CVE-2018-8098

Publication date 14 March 2018

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libgit2	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Vulnerable
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Vulnerable

Notes

msalvatore

Downgrading to low: "As the index is never transferred via the network, exploitation requires an attacker to have access to the local repository."

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H