CVE-2018-18314

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
92.6%
KEV
Not listed

Published

December 7, 2018

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Jun 8, 2026
Patch available. Sources: redhat, github_commit.
generic

Perl: Multiple vulnerabilities (GLSA 201909-01) — Gentoo security

https://security.gentoo.org/glsa/201909-01
generic

[CVE-2018-18314] Heap-based buffer overflow in S_regatom · Issue #16041 · Perl/perl5 · GitHub

https://rt.perl.org/Ticket/Display.html?id=131649
generic

Client Challenge

https://metacpan.org/changes/release/SHAY/perl-5.26.3
generic

[SECURITY] Fedora 29 Update: perl-5.28.1-425.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWQGEB543QN7SSBRKYJM6PSOC3RLYGSM/
github_commit

commit 19a498a461d7 (Perl/perl5)

Fix landed in Perl/perl5 commit 19a498a461d7 — awaiting tagged release

https://github.com/Perl/perl5/commit/19a498a461d7c81ae3507c450953d1148efecf4f
redhat Patch Available

1646751 – (CVE-2018-18314) CVE-2018-18314 perl: Heap-based buffer overflow in S_regatom()

Affected: Red Hat Enterprise Linux 7

https://bugzilla.redhat.com/show_bug.cgi?id=1646751
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:0010
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:0001
generic
http://www.securitytracker.com/id/1042181
generic
http://www.securityfocus.com/bid/106145

Vendor Advisories for CVE-2018-18314(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuperl-modules-5.22 (5.22.1-9ubuntu0.6) @ xenial2026-05-28ubuntu
redhatperl-main-1.03-524.1.hum12026-04-10redhat
redhatrh-perl526-perl-Module-CoreList-1:5.20181130-1.el72019-01-02redhat
redhatrh-perl524-perl-4:5.24.0-381.el72019-01-02redhat

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.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 50× 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 104 total refreshes for this CVE.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:34 UTCEG score recompute
  3. 2026-07-22 22:14 UTCEG score recompute
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  71. 2026-05-28 00:30 UTCVendor advisory
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Frequently asked(5)

What is CVE-2018-18314?
CVE-2018-18314 is a critical vulnerability published on December 7, 2018. Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.
When was CVE-2018-18314 disclosed?
CVE-2018-18314 was first published in the National Vulnerability Database on December 7, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-18314 actively exploited?
CVE-2018-18314 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-18314?
CVE-2018-18314 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-18314?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-18314, 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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