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Fencer Vulns
high 7.5

CVE-2018-15501 json

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…

published 2018-08-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7378

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • libgit2 libgit2 0.26.6, 0.27.4
  • libgit2 Debian 14, Debian 13, Debian 12 0.27.4+dfsg.1-0.1

debian advisories DEBIAN-CVE-2018-15501

  • libgit2 Ubuntu Pro 14.04 LTS 0.19.0-2ubuntu0.4+esm2
  • libgit2 Ubuntu Pro 16.04 LTS 0.24.1-2ubuntu0.2+esm3
  • libgit2 Ubuntu Pro 18.04 LTS 0.26.0+dfsg.1-1.1ubuntu0.2+esm2

ubuntu advisories UBUNTU-CVE-2018-15501

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libgit2 SLE Software Development Kit 12 SP3, Manager Server 3.2, Manager Server 3.1 0.24.1-7.6.1
  • libgit2 SLE Module for Development Tools 15 0.26.6-3.5.2

suse advisories SUSE-SU-2018:3440-1SUSE-SU-2018:2469-1

  • libgit2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 0.27.4-r0
  • libgit2-1.0 Alpine 3.14, Alpine 3.13 0.27.4-r0
  • libgit2-1.1 Alpine 3.16, Alpine 3.15 0.27.4-r0
  • libgit2-0.27 Alpine 3.10 0.27.4-r0

alpine advisories ALPINE-CVE-2018-15501

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-15501 updated cvss 5.3

libgit2: out-of-bounds reads when processing smart-protocol ng packets

  • Red Hat Enterprise Linux 8 libgit2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.37% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.