CVE-2026-78002
Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
02 Description
Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 1.06% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 64.4% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-10-26.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-08-27 16:12Z2 MO AGO
- Last updated
- 2026-10-26 16:10Z2 DAYS AGO
- Reserved
- 2026-08-21
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-131Incorrect Calculation of Buffer SizeBase
- Data version
- 5.2
- Document digest
- 5baba8ca370677053267cefff6e896569a75479a39a4cd8580c755f37a2947ce
05 Affected products
06 References
- access.redhat.comRHSA-2026:69540https://access.redhat.com/errata/RHSA-2026:69540
- access.redhat.comRHSA-2026:69541https://access.redhat.com/errata/RHSA-2026:69541
- access.redhat.comRHSA-2026:71603https://access.redhat.com/errata/RHSA-2026:71603
- access.redhat.comRHSA-2026:80817https://access.redhat.com/errata/RHSA-2026:80817
- access.redhat.comRHSA-2026:81321https://access.redhat.com/errata/RHSA-2026:81321
- access.redhat.comRHSA-2026:84576https://access.redhat.com/errata/RHSA-2026:84576
- access.redhat.comRHSA-2026:86124https://access.redhat.com/errata/RHSA-2026:86124
- access.redhat.comRHSA-2026:87408https://access.redhat.com/errata/RHSA-2026:87408
- access.redhat.comRHSA-2026:90349https://access.redhat.com/errata/RHSA-2026:90349
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-78002
- bugzilla.redhat.comRHBZ#2521135https://bugzilla.redhat.com/show_bug.cgi?id=2521135
- github.comhttps://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/08/29/1
07 Fixed in
AlmaLinux 8
- rsyslog Fixed in 8.2102.0-15.el8_10.3
- rsyslog-crypto Fixed in 8.2102.0-15.el8_10.3
- rsyslog-doc Fixed in 8.2102.0-15.el8_10.3
- rsyslog-elasticsearch Fixed in 8.2102.0-15.el8_10.3
- rsyslog-gnutls Fixed in 8.2102.0-15.el8_10.3
- rsyslog-gssapi Fixed in 8.2102.0-15.el8_10.3
- rsyslog-kafka Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmaudit Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmfields Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmjsonparse Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmkubernetes Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmnormalize Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmsnmptrapd Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mysql Fixed in 8.2102.0-15.el8_10.3
- rsyslog-omamqp1 Fixed in 8.2102.0-15.el8_10.3
- rsyslog-openssl Fixed in 8.2102.0-15.el8_10.3
- rsyslog-pgsql Fixed in 8.2102.0-15.el8_10.3
- rsyslog-relp Fixed in 8.2102.0-15.el8_10.3
- rsyslog-snmp Fixed in 8.2102.0-15.el8_10.3
- rsyslog-udpspoof Fixed in 8.2102.0-15.el8_10.3
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- rsyslog Fixed in 8.2510.0-2.el9_8.2
- rsyslog-crypto Fixed in 8.2510.0-2.el9_8.2
- rsyslog-doc Fixed in 8.2510.0-2.el9_8.2
- rsyslog-elasticsearch Fixed in 8.2510.0-2.el9_8.2
- rsyslog-gnutls Fixed in 8.2510.0-2.el9_8.2
- rsyslog-gssapi Fixed in 8.2510.0-2.el9_8.2
- rsyslog-kafka Fixed in 8.2510.0-2.el9_8.2
- rsyslog-logrotate Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmaudit Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmfields Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmjsonparse Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmkubernetes Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmnormalize Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmsnmptrapd Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mysql Fixed in 8.2510.0-2.el9_8.2
- rsyslog-omamqp1 Fixed in 8.2510.0-2.el9_8.2
- rsyslog-openssl Fixed in 8.2510.0-2.el9_8.2
- rsyslog-pgsql Fixed in 8.2510.0-2.el9_8.2
- rsyslog-relp Fixed in 8.2510.0-2.el9_8.2
- rsyslog-snmp Fixed in 8.2510.0-2.el9_8.2
- rsyslog-udpspoof Fixed in 8.2510.0-2.el9_8.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- rsyslog Fixed in 8.2510.0-5.el10_2.2
- rsyslog-crypto Fixed in 8.2510.0-5.el10_2.2
- rsyslog-doc Fixed in 8.2510.0-5.el10_2.2
- rsyslog-elasticsearch Fixed in 8.2510.0-5.el10_2.2
- rsyslog-gnutls Fixed in 8.2510.0-5.el10_2.2
- rsyslog-gssapi Fixed in 8.2510.0-5.el10_2.2
- rsyslog-kafka Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmaudit Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmfields Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmjsonparse Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmkubernetes Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmnormalize Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmsnmptrapd Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mysql Fixed in 8.2510.0-5.el10_2.2
- rsyslog-omamqp1 Fixed in 8.2510.0-5.el10_2.2
- rsyslog-openssl Fixed in 8.2510.0-5.el10_2.2
- rsyslog-pgsql Fixed in 8.2510.0-5.el10_2.2
- rsyslog-relp Fixed in 8.2510.0-5.el10_2.2
- rsyslog-snmp Fixed in 8.2510.0-5.el10_2.2
- rsyslog-udpspoof Fixed in 8.2510.0-5.el10_2.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- rsyslog Fixed in 8.2102.0-15.el8_10.3
- rsyslog-crypto Fixed in 8.2102.0-15.el8_10.3
- rsyslog-doc Fixed in 8.2102.0-15.el8_10.3
- rsyslog-elasticsearch Fixed in 8.2102.0-15.el8_10.3
- rsyslog-gnutls Fixed in 8.2102.0-15.el8_10.3
- rsyslog-gssapi Fixed in 8.2102.0-15.el8_10.3
- rsyslog-kafka Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmaudit Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmfields Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmjsonparse Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmkubernetes Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmnormalize Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mmsnmptrapd Fixed in 8.2102.0-15.el8_10.3
- rsyslog-mysql Fixed in 8.2102.0-15.el8_10.3
- rsyslog-omamqp1 Fixed in 8.2102.0-15.el8_10.3
- rsyslog-openssl Fixed in 8.2102.0-15.el8_10.3
- rsyslog-pgsql Fixed in 8.2102.0-15.el8_10.3
- rsyslog-relp Fixed in 8.2102.0-15.el8_10.3
- rsyslog-snmp Fixed in 8.2102.0-15.el8_10.3
- rsyslog-udpspoof Fixed in 8.2102.0-15.el8_10.3
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- rsyslog Fixed in 8.2510.0-2.el9_8.2
- rsyslog-crypto Fixed in 8.2510.0-2.el9_8.2
- rsyslog-doc Fixed in 8.2510.0-2.el9_8.2
- rsyslog-elasticsearch Fixed in 8.2510.0-2.el9_8.2
- rsyslog-gnutls Fixed in 8.2510.0-2.el9_8.2
- rsyslog-gssapi Fixed in 8.2510.0-2.el9_8.2
- rsyslog-kafka Fixed in 8.2510.0-2.el9_8.2
- rsyslog-logrotate Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmaudit Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmfields Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmjsonparse Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmkubernetes Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmnormalize Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mmsnmptrapd Fixed in 8.2510.0-2.el9_8.2
- rsyslog-mysql Fixed in 8.2510.0-2.el9_8.2
- rsyslog-omamqp1 Fixed in 8.2510.0-2.el9_8.2
- rsyslog-openssl Fixed in 8.2510.0-2.el9_8.2
- rsyslog-pgsql Fixed in 8.2510.0-2.el9_8.2
- rsyslog-relp Fixed in 8.2510.0-2.el9_8.2
- rsyslog-snmp Fixed in 8.2510.0-2.el9_8.2
- rsyslog-udpspoof Fixed in 8.2510.0-2.el9_8.2
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- rsyslog Fixed in 8.2510.0-5.el10_2.2
- rsyslog-crypto Fixed in 8.2510.0-5.el10_2.2
- rsyslog-doc Fixed in 8.2510.0-5.el10_2.2
- rsyslog-elasticsearch Fixed in 8.2510.0-5.el10_2.2
- rsyslog-gnutls Fixed in 8.2510.0-5.el10_2.2
- rsyslog-gssapi Fixed in 8.2510.0-5.el10_2.2
- rsyslog-kafka Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmaudit Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmfields Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmjsonparse Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmkubernetes Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmnormalize Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mmsnmptrapd Fixed in 8.2510.0-5.el10_2.2
- rsyslog-mysql Fixed in 8.2510.0-5.el10_2.2
- rsyslog-omamqp1 Fixed in 8.2510.0-5.el10_2.2
- rsyslog-openssl Fixed in 8.2510.0-5.el10_2.2
- rsyslog-pgsql Fixed in 8.2510.0-5.el10_2.2
- rsyslog-relp Fixed in 8.2510.0-5.el10_2.2
- rsyslog-snmp Fixed in 8.2510.0-5.el10_2.2
- rsyslog-udpspoof Fixed in 8.2510.0-5.el10_2.2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- rsyslog No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- rsyslog Fixed in 8.2504.0-1+deb13u2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- rsyslog Fixed in 8.2608.0-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- rsyslog Fixed in 8.2112.0-2ubuntu2.5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- rsyslog Fixed in 8.2312.0-3ubuntu9.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- rsyslog Fixed in 8.2512.0-1ubuntu4.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- rsyslog Fixed in 8.16.0-1ubuntu3.1+esm3Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- rsyslog Fixed in 8.32.0-1ubuntu4.2+esm1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- rsyslog Fixed in 8.2001.0-1ubuntu1.3+esm1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.