CVE-2026-19654 (GCVE-0-2026-19654)

Vulnerability from cvelistv5 – Published: 2026-08-12 20:46 – Updated: 2026-09-15 18:29
VLAI
Title
Rsyslog: a configuration-dependent issue in rsyslog's optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 12:58 UTC
CWE
References
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:8.2510.0-5.el10_2.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:8.2412.0-1.el10_0.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.2510.0-2.el9_8.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Date Public
2026-07-22 10:00
Show details on NVD website

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                  "version": "0:8.2510.0-2.el9_8.1",
                  "versionType": "rpm"
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              "cpes": [
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              ],
              "defaultStatus": "unaffected",
              "packageName": "rsyslog",
              "product": "Red Hat Enterprise Linux 6",
              "vendor": "Red Hat"
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              "cpes": [
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              "defaultStatus": "unaffected",
              "packageName": "rsyslog7",
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              "vendor": "Red Hat"
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              "cpes": [
                "cpe:/o:redhat:enterprise_linux:7"
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              "defaultStatus": "unaffected",
              "packageName": "rsyslog",
              "product": "Red Hat Enterprise Linux 7",
              "vendor": "Red Hat"
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              "cpes": [
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              "defaultStatus": "affected",
              "packageName": "rsyslog",
              "product": "Red Hat Enterprise Linux 8",
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          "datePublic": "2026-07-22T10:00:00.000Z",
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              "lang": "en",
              "value": "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."
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                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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                  "description": "Out-of-bounds Read",
                  "lang": "en",
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              "name": "RHSA-2026:66405",
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                "x_refsource_REDHAT"
              ],
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                "x_refsource_REDHAT"
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            },
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              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-19654"
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              "name": "RHBZ#2502868",
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                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502868"
            },
            {
              "url": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-cj5r-wh2m-7w29"
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          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-20T16:56:49.329Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-07-22T10:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Rsyslog: a configuration-dependent issue in rsyslog\u0027s optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd",
          "workarounds": [
            {
              "lang": "en",
              "value": "To mitigate this issue, users that are relying on the imptcp module can implement one of the following options:\n\n1) Remove the framing.delimiter.regex from the affected\n2) Disabled the affected `imptcp` listener or unload `imptcp` if it\u0027s not required\n3) Restrict the network access to the listener to trusted senders only"
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-125: Out-of-bounds Read"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-19654",
        "datePublished": "2026-08-12T20:46:31.853Z",
        "dateReserved": "2026-08-12T18:27:36.578Z",
        "dateUpdated": "2026-09-15T18:29:19.104Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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