack-javaAll versions (No fix recorded)
Msgpack1 product
Ubuntu1 product
  • msgpack-javaAll versions (No fix recorded)

3 vendors · 3 products

References

7 links