CVE-2023-36328

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-09-01. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Integer Overflow vulnerability in mp_grow in libtom libtommath before commit beba892bc0d4e4ded4d667ab1d2a94f4d75109a9, allows attackers to execute arbitrary code and cause a denial of service (DoS).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
66%
KEV
Not listed

Published

September 1, 2023

Last Modified

June 26, 2025

Advisory Details (5)

Auto-updated Jul 4, 2026
Patch available. Sources: github_pr.
generic

[SECURITY] Fedora 39 Update: libtommath-1.2.0-13.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6ZUPWZGPFJ4JOI2NIP7YLRKZD5YXQTBK/
generic

[SECURITY] Fedora 37 Update: libtommath-1.2.0-11.fc37 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46GORAXZ34MHQNUGJBKS7PJ5NSMIAJGC/
generic

[SECURITY] Fedora 38 Update: libtommath-1.2.0-12.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3H2PFUTBKQUDSOJXQQS7LUSZQWT3JTW2/
generic Patch Available

[SECURITY] [DLA 3857-1] libtommath security update

https://lists.debian.org/debian-lts-announce/2024/09/msg00011.html
github_pr Patch Available

Fix possible integer overflow

Patch available: libtom/libtommath v1.2.1 (PR #546 merged 2023-06-01)

https://github.com/libtom/libtommath/pull/546

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibtommath1 (1.2.0-6ubuntu0.23.10.1) @ mantic2026-05-24ubuntu
ubuntulibtommath0 (0.42.0-1.2ubuntu0.1~esm1) @ xenial2026-05-24ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 118 total refreshes for this CVE.

  1. 2026-07-27 14:10 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-36328?
CVE-2023-36328 is a critical vulnerability published on September 1, 2023. Integer Overflow vulnerability in mp_grow in libtom libtommath before commit beba892bc0d4e4ded4d667ab1d2a94f4d75109a9, allows attackers to execute arbitrary code and cause a denial of service (DoS).
When was CVE-2023-36328 disclosed?
CVE-2023-36328 was first published in the National Vulnerability Database on September 1, 2023, with the most recent update on June 26, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-36328 actively exploited?
CVE-2023-36328 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 33.6% of all scored CVEs.
What is the CVSS score of CVE-2023-36328?
CVE-2023-36328 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-36328?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-36328, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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