CVE-2026-90473CWE-190

CVE-2026-90473

Medium · published September 12, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
34.3
In the wild
Unconfirmed
What it is

msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00412 · 34.3th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-09-12T15:16Z
References (4)
https://github.com/msgpack/msgpack-java · [email protected]https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581 · [email protected]https://github.com/msgpack/msgpack-java/issues/1014 · [email protected]https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32 · [email protected]
EPSS history
Timeline
  • 14 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 12 SEP 11:06Z
    msgpack-java through 0.9.12 Integer Overflow via MAP32
    cvelistv5