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Fencer Vulns
high 7.8

CVE-2026-43958 json

Rrdtool: rrdtool: stack buffer overflow allows local code execution or denial of service

published 2026-06-01 5 mo ago modified 2026-11-05 3 d ago also EUVD-2026-33726

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:1.8.0-21.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.8.0-20.el10_0.1
  • Red Hat Red Hat Enterprise Linux 8 0:1.7.0-17.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:1.7.2-22.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.7.2-21.el9_2.1
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.7.2-21.el9_4.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.7.2-21.el9_6.1
  • rrdtool RHEL 9 1.7.2-22.el9_8
  • rrdtool-lua RHEL 9 1.7.2-22.el9_8
  • rrdtool-tcl RHEL 9 1.7.2-22.el9_8
  • rrdtool-perl RHEL 9 1.7.2-22.el9_8
  • rrdtool-ruby RHEL 9 1.7.2-22.el9_8
  • python3-rrdtool RHEL 9 1.7.2-22.el9_8
  • rrdtool RHEL 8 1.7.0-17.el8_10
  • rrdtool-lua RHEL 8 1.7.0-17.el8_10

red hat advisories RHSA-2026:72277RHSA-2026:72278RHSA-2026:71600RHSA-2026:68702RHSA-2026:34156RHSA-2026:34155

  • rrdtool SLES 16.0, SLES for SAP applications 16.0 1.9.0-160000.4.1
  • rrdtool SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 1.8.0-150600.3.9.1
  • rrdtool SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.7.0-150000.6.6.1

suse advisories SUSE-SU-2026:23119-1SUSE-SU-2026:23141-1SUSE-SU-2026:3468-1SUSE-SU-2026:3449-1

  • rrdtool openSUSE Leap 16.0 1.9.0-160000.4.1
  • rrdtool openSUSE Tumbleweed 1.10.3-1.1

opensuse advisories openSUSE-SU-2026:21525-1openSUSE-SU-2026:11430-1

  • rrdtool AlmaLinux 8 1.7.0-17.el8_10
  • rrdtool-lua AlmaLinux 8 1.7.0-17.el8_10
  • rrdtool-tcl AlmaLinux 8 1.7.0-17.el8_10
  • rrdtool-perl AlmaLinux 8 1.7.0-17.el8_10
  • rrdtool-ruby AlmaLinux 8 1.7.0-17.el8_10
  • python3-rrdtool AlmaLinux 8 1.7.0-17.el8_10
  • rrdtool AlmaLinux 9 1.7.2-22.el9_8
  • rrdtool-lua AlmaLinux 9 1.7.2-22.el9_8

almalinux advisories ALSA-2026:34155ALSA-2026:34156ALSA-2026:33731

  • rrdtool Rocky Linux 10 1.8.0-21.el10_2
  • rrdtool Rocky Linux 9 1.7.2-22.el9_8
  • rrdtool Rocky Linux 8 1.7.0-17.el8_10

rocky linux advisories RLSA-2026:33731RLSA-2026:34156RLSA-2026:34155

  • rrdtool Azure Linux 3.0 1.8.0-3

azure linux advisories AZL-89478

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43958 updated cvss 7.8

rrdtool: rrdtool: Stack buffer overflow allows local code execution or denial of service

  • Red Hat Enterprise Linux 6 rrdtool, rrdtool-php, rrdtool-tcl, rrdtool-perl, rrdtool-ruby, rrdtool-python
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 rrdtool, rrdtool-lua, rrdtool-php, rrdtool-tcl, rrdtool-perl, rrdtool-ruby, +1 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) rrdtool 1.7.0-17.el8_10, rrdtool-perl 1.7.0-17.el8_10
    fixed: vendor fix RHSA-2026:34155
  • Red Hat Enterprise Linux AppStream (v. 9) rrdtool 1.7.2-22.el9_8, rrdtool-perl 1.7.2-22.el9_8
    fixed: vendor fix RHSA-2026:34156
  • Red Hat Enterprise Linux AppStream (v. 10) rrdtool 1.8.0-21.el10_2, rrdtool-perl 1.8.0-21.el10_2
    fixed: vendor fix RHSA-2026:33731
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) rrdtool 1.7.2-21.el9_2.1
    fixed: vendor fix RHSA-2026:72277
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rrdtool 1.7.2-21.el9_4.1
    fixed: vendor fix RHSA-2026:72278
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rrdtool 1.8.0-20.el10_0.1
    fixed: vendor fix RHSA-2026:68702
show 5 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rrdtool 1.7.2-21.el9_6.1
    fixed: vendor fix RHSA-2026:71600
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) rrdtool-lua 1.7.2-22.el9_8, rrdtool-tcl 1.7.2-22.el9_8, rrdtool-ruby 1.7.2-22.el9_8, python3-rrdtool 1.7.2-22.el9_8
    fixed: vendor fix RHSA-2026:34156
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) rrdtool-lua 1.8.0-21.el10_2, rrdtool-tcl 1.8.0-21.el10_2, rrdtool-ruby 1.8.0-21.el10_2, python3-rrdtool 1.8.0-21.el10_2
    fixed: vendor fix RHSA-2026:33731
  • Red Hat Enterprise Linux CRB (v. 8) rrdtool-lua 1.7.0-17.el8_10, rrdtool-tcl 1.7.0-17.el8_10, rrdtool-ruby 1.7.0-17.el8_10, python3-rrdtool 1.7.0-17.el8_10
    fixed: vendor fix RHSA-2026:34155
  • Red Hat CodeReady Linux Builder EUS (v.9.6) rrdtool-lua 1.7.2-21.el9_6.1, rrdtool-tcl 1.7.2-21.el9_6.1, rrdtool-ruby 1.7.2-21.el9_6.1, python3-rrdtool 1.7.2-21.el9_6.1 Red Hat Enterprise Linux AppStream E4S (v.9.2) rrdtool-perl 1.7.2-21.el9_2.1 Red Hat Enterprise Linux AppStream E4S (v.9.4) rrdtool-perl 1.7.2-21.el9_4.1 Red Hat Enterprise Linux AppStream EUS (v. 10.0) rrdtool-perl 1.8.0-20.el10_0.1 Red Hat Enterprise Linux AppStream EUS (v.9.6) rrdtool-perl 1.7.2-21.el9_6.1 Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) rrdtool-lua 1.8.0-20.el10_0.1, rrdtool-tcl 1.8.0-20.el10_0.1, rrdtool-ruby 1.8.0-20.el10_0.1, python3-rrdtool 1.8.0-20.el10_0.1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.