CVE-2026-91776 FasterXML jackson-databind - Denial of Service

FasterXML jackson-databind contains a memory retention vulnerability caused by caching fallback deserializers for unrecognized type IDs in name-based polymorphism with defaultImpl, letting attackers cause memory exhaustion, exploit requires attacker-controlled type IDs and long-lived ObjectMapper.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to the latest version that stops caching fallback resolutions and bounds cache size.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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