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CVE-2026-71884— Packet CTR计数器耗尽后报告完整成功长度

一分钟漏洞结论

影响对象
Legion of the Bouncy Castle Inc. BC-LTS-JAVA
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。

以下是该漏洞描述信息的中文翻译： 在 Java 长期支持版（LTS）的 Bouncy Castle 2.73.13 版本之前，原生的单次（one-shot）CTR 分组密码未检查所请求的输入长度是否超出 IV（初始化向量）所允许的计数器范围。 在 CTR 模式下，IV 和分组计数器共享同一个 16 字节的块。因此，当 IV 长度为 13 至 15 字节时，剩余的计数器长度仅为 1 至 3 字节，分别只能寻址 256、65536 或 16777216 个分组。如果输入数据过长，计数器会发生回绕（wrap），导致密钥流

CVSS 8.2 · High
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一、 漏洞 CVE-2026-71884 基础信息

漏洞信息
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Vulnerability Title
Packet CTR reports a full success length after the counter is exhausted
来源: CVE Program / CVE List V5
Vulnerability Description
In Bouncy Castle for Java LTS before 2.73.13, the native one-shot CTR packet cipher did not check that the requested input length fitted the counter space the IV left. In CTR mode the IV and the block counter share one 16-byte block, so an IV of 13 to 15 bytes leaves a counter of only 1 to 3 bytes, addressing 256, 65536 or 16777216 blocks respectively. Given a longer input the counter wrapped and the keystream repeated from the start of the same packet, and the call then returned the full input length as though every byte had been correctly transformed. Two segments of the message were therefore encrypted under the same keystream, so their plaintexts can be recovered from the ciphertext alone, without the key, while the caller saw neither an exception nor a short length to indicate it. The streaming implementation validates at init and again while processing, and the portable AESCTRPacketCipher rejects such a request with "Counter in CTR/SIC mode out of range.", but the native one-shot path has a single entry point and performed no counter-range validation there. It now preflights the IV-derived counter range and rejects an over-long request before any output is written, so the operation is failure-atomic and never reports success for bytes it did not correctly transform. A counter of four bytes or more cannot be exhausted by a Java int length and is unaffected, as is a full 16-byte IV, where the counter range is the caller's responsibility. Bouncy Castle for Java (bcprov) is not affected, as it ships no native implementations.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
来源: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.4 ~ 2.73.13 -

二、漏洞 CVE-2026-71884 的公开POC

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三、漏洞 CVE-2026-71884 的情报信息

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CVE-2026-71884 概念验证 (1)

IV. Related Vulnerabilities

Same product: BC-LTS-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-323

V. Comments for CVE-2026-71884

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