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CVE Record

CVE-2018-6798: An issue was discovered in Perl 5.22 through 5.26.

An issue was discovered in Perl 5.22 through 5.26. Matching a crafted locale dependent regular expression can cause a heap-based buffer over-read and potentially information disclosure.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Perl 5.22 through 5.26 can read past a heap buffer when processing a crafted locale-dependent regular expression. In business terms, affected systems may disclose memory contents if an application lets attacker-controlled input reach this regex behavior.

Executive priority

Treat as a scheduled remediation item unless a critical service exposes untrusted regex processing. The main business risk is information disclosure from older Perl runtimes, not confirmed widespread exploitation.

Technical view

CVE-2018-6798 is a heap-based buffer over-read in Perl regular-expression handling for crafted locale-dependent matching. The provided record names Perl 5.22 through 5.26 and potential information disclosure, with no CVSS, CWE, CPE, or KEV exploitation evidence included.

Likely exposure

Exposure is most likely on servers, scripts, or applications running Perl 5.22-5.26 where untrusted input can affect locale-dependent regex matching. Distribution-packaged Perl should be checked against Red Hat, Ubuntu, Debian, Gentoo, and Oracle advisories.

Exploitation context

The bundle does not show active exploitation and KEV is false. The practical attack path depends on application-specific input flow into vulnerable regex matching, so exposure cannot be assumed from Perl presence alone.

Researcher notes

The public bundle is thin: no CVSS, CWE, CPEs, or exploit telemetry are provided. Validation should focus on exact Perl versions, distro backports, and whether application data flow can trigger locale-dependent regex matching.

Mitigation direction

  • Apply the relevant vendor Perl security update for each affected operating system distribution.
  • Prioritize internet-facing or multi-tenant services that process untrusted text with Perl.
  • If no package fix is clear, check current vendor guidance before changing runtime behavior.
  • Retire unsupported Perl 5.22-5.26 deployments where vendor fixes are unavailable.

Validation and detection

  • Inventory Perl versions across hosts, containers, CI images, and application runtimes.
  • Map Perl packages to the referenced vendor advisories for fixed status.
  • Review applications for untrusted input reaching locale-dependent regular-expression processing.
  • Confirm patched package versions in vulnerability scanners or package manager records.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2018-6798 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.