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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.

Rsyslog是rsyslog团队开源的一个速度极快的日志处理管道系统。 Rsyslog存在缓冲区错误漏洞，该漏洞源于rsyslog的RainerScript replace()函数在字符串替换时缓冲区大小计算不正确，导致内存损坏，未经身份验证的远程攻击者可通过发送特制syslog消息触发堆缓冲区溢出，造成拒绝服务。

CVSS 7.5 · High EPSS 0.80% · P56

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:8.2510.0-5.el10_2.2< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:8.2412.0-1.el10_0.2< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 0:8.2102.0-15.el8_10.3< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:8.2510.0-2.el9_8.2< * unaffected
Red Hat Red Hat Update Infrastructure 5 1790241900< * unaffected
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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
Vulnerability Title
Rsyslog 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rsyslog是rsyslog团队开源的一个速度极快的日志处理管道系统。 Rsyslog存在缓冲区错误漏洞，该漏洞源于rsyslog的RainerScript replace()函数在字符串替换时缓冲区大小计算不正确，导致内存损坏，未经身份验证的远程攻击者可通过发送特制syslog消息触发堆缓冲区溢出，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:8.2510.0-5.el10_2.2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:8.2412.0-1.el10_0.2 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 8 0:8.2102.0-15.el8_10.3 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 9 0:8.2510.0-2.el9_8.2 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Update Infrastructure 5 1790241900 ~ * cpe:/a:redhat:rhui:5::el9
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

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 (8)

Same Patch Batch · Red Hat · 2026-08-27 · 6 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-2026-80179 5.9 MEDIUM Jwcrypto: jwcrypto: denial of service via malformed jwe tokens
CVE-2026-81668 5.4 MEDIUM Rubygem-katello: cross-tenant content view filter rule access and modification via unautho
CVE-2026-81893 4.7 MEDIUM Gdk-pixbuf: gdk-pixbuf: invalid write in jpeg icc profile parser on error recovery

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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