CVE-2018-12495

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers...

5.5 MediumFix available

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.82%Up 0.5 points since Apr 14, 2021

What each source reports

NVD Score used 5.5

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: CVE-2018-12495
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-125
Updated: 2026-11-02

CVE List No score

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: CVE-2018-12495
Updated: 2026-11-02

EUVDEUVD-2018-4465 No score

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: EUVD-2018-4465
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mvx5-vrw8-j3pj 5.5

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers...

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: GHSA-mvx5-vrw8-j3pj
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

OSV 5.5

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: CVE-2018-12495
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-12495 5.5

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: DEBIAN-CVE-2018-12495
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

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OSVUBUNTU-CVE-2018-12495 5.5

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file.

Record: UBUNTU-CVE-2018-12495
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVMGASA-2019-0020 No score

Updated discount packages fix security vulnerabilities

The __mkd_trim_line function in mkdio.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file (CVE-2018-11468).

DISCOUNT through version 2.2.3a is vulnerable to a Heap-based buffer-overflow in the markdown.c:isfootnote() function. An attacker could exploit this to cause a denial of service (CVE-2018-11503).

DISCOUNT through version 2.2.3a is vulnerable to a Heap-based buffer-overflow in the markdown.c:islist() function. An attacker could exploit this to cause a denial of service (CVE-2018-11504).

The quoteblock function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file (CVE-2018-12495).

Record: MGASA-2019-0020
Updated: 2026-11-02

OSVopenSUSE-SU-2019:0019-1 No score

Security update for discount

This update for discount to version 2.2.4 fixes the following issues:

Security issues fixed:

CVE-2018-11468: Fixed a heap-based buffer over-read in the __mkd_trim_line function from mkdio.c (boo#1094809)
CVE-2018-12495: Fixed a heap-based buffer over-read via a crafted file (boo#1098252)

Record: openSUSE-SU-2019:0019-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:10718-1 No score

discount-2.2.7-1.3 on GA media

These are all security issues fixed in the discount-2.2.7-1.3 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10718-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`discount` Debian:12	before 2.2.4-1	2.2.4-1
`discount` Debian:13	before 2.2.4-1	2.2.4-1
`discount` Debian:14	before 2.2.4-1	2.2.4-1
`discount` Debian:8	before 2.1.7-1+deb8u1, plus listed versions 2.1.7-1	2.1.7-1+deb8u1
`discount` Debian:9	before 2.2.2-1+deb9u1, plus listed versions 2.2.2-1	2.2.2-1+deb9u1
`discount` Mageia:6	before 2.2.4-1.mga6	2.2.4-1.mga6
`discount` Ubuntu:14.04:LTS	before 2.1.7-1+deb8u1build0.14.04.1, plus listed versions 2.1.6-22.1.7-1	2.1.7-1+deb8u1build0.14.04.1
`discount` Ubuntu:16.04:LTS	All versions, plus listed versions 2.1.8-2	None known
`discount` Ubuntu:18.04:LTS	All versions, plus listed versions 2.1.8-22.2.3b8-2	None known
`discount` SUSE:Package Hub 15	before 2.2.4-bp150.3.3.1	2.2.4-bp150.3.3.1
`discount` openSUSE:Leap 15.0	before 2.2.4-bp150.3.3.1	2.2.4-bp150.3.3.1
`discount` openSUSE:Tumbleweed	before 2.2.7-1.3	2.2.7-1.3

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-12495 is a medium vulnerability (CVSS 5.5) in Discount Project Discount, published June 15, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.82%, the 78th percentile. Fixed in discount 2.2.4-1.

References

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