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CVE-2018-18313

33
FAUCET Score

CVE-2018-18313 is a critical buffer over-read vulnerability affecting Perl versions prior to 5.26.3, impacting various products from vendors like Apple, Debian, and Red Hat. This flaw allows an unauthenticated attacker to craft a malicious regular expression, leading to the disclosure of sensitive information from process memory and potentially causing a denial of service. Despite its critical CVSS score of 9.1 and high FAUCET Risk Score of 79/100, there is 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:*:*:*:*:*:*:*:*
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:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
9.52%
Probability of exploitation in next 30 days
EPSS Percentile
94.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0952 is in the 90th percentile among its peer group of 36,862 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 (15)

github_advisorypatch availablevia nvd_reference
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 nvd_reference
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

Vendor Advisories (1)

redhatCVE-2018-18313Low

perl: Heap-based buffer read overflow in S_grok_bslash_N()

Nov 29, 2018

References

access.redhat.com / errata/RHSA-2019:0001
Third Party Advisory
access.redhat.com / errata/RHSA-2019:0010
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
seclists.org / fulldisclosure/2019/Mar/49
Third Party Advisory
github.com / Perl/perl5/commit/43b2f4ef399e2fd7240b4eeb0658686ad95f8e62
PatchThird 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
rt.perl.org / Ticket/Display.html
ExploitThird 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/cpujul2020.html
securitytracker.com / id/1042181
Third Party AdvisoryVDB Entry