CVE-2026-91777— Jackson-databind反序列化性能拒绝服务
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。
Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveF
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一、 漏洞 CVE-2026-91777 基础信息
漏洞信息
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Vulnerability Title
jackson-databind: quadratic forward-reference completion in Collection and Map deserializers
来源: CVE Program / CVE List V5
Vulnerability Description
Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer. When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure.
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 | 2.5.0 ~ 2.18.10 | - |
|
| FasterXML | jackson-databind | 3.0.0 ~ 3.1.6 | - |
|
二、漏洞 CVE-2026-91777 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-91777 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-2026-91776 | 7.5 HIGH | jackson-databind 类型ID缓存无界增长漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-91777
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