Vulnerability-Lookup

oesa-2026-3840

Vulnerability from osv_openeuler

Published

2026-09-14 16:34

Modified

2026-09-14 16:34

Summary

rsyslog security update

Details

RSYSLOG is the rocket-fast system for log processing.It offers high-performance, great security features and a modular design. While it started as a regular syslogd, rsyslog has evolved into a kind of swiss army knife of logging, being able to accept inputs from a wide variety of sources, transform them, and output to the results to diverse destinations.

Security Fix(es):

Rsyslog is an open-source log processing system. The replace() function in the RainerScript scripting language has a heap buffer overflow vulnerability due to incorrect calculation of buffer size (CWE-131), leading to a heap-based buffer overflow (CWE-122). An attacker could exploit this vulnerability to cause denial of service or potential code execution.(CVE-2026-78002)

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-78002	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "rsyslog-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-crypto-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-debuginfo-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-debugsource-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-elasticsearch-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-gnutls-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-gssapi-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-hiredis-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-kafka-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmaudit-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmjsonparse-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmkubernetes-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmnormalize-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmsnmptrapd-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mmtaghostname-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mongodb-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-mysql-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-omamqp1-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-pgsql-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-rabbitmq-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-relp-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-snmp-8.2312.0-13.oe2403sp1.aarch64.rpm",
          "rsyslog-udpspoof-8.2312.0-13.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "rsyslog-help-8.2312.0-13.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "rsyslog-8.2312.0-13.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "rsyslog-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-crypto-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-debuginfo-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-debugsource-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-elasticsearch-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-gnutls-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-gssapi-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-hiredis-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-kafka-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmaudit-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmjsonparse-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmkubernetes-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmnormalize-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmsnmptrapd-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mmtaghostname-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mongodb-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-mysql-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-omamqp1-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-pgsql-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-rabbitmq-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-relp-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-snmp-8.2312.0-13.oe2403sp1.x86_64.rpm",
          "rsyslog-udpspoof-8.2312.0-13.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "rsyslog",
        "purl": "pkg:rpm/openEuler/rsyslog\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2312.0-13.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "RSYSLOG is the rocket-fast system for log processing.It offers high-performance, great security features and a modular design. While it started as a regular syslogd, rsyslog has evolved into a kind of swiss army knife of logging, being able to accept inputs from a wide variety of sources, transform them, and output to the results to diverse destinations.\r\n\r\nSecurity Fix(es):\n\nRsyslog is an open-source log processing system. The replace() function in the RainerScript scripting language has a heap buffer overflow vulnerability due to incorrect calculation of buffer size (CWE-131), leading to a heap-based buffer overflow (CWE-122). An attacker could exploit this vulnerability to cause denial of service or potential code execution.(CVE-2026-78002)",
  "id": "OESA-2026-3840",
  "modified": "2026-09-14T16:34:53Z",
  "published": "2026-09-14T16:34:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3840"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78002"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rsyslog security update",
  "upstream": [
    "CVE-2026-78002"
  ]
}

CVE-2026-78002 (GCVE-0-2026-78002)

Vulnerability from cvelistv5 – Published: 2026-08-27 16:12 – Updated: 2026-09-04 09:05

Title

Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 18:29 UTC

CWE

CWE-131 - Incorrect Calculation of Buffer Size

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-78002	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2521135	issue-trackingx_refsource_REDHAT
https://github.com/rsyslog/rsyslog/security/advis…
http://www.openwall.com/lists/oss-security/2026/08/29/1

Impacted products

5 products

Vendor	Product	Version
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 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

Date Public

2026-08-26 00:00

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-78002",
                "options": [
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                  },
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                    "Automatable": "yes"
                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T18:29:21.461066Z",
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    "cna": {
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
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          "packageName": "rsyslog",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
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          "value": "Made public."
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        }
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}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.