CVE-2018-15501

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-08-18 · updated 2026-06-17
Weakness: CWE-125

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.

Affected products

Debian Linux: 8.0, 9.0
libgit2: before 0.26.6; from 0.27.0 before 0.27.4 — fixed in 0.26.6, 0.27.4

How to fix

Upgrade to a fixed version: libgit2 0.26.6, 0.27.4. Check the vendor advisory for mitigations.

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406
https://bugzilla.suse.com/show_bug.cgi?id=1104641
https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649
https://github.com/libgit2/libgit2/releases/tag/v0.26.6
https://github.com/libgit2/libgit2/releases/tag/v0.27.4
https://lists.debian.org/debian-lts-announce/2018/08/msg00024.html
https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html
https://www.pro-linux.de/sicherheit/2/44650/denial-of-service-in-libgit2.html
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406
https://bugzilla.suse.com/show_bug.cgi?id=1104641
https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649
https://github.com/libgit2/libgit2/releases/tag/v0.26.6

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