CVE-2026-55556— Rsyslog imhttp插件堆溢出漏洞
一分钟漏洞结论
影响对象
rsyslog rsyslog
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。
Rsyslog is a rocket-fast system for log processing. From 8.2110.0 until 8.2604.0, the optional imhttp module's parse_auth_header function in contrib/imhttp/imhttp.c allocates a zero-byte heap buffer with calloc(0, len) when an HTTP Basic Authorization value ex
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一、 漏洞 CVE-2026-55556 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
Rsyslog: Heap buffer overflow in imhttp plugin Basic Authentication handling
来源: CVE Program / CVE List V5
Vulnerability Description
Rsyslog is a rocket-fast system for log processing. From 8.2110.0 until 8.2604.0, the optional imhttp module's parse_auth_header function in contrib/imhttp/imhttp.c allocates a zero-byte heap buffer with calloc(0, len) when an HTTP Basic Authorization value exceeds its fixed work buffer, then passes that pointer to apr_base64_decode. An unauthenticated remote attacker can send an oversized encoded credential to an imhttp endpoint configured for Basic Authentication, causing decoded data to overwrite adjacent heap memory before credential validation. Deployments that do not install, load, and use imhttp with Basic Authentication are not affected. The demonstrated impact is a process crash that interrupts log collection, and code execution has not been demonstrated. This issue is fixed in version 8.2604.0.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-55556 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
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CVE-2026-55556 补丁与修复 (1)
CVE-2026-55556 厂商页面 (1)
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Release rsyslog 8.2604.0 · rsyslog/rsyslog · GitHub x_refsource_MISC
CVE-2026-55556 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-55556
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