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  4. CVE 2026 43958 rrdtool rrdtool stack buffer overflow allows
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Back to active CVEs
High · CVSS 7.8CVE-2026-43958

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

Answer in brief

CVE-2026-43958 records a High severity (CVSS 7.8) vulnerability in Rrdtool: rrdtool: stack buffer overflow allows local code execution or denial of service. The current sources do not mark it as known exploited. The current feed maps Red Hat/rrdtool (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 1, 2026Updated Sep 28, 2026Source checked Nov 4, 2026First seen by HOL Jul 1, 2026Material review Sep 28, 2026
Upstream Advisory

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Nov 4, 2026
References
9 linked sources
Open source record

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/rrdtool (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/rrdtoolgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/rrdtool.
  2. 2Review the reported fix. Source-reported workaround: Restrict access to the `rrdcached` UNIX socket using filesystem permissions and group ownership to prevent untrusted local users from connecting. Avoid exposing `rrdcached` on TCP listeners unless strictly necessary, and ensure any such listeners are protected by network access controls. Additionally, run the `rrdcached` daemon as an unprivileged user and group using the `-U` and `-G` options to minimize impact in case of compromise. If `rrdcached` is restarted or reloaded, these configurations will be reapplied.

Evidence timeline and material changes

  1. Published upstream

    Jun 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 1, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.