CVE-2018-15501

Name: CVE-2018-15501
Creator: NVD / NIST
Published: 2018-08-18T02:29:01.713+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.34%

Last modified Jun 17, 2026

CVE-2018-15501 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol "ng" packet that lacks a '\0' byte to trigger an out-of-bounds read that leads to DoS.. EPSS estimates a 4.34% chance of exploitation in the next 30 days.

Description

In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol "ng" packet that lacks a '\0' byte to trigger an out-of-bounds read that leads to DoS.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.34%

90.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Libgit2	Libgit2	< 0.26.6
Libgit2	Libgit2	>= 0.27.0, < 0.27.4

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406Exploit, Issue Tracking, Patch, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1104641Issue Tracking, Patch, Third Party Advisory
https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649Patch, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v0.26.6Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v0.27.4Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00024.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00031.htmlMailing List, Third Party Advisory
https://www.pro-linux.de/sicherheit/2/44650/denial-of-service-in-libgit2.htmlThird Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406Exploit, Issue Tracking, Patch, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1104641Issue Tracking, Patch, Third Party Advisory
https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649Patch, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v0.26.6Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v0.27.4Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00024.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00031.htmlMailing List, Third Party Advisory
https://www.pro-linux.de/sicherheit/2/44650/denial-of-service-in-libgit2.htmlThird Party Advisory

Timeline

Published: Aug 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15501?

How severe is CVE-2018-15501?

CVE-2018-15501 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.34% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15501?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-15501?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST