CVE-2017-5923

libyara/grammar.y in YARA 3.5.0 allows remote attackers to cause a denial of service (heap-based...

7.5 HighFix available

libyara/grammar.y in YARA 3.5.0 allows remote attackers to cause a denial of service (heap-based out-of-bounds read and application crash) via a crafted rule that is mishandled in the yara_yyparse function.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.63%Up 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2017-5923
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-125
Updated: 2026-11-02

CVE List No score

Record: CVE-2017-5923
Updated: 2026-11-02

EUVDEUVD-2017-14998 No score

Record: EUVD-2017-14998
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x9r6-fxx3-q7m8 7.5

libyara/grammar.y in YARA 3.5.0 allows remote attackers to cause a denial of service (heap-based...

Record: GHSA-x9r6-fxx3-q7m8
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

OSV 7.5

Record: CVE-2017-5923
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-5923 7.5

Record: DEBIAN-CVE-2017-5923
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-5923 7.5

Record: UBUNTU-CVE-2017-5923
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

virustotal yara

Affected packages

Affected packages
Package	Affected	Fixed
`yara` Debian:12	before 3.5.0+dfsg-9	3.5.0+dfsg-9
`yara` Debian:13	before 3.5.0+dfsg-9	3.5.0+dfsg-9
`yara` Debian:14	before 3.5.0+dfsg-9	3.5.0+dfsg-9
`yara` Ubuntu:Pro:16.04:LTS	before 3.4.0+dfsg-2ubuntu0.1~esm1, plus listed versions 3.4.0+dfsg-23.4.0+dfsg-2build1	3.4.0+dfsg-2ubuntu0.1~esm1

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-2017-5923 is a high vulnerability (CVSS 7.5) in Virustotal Yara, published April 3, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.63%, the 76th percentile. Fixed in yara 3.5.0+dfsg-9.