CVE-2026-43958 Rrdtool: rrdtool: stack buffer overflow allows local code execution or denial of service
A local attacker can exploit a stack buffer overflow in rrdcached to execute arbitrary code or crash the service, affecting Linux systems using rrdtool.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43958?
CVE-2026-43958 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-43958?
Linux distribution packages (40)
python3-rrdtool AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-devel AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-doc AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-lua AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-perl AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-ruby AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
rrdtool-tcl AlmaLinux:10 | All versions | 1.8.0-21.el10_2 |
python3-rrdtool AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-devel AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-doc AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-lua AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-perl AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-ruby AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
rrdtool-tcl AlmaLinux:8 | All versions | 1.7.0-17.el8_10 |
python3-rrdtool AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-devel AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-doc AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-lua AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-perl AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-ruby AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
rrdtool-tcl AlmaLinux:9 | All versions | 1.7.2-22.el9_8 |
python3-rrdtool Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
python3-rrdtool-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-debugsource Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-devel Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-doc Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-lua Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-lua-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-perl Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-perl-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-ruby Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-ruby-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-tcl Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
rrdtool-tcl-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.0-21.el10_2 |
python3-rrdtool-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-17.el8_10 |
How do I fix CVE-2026-43958?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-43958 being exploited?
There is no known exploitation of CVE-2026-43958 in the wild and no public exploit code.
Sources
Also known as ALSA-2026:33731, ALSA-2026:34155, ALSA-2026:34156, AZL-89478, CLSA-2026-1783688499, CLSA-2026-1783688821 and 24 more.