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CVE-2026-78002— Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 rsyslog 中发现了一个缺陷。未经身份验证的远程攻击者可以通过发送特制的 syslog 消息，触发 RainerScript 中 函数中的堆缓冲区溢出。该漏洞源于字符串替换过程中缓冲区大小计算错误，导致内存损坏。成功利用此漏洞可能导致受影响系统的拒绝服务（DoS）。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-78002

Vulnerability Information
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Vulnerability Title
Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-78002

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III. Intelligence Information for CVE-2026-78002

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Vendor Advisories for CVE-2026-78002 (2)

Other References for CVE-2026-78002 (1)

Same Patch Batch · Red Hat · 2026-08-27 · 4 CVEs total

CVE-2026-5680 7.5 HIGH Undertow-core: undertow: denial of service via websocket permessage-deflate processing
CVE-2026-81658 6.5 MEDIUM Foreman: cross-tenant disclosure of template revisions via unauthorized audit lookup
CVE-2026-81668 5.4 MEDIUM Rubygem-katello: cross-tenant content view filter rule access and modification via unautho

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-131

V. Comments for CVE-2026-78002

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