CVE-2026-78002

MEDIUM

7.5

CVSS v3

Description

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.

CWE-131

How to fix

Remediation Available

rsyslogDebian

Fixed in:8.2504.0-1+deb13u2CVE-2026-78002

Fixed in:8.2608.0-4CVE-2026-78002

rsyslogRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslogRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-cryptoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-cryptoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-crypto-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-crypto-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-debugsourceRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-debugsourceRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-docRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-docRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-elasticsearchRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-elasticsearchRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-elasticsearch-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-elasticsearch-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gnutlsRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gnutlsRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gnutls-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gnutls-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gssapiRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gssapiRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gssapi-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-gssapi-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-kafkaRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-kafkaRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-kafka-debuginfoRocky

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-kafka-debuginfoRed Hat / RHEL

Fixed in:0:8.2510.0-5.el10_2.2RHSA-2026:69541

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

rsyslog-logrotateRed Hat / RHEL

Fixed in:0:8.2510.0-2.el9_8.2RHSA-2026:69540

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.71%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Other references7

Related Vulnerabilities

Other CWE-131 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-36824	High	7.4	77%	-	Fix
CVE-2020-8450	High	7.3	72%	-	Fix
CVE-2020-6113	High	7.8	64%	-	-
CVE-2020-6116	High	7.8	28%	-	-
CVE-2005-3120	Critical	9.8	23%	-	Fix
CVE-2022-43945	High	7.5	22%	-	Fix

Common questions

How do I fix CVE-2026-78002?

Published advisories record a fix for 84 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-78002 being actively exploited?

Not that we know of. CVE-2026-78002 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.71% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

How severe is CVE-2026-78002?

CVE-2026-78002 has a CVSS v3 base score of 7.5, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-78002 affect?

Published advisories record a fix for rsyslog (Debian), rsyslog (Rocky), rsyslog (Red Hat / RHEL), rsyslog-crypto (Red Hat / RHEL), and 80 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-78002

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-25.