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Fencer Vulns
critical 9.8

CVE-2018-11236 json

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realp…

published 2018-05-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-3276

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.9%
EPSS 6.9% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.

Patch / fix

  • glibc Debian 14, Debian 13, Debian 12 2.27-4

debian advisories DEBIAN-CVE-2018-11236

  • glibc Ubuntu 16.04 LTS 2.23-0ubuntu11.2
  • glibc Ubuntu 18.04 LTS 2.27-3ubuntu1.2
  • eglibc Ubuntu Pro 14.04 LTS 2.19-0ubuntu6.15+esm3

ubuntu advisories UBUNTU-CVE-2018-11236

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

  • glibc RHEL 7 2.17-260.el7
  • nscd RHEL 7 2.17-260.el7
  • glibc-utils RHEL 7 2.17-260.el7
  • glibc-common RHEL 7 2.17-260.el7
  • glibc-debuginfo-common RHEL 7 2.17-260.el7

red hat advisories RHSA-2018:3092

  • glibc SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +6 more 2.22-62.13.2
  • glibc SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 2.11.3-17.110.14.1
  • glibc SLE Module for Development Tools 15, SLE Module for Basesystem 15 2.26-13.3.1
  • glibc SLES 12-LTSS 2.19-22.27.958
  • glibc SLES for SAP 12 SP1, SLES 12 SP1-LTSS 2.19-40.16.950

suse advisories SUSE-SU-2018:1562-2SUSE-SU-2018:2302-1SUSE-SU-2018:2187-1SUSE-SU-2018:2185-1SUSE-SU-2018:1991-1SUSE-SU-2018:1562-1

  • glibc openSUSE Tumbleweed 2.34-1.2

opensuse advisories openSUSE-SU-2024:10792-1

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-2018-11236 updated cvss 7.8

glibc: Integer overflow in stdlib/canonicalize.c on 32-bit architectures leading to stack-based buffer overflow

  • Red Hat Enterprise Linux 5 glibc Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, glibc-common
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) nscd 2.17-260.el7, glibc 2.17-260.el7, glibc-utils 2.17-260.el7, glibc-common 2.17-260.el7, glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux Client Optional (v. 7) glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux ComputeNode (v. 7) nscd 2.17-260.el7, glibc 2.17-260.el7, glibc-utils 2.17-260.el7, glibc-common 2.17-260.el7, glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) nscd 2.17-260.el7, glibc 2.17-260.el7, glibc-utils 2.17-260.el7, glibc-common 2.17-260.el7, glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) glibc-debuginfo-common 2.17-260.el7
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) nscd 2.17-260.el7, glibc 2.17-260.el7, glibc-utils 2.17-260.el7, glibc-common 2.17-260.el7, glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux Server Optional (v. 7) glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux Workstation (v. 7) nscd 2.17-260.el7, glibc 2.17-260.el7, glibc-utils 2.17-260.el7, glibc-common 2.17-260.el7, glibc-debuginfo-common 2.17-260.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) glibc-debuginfo-common 2.17-260.el7
    fixed: vendor fix RHSA-2018:3092
  • Red Hat Enterprise Linux 5 compat-glibc Red Hat Enterprise Linux 6 compat-glibc Red Hat Enterprise Linux 7 compat-glibc Red Hat Enterprise Linux 8 nscd, glibc, libnsl, nss_db, nss_hesiod, glibc-utils, +7 more
    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

6.92% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

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.