Skip to content
Noroxi
NVD / CVE Program· CNA mitre

CVE-2018-18311: Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CriticalCVSS 9.8 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Plan (action score 43/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 11.6% (FIRST EPSS); higher than 96.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: perl (Alpine:v3.10) 5.26.3-r0; perl (Alpine:v3.6) 5.24.4-r2; perl (Debian:12) 5.28.1-1.

Add it to your regular patch cycle. Upgrade to perl (Alpine:v3.10) 5.26.3-r0; perl (Alpine:v3.6) 5.24.4-r2; perl (Debian:12) 5.28.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Published
Dec 7, 2018
Updated
Jun 16, 2026
EPSS
11.6% · 96th percentile

Report tools

JSON

Action score

43

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
4 / 30 · 11.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2018-18311

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for perl records
Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
perlperl
canonicalubuntu linux
debiandebian linux
netappe-series santricity os controller
netappsnap creator framework
netappsnapcenter
netappsnapdriver
redhatopenshift container platform
redhatenterprise linux
redhatenterprise linux desktop
redhatenterprise linux eus
redhatenterprise linux server

and 6 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple mac os xbefore 10.14.4
  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • debian debian linux8.0
  • debian debian linux9.0
+12 more rows
  • fedoraproject fedora29
  • mcafee web gateway7.7.2 and later · before 7.7.2.21
  • mcafee web gateway8.0.0 and later · before 8.1.1
  • mcafee web gateway7.8.2 and later · before 7.8.2.8
  • netapp e-series santricity os controllerall versions
  • netapp snap creator frameworkall versions
  • netapp snapcenterall versions
  • netapp snapdriverall versions
  • perl perlbefore 5.26.3
  • perl perl5.28.0 and later · before 5.28.1
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10perlfrom 5.28.0 · before 5.26.3-r05.26.3-r0
Alpine:v3.6perlfrom 5.28.0 · before 5.24.4-r25.24.4-r2
Debian:12perlbefore 5.28.1-15.28.1-1
Debian:8perlbefore 5.20.2-3+deb8u125.20.2-3+deb8u12
Debian:9perlbefore 5.24.1-3+deb9u55.24.1-3+deb9u5
openSUSE:Tumbleweedperlbefore 5.34.0-1.15.34.0-1.1
Red Hat:enterprise_linux:7::clientperlbefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-corebefore 0:5.16.3-294.el7_60:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-CPANbefore 0:1.9800-294.el7_60:1.9800-294.el7_6
Red Hat:enterprise_linux:7::clientperl-debuginfobefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-develbefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-ExtUtils-CBuilderbefore 1:0.28.2.6-294.el7_61:0.28.2.6-294.el7_6
Red Hat:enterprise_linux:7::clientperl-ExtUtils-Embedbefore 0:1.30-294.el7_60:1.30-294.el7_6
Red Hat:enterprise_linux:7::clientperl-ExtUtils-Installbefore 0:1.58-294.el7_60:1.58-294.el7_6
Red Hat:enterprise_linux:7::clientperl-IO-Zlibbefore 1:1.10-294.el7_61:1.10-294.el7_6
Red Hat:enterprise_linux:7::clientperl-libsbefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Locale-Maketext-Simplebefore 1:0.21-294.el7_61:0.21-294.el7_6
Red Hat:enterprise_linux:7::clientperl-macrosbefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Module-CoreListbefore 1:2.76.02-294.el7_61:2.76.02-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Module-Loadedbefore 1:0.08-294.el7_61:0.08-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Object-Accessorbefore 1:0.42-294.el7_61:0.42-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Package-Constantsbefore 1:0.02-294.el7_61:0.02-294.el7_6
Red Hat:enterprise_linux:7::clientperl-Pod-Escapesbefore 1:1.04-294.el7_61:1.04-294.el7_6
Red Hat:enterprise_linux:7::clientperl-testsbefore 4:5.16.3-294.el7_64:5.16.3-294.el7_6

+96

Same product

perl: all records

Other highest-scoring records for the same primary product.

  • CVE-2012-6329The _compile function in Maketext.pm in the Locale::Maketext implementation in Perl before 5.17.7 does not properly handle backslashes and…
    49Plan
  • CVE-2018-18312Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.
    43Plan
  • CVE-2018-6913Heap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2018-6798Apr 17, 2018 · An issue was discovered in Perl 5.22 through 5.26.
    31Monitor
  • ← EarlierCVE-2018-12015Jun 7, 2018 · In Perl through 5.26.2, the Archive::Tar module allows remote attackers to bypass a directory-traversal protection mechanism, and overwrite…
    32Monitor
  • Later →CVE-2018-18313Dec 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…
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:perl5.26.3-r0 · Alpine:v3.10Package registry (OSV)
debian:perl5.28.1-1 · Debian:12Package registry (OSV)
opensuse:perl5.34.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:rh-perl526-perl4:5.26.3-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Attribute-Handlers0:0.99-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Devel-Peek0:1.26-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Devel-SelfStubber0:1.06-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Errno0:1.28-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-ExtUtils-Embed0:1.34-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-ExtUtils-Miniperl0:1.06-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-IO0:1.38-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-IO-Zlib1:1.10-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Locale-Maketext-Simple1:0.21-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Math-Complex0:1.59-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:rh-perl526-perl-Memoize0:1.03-405.el7 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
suse:perl5.26.1-7.6.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records