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CVE-2018-18312

38
FAUCET Score

CVE-2018-18312 is a critical buffer overflow vulnerability affecting Perl versions before 5.26.3 and 5.28.1, specifically impacting products like Debian, Red Hat, and NetApp. This flaw, rated 9.8 CVSS, allows unauthenticated attackers to trigger invalid write operations via crafted regular expressions, leading to high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

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:*:*:*:*:*:*:*:*
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

9.8CRITICAL

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
12.09%
Probability of exploitation in next 30 days
EPSS Percentile
95.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.1209 is in the 92nd percentile among its peer group of 36,821 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 (13)

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

Vendor Advisories (1)

redhatCVE-2018-18312Moderate

perl: Heap-based buffer overflow in S_handle_regex_sets()

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 TrackingThird 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 / Public/Bug/Display.html
ExploitPatchThird Party Advisory
security.gentoo.org / glsa/201909-01
security.netapp.com / advisory/ntap-20190221-0003
Third Party Advisory
usn.ubuntu.com / 3834-1
Third Party Advisory
debian.org / security/2018/dsa-4347
Third Party Advisory
oracle.com / security-alerts/cpujul2020.html
securityfocus.com / bid/106179
Third Party AdvisoryVDB Entry
securitytracker.com / id/1042181
Third Party AdvisoryVDB Entry