CVE-2018-18313

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 10%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Perl before 5.26.3 has a buffer over-read via a crafted regular expression that triggers disclosure of sensitive information from process memory.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity91% × 45%
Exploitation10% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
94.9%
KEV
Not listed

Published

December 7, 2018

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Jul 21, 2026
Patch available. Sources: redhat, github_commit.
generic

Bugtraq: APPLE-SA-2019-3-25-2 macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra

https://seclists.org/bugtraq/2019/Mar/42
generic

[CVE-2018-18313] regcomp: heap-buffer-overflow read in S_grok_bslash_N (perl-5.26.2) · Issue #16554 · Perl/perl5 · GitHub

https://rt.perl.org/Ticket/Display.html?id=133192
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 43b2f4ef399e (Perl/perl5)

Fix landed in Perl/perl5 commit 43b2f4ef399e — awaiting tagged release

https://github.com/Perl/perl5/commit/43b2f4ef399e2fd7240b4eeb0658686ad95f8e62
redhat Patch Available

1646738 – (CVE-2018-18313) CVE-2018-18313 perl: Heap-based buffer read overflow in S_grok_bslash_N()

Affected: Red Hat Enterprise Linux 7

https://bugzilla.redhat.com/show_bug.cgi?id=1646738
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

Full Disclosure: APPLE-SA-2019-3-25-2 macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra

http://seclists.org/fulldisclosure/2019/Mar/49

Vendor Advisories for CVE-2018-18313(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuperl-modules-5.26 (5.26.1-6ubuntu0.3) @ bionic2026-05-28ubuntu
ubuntuperl (5.14.2-6ubuntu2.9) @ precise2026-05-28ubuntu
redhatperl-main-1.03-524.1.hum12026-04-10redhat
redhatrh-perl524-perl-4:5.24.0-381.el72019-01-02redhat
redhatrh-perl526-perl-Module-CoreList-1:5.20181130-1.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

(4)

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 / 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.

  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
  4. 2026-07-22 14:05 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-21 01:47 UTCOSV refresh
  7. 2026-07-20 17:04 UTCEPSS rescore
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  9. 2026-07-19 14:28 UTCEPSS rescore
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  16. 2026-07-15 01:56 UTCEPSS rescore
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  18. 2026-07-13 22:27 UTCEPSS rescore
  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-12 05:43 UTCEPSS rescore
  21. 2026-07-11 08:24 UTCEPSS rescore
  22. 2026-07-09 19:06 UTCEPSS rescore
  23. 2026-07-08 15:11 UTCEPSS rescore
  24. 2026-07-07 13:42 UTCEPSS rescore
  25. 2026-07-07 13:42 UTCEPSS rescore
Show 74 more
  1. 2026-07-06 02:20 UTCEPSS rescore
  2. 2026-07-05 02:27 UTCEPSS rescore
  3. 2026-07-04 06:28 UTCEPSS rescore
  4. 2026-07-04 06:28 UTCEPSS rescore
  5. 2026-07-03 20:56 UTCOSV refresh
  6. 2026-07-02 16:54 UTCEPSS rescore
  7. 2026-07-01 15:03 UTCEPSS rescore
  8. 2026-07-01 15:03 UTCEPSS rescore
  9. 2026-06-30 23:20 UTCEPSS rescore
  10. 2026-06-30 23:19 UTCEPSS rescore
  11. 2026-06-29 14:03 UTCEPSS rescore
  12. 2026-06-28 14:04 UTCEPSS rescore
  13. 2026-06-28 04:53 UTCEPSS rescore
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  15. 2026-06-27 03:06 UTCEPSS rescore
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  17. 2026-06-25 13:47 UTCEPSS rescore
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  19. 2026-06-24 14:02 UTCEPSS rescore
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  21. 2026-06-23 21:30 UTCEPSS rescore
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  24. 2026-06-22 14:23 UTCEPSS rescore
  25. 2026-06-21 01:57 UTCEPSS rescore
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  27. 2026-06-19 19:23 UTCEPSS rescore
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  29. 2026-06-18 17:50 UTCEPSS rescore
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  31. 2026-06-17 17:50 UTCEPSS rescore
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  34. 2026-06-16 17:50 UTCEPSS rescore
  35. 2026-06-15 17:45 UTCEPSS rescore
  36. 2026-06-15 09:13 UTCOSV refresh
  37. 2026-06-14 23:15 UTCEPSS rescore
  38. 2026-06-14 23:14 UTCEPSS rescore
  39. 2026-06-13 22:58 UTCEPSS rescore
  40. 2026-06-12 23:09 UTCEPSS rescore
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  42. 2026-06-11 13:57 UTCEPSS rescore
  43. 2026-06-10 22:16 UTCEPSS rescore
  44. 2026-06-10 13:19 UTCEPSS rescore
  45. 2026-06-08 14:14 UTCEPSS rescore
  46. 2026-06-08 14:14 UTCEPSS rescore
  47. 2026-06-07 15:22 UTCEPSS rescore
  48. 2026-06-07 15:22 UTCEPSS rescore
  49. 2026-06-06 13:45 UTCEPSS rescore
  50. 2026-06-06 13:45 UTCEPSS rescore
  51. 2026-06-05 22:45 UTCEPSS rescore
  52. 2026-06-05 22:45 UTCEPSS rescore
  53. 2026-06-05 06:08 UTCEPSS rescore
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  55. 2026-06-04 13:10 UTCEPSS rescore
  56. 2026-06-02 20:11 UTCEPSS rescore
  57. 2026-06-02 20:11 UTCEPSS rescore
  58. 2026-06-01 13:50 UTCEPSS rescore
  59. 2026-06-01 13:50 UTCEPSS rescore
  60. 2026-05-31 22:29 UTCEPSS rescore
  61. 2026-05-31 00:14 UTCEPSS rescore
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  63. 2026-05-29 13:41 UTCEPSS rescore
  64. 2026-05-28 13:42 UTCEPSS rescore
  65. 2026-05-28 13:42 UTCEPSS rescore
  66. 2026-05-28 00:30 UTCEG score recompute
  67. 2026-05-28 00:30 UTCVendor advisory
  68. 2026-05-28 00:29 UTCGHSA enrichment
  69. 2026-05-27 13:38 UTCEPSS rescore
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  71. 2026-05-26 13:42 UTCEPSS rescore
  72. 2026-05-26 13:42 UTCEPSS rescore
  73. 2026-05-26 07:17 UTCEPSS rescore
  74. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-18313?
CVE-2018-18313 is a critical vulnerability published on December 7, 2018. Perl before 5.26.3 has a buffer over-read via a crafted regular expression that triggers disclosure of sensitive information from process memory.
When was CVE-2018-18313 disclosed?
CVE-2018-18313 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-2018-18313 actively exploited?
CVE-2018-18313 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-18313?
CVE-2018-18313 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2018-18313?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-18313, 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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