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CVE Vulnerabilities

CVE-2026-19654

Out-of-bounds Read

Published: Aug 12, 2026 | Modified: Oct 30, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-19654
CWEhttps://cwe.mitre.org/data/definitions/125.html

A unauthenticated remote peer may lead rsyslogd to crash due to a flaw in the optional imptcp module. A crafted input sequence during oversize-frame recovery can cause an invalid internal message length and terminate rsyslogd. No confidentiality or integrity impact, privilege escalation, or code execution has been identified. imtcp and the default imptcp framing modes are not affected.

Weakness

The product reads data past the end, or before the beginning, of the intended buffer.

Affected Software

NameVendorStart VersionEnd Version
RsyslogRsyslog8.36.0 (including)8.2608.0 (excluding)
Enterprise_linuxRedhat6.0 (including)6.0 (including)
Enterprise_linuxRedhat7.0 (including)7.0 (including)
Enterprise_linuxRedhat8.0 (including)8.0 (including)
Enterprise_linuxRedhat9.0 (including)9.0 (including)
Enterprise_linuxRedhat10.0 (including)10.0 (including)
Red Hat Enterprise Linux 10RedHatrsyslog-0:8.2510.0-5.el10_2.1*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatrsyslog-0:8.2412.0-1.el10_0.1*
Red Hat Enterprise Linux 8RedHatrsyslog-0:8.2102.0-15.el8_10.3*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatrsyslog-0:8.2102.0-7.el8_6.2*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatrsyslog-0:8.2102.0-7.el8_6.2*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatrsyslog-0:8.2102.0-13.el8_8.1*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatrsyslog-0:8.2102.0-13.el8_8.1*
Red Hat Enterprise Linux 9RedHatrsyslog-0:8.2510.0-2.el9_8.1*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatrsyslog-0:8.2102.0-113.el9_2.3*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatrsyslog-0:8.2310.0-4.el9_4.1*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatrsyslog-0:8.2412.0-1.el9_6.2*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1790241900*
RsyslogUbuntujammy*
RsyslogUbuntunoble*
RsyslogUbunturesolute*

Potential Mitigations

  • Assume all input is malicious. Use an “accept known good” input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, “boat” may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as “red” or “blue.”
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code’s environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • To reduce the likelihood of introducing an out-of-bounds read, ensure that you validate and ensure correct calculations for any length argument, buffer size calculation, or offset. Be especially careful of relying on a sentinel (i.e. special character such as NUL) in untrusted inputs.

References

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