CVE-2018-6797

Publication date 14 April 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes written.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
perl	17.10 artful	Fixed 5.26.0-8ubuntu1.1
	16.04 LTS xenial	Fixed 5.22.1-9ubuntu0.3
	14.04 LTS trusty	Ignored

Notes

ratliff

Fix developed by Yves Orton and Karl Williamson

mdeslaur

code is different in trusty, backport difficult and prone to introducing regressions. Marking as ignored.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
perl	Upstream: https://perl5.git.perl.org/perl.git/commitdiff/510cc261d965ccfa427900ebb368fc4d337442d2 Upstream: https://perl5.git.perl.org/perl.git/commitdiff/abe1e6c568b96bcb382dfa4f61c56d1ab001ea51

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-3625-1
Perl vulnerabilities
16 April 2018

Other references

https://www.cve.org/CVERecord?id=CVE-2018-6797