What’s Vulnerable › Vulnerabilities

CVE-2026-43958: Rrdtool: rrdtool: stack buffer overflow allows local code execution or denial of service

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-09-28
• Weakness: CWE-121

Description

A flaw was found in rrdcached, a component of rrdtool. A local attacker with access to a rrdcached socket can exploit a stack-based buffer overflow by sending an oversized CREATE request. This vulnerability can lead to a denial of service by crashing the daemon or potentially allow for arbitrary code execution, impacting the integrity and confidentiality of data.

Affected products

• Red Hat Enterprise Linux 10: all versions — fixed in 0:1.8.0-21.el10_2
• Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:1.8.0-20.el10_0.1
• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions — fixed in 0:1.7.0-17.el8_10
• Red Hat Enterprise Linux 9: all versions — fixed in 0:1.7.2-22.el9_8
• Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:1.7.2-21.el9_2.1
• Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:1.7.2-21.el9_4.1
• Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:1.7.2-21.el9_6.1

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:1.8.0-21.el10_2; Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.8.0-20.el10_0.1; Red Hat Enterprise Linux 8 0:1.7.0-17.el8_10; Red Hat Enterprise Linux 9 0:1.7.2-22.el9_8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.7.2-21.el9_2.1; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.7.2-21.el9_4.1; Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.7.2-21.el9_6.1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:33731
• https://access.redhat.com/errata/RHSA-2026:34155
• https://access.redhat.com/errata/RHSA-2026:34156
• https://access.redhat.com/errata/RHSA-2026:68702
• https://access.redhat.com/errata/RHSA-2026:71600
• https://access.redhat.com/errata/RHSA-2026:72277
• https://access.redhat.com/errata/RHSA-2026:72278
• https://access.redhat.com/security/cve/CVE-2026-43958
• https://bugzilla.redhat.com/show_bug.cgi?id=2460932

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