CVE-2026-91776— jackson-databind 类型ID缓存无界增长漏洞
一分钟漏洞结论
影响对象
FasterXML jackson-databind
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
TypeDeserializerBase._findDeserializer() in FasterXML jackson-databind caches the resolved deserializer under the raw, attacker-supplied type ID. When name-based polymorphism is configured with a fallback, for example @JsonTypeInfo(use = Id.NAME, defaultImpl =
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一、 漏洞 CVE-2026-91776 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
jackson-databind: unbounded growth of the type id cache in TypeDeserializerBase retains every unknown raw type ID
来源: CVE Program / CVE List V5
Vulnerability Description
TypeDeserializerBase._findDeserializer() in FasterXML jackson-databind caches the resolved deserializer under the raw, attacker-supplied type ID. When name-based polymorphism is configured with a fallback, for example @JsonTypeInfo(use = Id.NAME, defaultImpl = ...), every distinct unrecognized type ID resolves to the same fallback deserializer but is retained as its own key in the _deserializers map. That map has no configurable bound and lives for the lifetime of the type deserializer, so an attacker who can repeatedly supply fresh unknown type IDs causes monotonic memory retention across requests. The reporter observed 10,000 retained entries from 10,000 distinct unknown IDs, against a single entry for a control that repeated one unknown ID the same number of times, isolating attacker-controlled key cardinality from request volume. Exploitation requires an application that enables name-based polymorphism with a defaultImpl or equivalent fallback, accepts attacker-influenced type IDs, and reuses a long-lived ObjectMapper across requests. The fix stops caching fallback resolutions for unrecognized IDs and bounds both the number of cached entries and the length of a cacheable type ID.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| FasterXML | jackson-databind | 2.0.0 ~ 2.18.10 | - |
|
| FasterXML | jackson-databind | 3.0.0 ~ 3.1.6 | - |
|
二、漏洞 CVE-2026-91776 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-91776 其他参考 (2)
同批安全公告 · FasterXML · 2026-09-23 · 共 3 条
| CVE-2026-89425 | 7.5 HIGH | jackson-core UTF8解析器内存耗尽漏洞 |
| CVE-2026-91777 | 7.5 HIGH | Jackson-databind反序列化性能拒绝服务 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-91776
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