SB2026092225 - Multiple vulnerabilities in jackson-databind

Description

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2026-91776)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in TypeDeserializerBase._findDeserializer() and its _deserializers cache when processing attacker-influenced unknown type IDs with name-based polymorphism and a configured fallback implementation. A remote attacker can supply distinct unknown type IDs to cause a denial of service.

Exploitation requires reuse of a long-lived mapper or type deserializer across requests.

2) Resource exhaustion (CVE-ID: CVE-2026-91777)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in forward-reference completion in CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the corresponding map implementation when resolving reverse-order object-ID references during deserialization. A remote attacker can submit JSON containing unresolved identity references followed by definitions of the same IDs in reverse order to cause a denial of service.

Exploitation requires the application to deserialize JSON into an identity-enabled collection or map.

Remediation

Install update from vendor's website.

References

• https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-wv8q-qhhj-9h54
• https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24