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Fencer Vulns
high 7.5

CVE-2018-12015 json

In Perl through 5.26.2, the Archive::Tar module allows remote attackers to bypass a directory-traversal protection mechanism, and overwrite…

published 2018-06-07 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4007

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.3%
EPSS 7.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

In Perl through 5.26.2, the Archive::Tar module allows remote attackers to bypass a directory-traversal protection mechanism, and overwrite arbitrary files, via an archive file containing a symlink and a regular file with the same name.

Patch / fix

  • apple mac_os_x 10.14.4
  • perl Debian 14, Debian 13, Debian 12 5.26.2-6

debian advisories DEBIAN-CVE-2018-12015

  • perl Ubuntu 14.04 LTS 5.18.2-2ubuntu1.6
  • perl Ubuntu 16.04 LTS 5.22.1-9ubuntu0.5
  • perl Ubuntu 18.04 LTS 5.26.1-6ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-12015

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl hummingbird 1 5.42.2-524.1.hum1
  • perl-B hummingbird 1 1.89-524.1.hum1
  • perl-if hummingbird 1 0.61.000-524.1.hum1
  • perl-IO hummingbird 1 1.55-524.1.hum1
  • perl-ph hummingbird 1 5.42.2-524.1.hum1
  • perl-lib hummingbird 1 0.65-524.1.hum1
  • perl-mro hummingbird 1 1.29-524.1.hum1
  • perl-Net hummingbird 1 1.04-524.1.hum1

red hat advisories RHSA-2026:7604RHSA-2019:2097

  • perl SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +8 more 5.18.2-12.14.1
  • perl SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 5.10.0-64.81.13.1
  • perl SLE Module for Development Tools 15, SLE Module for Basesystem 15 5.26.1-7.3.1

suse advisories SUSE-SU-2018:1972-2SUSE-SU-2018:1992-1SUSE-SU-2018:1972-1SUSE-SU-2018:1977-1

  • perl Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 5.26.2-r1
  • perl Alpine 3.6, Alpine 3.5 5.24.4-r1

alpine advisories ALPINE-CVE-2018-12015

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-12015 updated cvss 5.4

perl: Directory traversal in Archive::Tar

  • Red Hat Enterprise Linux 5 perl-Archive-Tar Red Hat Enterprise Linux 6 perl, perl-CGI, perl-core, perl-CPAN, perl-libs, perl-parent, +39 more
    affected: no fix planned “Will not fix”
  • Red Hat Software Collections rh-perl520-perl-Archive-Tar, rh-perl524-perl-Archive-Tar, rh-perl526-perl-Archive-Tar
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) perl-Archive-Tar 1.92-3.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perl-Archive-Tar 1.92-3.el7 Red Hat Enterprise Linux Server (v. 7) perl-Archive-Tar 1.92-3.el7 Red Hat Enterprise Linux Workstation (v. 7) perl-Archive-Tar 1.92-3.el7
    fixed: vendor fix RHSA-2019:2097
  • Red Hat Hardened Images perl 5.42.2-524.1.hum1, perl-B 1.89-524.1.hum1, perl-IO 1.55-524.1.hum1, perl-Tie 4.6-524.1.hum1, perl-lib 0.65-524.1.hum1, perl-mro 1.29-524.1.hum1, +93 more
    fixed: vendor fix RHSA-2026:7604
  • Red Hat Enterprise Linux 8 perl-Archive-Tar Red Hat Software Collections rh-perl530-perl-Archive-Tar
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.31% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.debian.org https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900834 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:N/I:P/A:P

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.