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CVE-2018-18311

37
FAUCET Score

CVE-2018-18311 is a critical buffer overflow vulnerability affecting Perl versions before 5.26.3 and 5.28.x before 5.28.1, impacting various products from vendors like Apple, Canonical, Debian, and Red Hat. This flaw allows for invalid write operations through a specially crafted regular expression. With a CVSS score of 9.8, it poses a severe risk, enabling unauthenticated attackers to achieve high confidentiality, integrity, and availability impacts over the network with low attack complexity. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.26.3CPE matchmatch criteria
cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*
>= 5.28.0, < 5.28.1CPE matchmatch criteria
cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
11.68%
Probability of exploitation in next 30 days
EPSS Percentile
95.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.1168 is in the 91st percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (25)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: perl-4:5.16.3-294.el7_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.3 Advanced Update SupportFixed in: perl-4:5.16.3-291.el7_3.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.3 Telco Extended Update SupportFixed in: perl-4:5.16.3-291.el7_3.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsFixed in: perl-4:5.16.3-291.el7_3.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.4 Extended Update SupportFixed in: perl-4:5.16.3-292.el7_4.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.5 Extended Update SupportFixed in: perl-4:5.16.3-292.el7_5.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-perl524-perl-4:5.24.0-381.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-perl526-perl-4:5.26.3-405.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-perl526-perl-Module-CoreList-1:5.20181130-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-perl524-perl-4:5.24.0-381.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-perl526-perl-4:5.26.3-405.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-perl526-perl-Module-CoreList-1:5.20181130-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-perl524-perl-4:5.24.0-381.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSFixed in: rh-perl526-perl-4:5.26.3-405.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSFixed in: rh-perl526-perl-Module-CoreList-1:5.20181130-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSFixed in: rh-perl524-perl-4:5.24.0-381.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSFixed in: rh-perl526-perl-4:5.26.3-405.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSFixed in: rh-perl526-perl-Module-CoreList-1:5.20181130-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSFixed in: rh-perl524-perl-4:5.24.0-381.el7
View patch
redhatpatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: perl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: perl
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: redhat-virtualization-host
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: rhvm-appliance

Vendor Advisories (1)

redhatCVE-2018-18311Important

perl: Integer overflow leading to buffer overflow in Perl_my_setenv()

Nov 29, 2018

References

access.redhat.com / errata/RHBA-2019:0327
Third Party Advisory
access.redhat.com / errata/RHSA-2019:0001
Third Party Advisory
access.redhat.com / errata/RHSA-2019:0010
Third Party Advisory
access.redhat.com / errata/RHSA-2019:0109
Third Party Advisory
access.redhat.com / errata/RHSA-2019:1790
access.redhat.com / errata/RHSA-2019:1942
access.redhat.com / errata/RHSA-2019:2400
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
seclists.org / fulldisclosure/2019/Mar/49
Mailing ListThird Party Advisory
github.com / Perl/perl5/commit/34716e2a6ee2af96078d62b065b7785c001194be
PatchThird Party Advisory
kc.mcafee.com / corporate/index
Third Party Advisory
lists.debian.org / debian-lts-announce/2018/11/msg00039.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/RWQGEB543QN7SSBRKYJM6PSOC3RLYGSM
metacpan.org / changes/release/SHAY/perl-5.26.3
Third Party Advisory
metacpan.org / changes/release/SHAY/perl-5.28.1
Third Party Advisory
rt.perl.org / Ticket/Display.html
Issue TrackingThird Party Advisory
seclists.org / bugtraq/2019/Mar/42
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201909-01
security.netapp.com / advisory/ntap-20190221-0003
Third Party Advisory
support.apple.com / kb/HT209600
Third Party Advisory
usn.ubuntu.com / 3834-1
Third Party Advisory
usn.ubuntu.com / 3834-2
Third Party Advisory
debian.org / security/2018/dsa-4347
Third Party Advisory
oracle.com / security-alerts/cpuapr2020.html
oracle.com / security-alerts/cpujul2020.html
oracle.com / technetwork/security-advisory/cpujul2019-5072835.html
securityfocus.com / bid/106145
Third Party AdvisoryVDB Entry
securitytracker.com / id/1042181
Third Party AdvisoryVDB Entry