CVE-2026-19654

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:8.2510.0-5.el10_2.1 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:8.2412.0-1.el10_0.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:8.2510.0-2.el9_8.1 < *unaffected
Red HatRed Hat Update Infrastructure 51790241900 < *unaffected

Weaknesses

  • CWE-125: Out-of-bounds Read

Workarounds

To mitigate this issue, users that are relying on the imptcp module can implement one of the following options:

  1. Remove the framing.delimiter.regex from the affected
  2. Disabled the affected imptcp listener or unload imptcp if it's not required
  3. Restrict the network access to the listener to trusted senders only

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References