---
title: "CVE-2018-8098\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-8098?format=md
keywords: index, follow
---

# CVE-2018-8098

Publication date 14 March 2018

Last updated 13 August 2026

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-8098?format=md#impact-score)

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## 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](https://ubuntu.com/security/CVE-2018-8098?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libgit2 | 26.04 LTS resolute | Not affected |
| 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 | Fixed 0.26.0+dfsg.1-1.1ubuntu0.2+esm2  Ubuntu Pro |
| 17.10 artful | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

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## Notes

---

### [msalvatore](https://launchpad.net/~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

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8098)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-8098)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-8098)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-8098)

### Related Ubuntu Security Notices (USN)

+ [USN-8628-1](https://usn.ubuntu.com/USN-8628-1)
+ libgit2 vulnerabilities
+ 12 August 2026

### Other references

* <https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900c1>
* <https://github.com/libgit2/libgit2/commit/3db1af1f370295ad5355b8f64b865a2a357bcac0>
* <https://libgit2.github.com/security/>
* <https://www.cve.org/CVERecord?id=CVE-2018-8098>