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Fencer Intel
high 8.1

CVE-2018-10887 json

A flaw was found in libgit2 before version 0.27.3.

published 8y ago modified 4mo ago also EUVD-2018-2951

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.

Patch / fix

  • libgit2 libgit2 0.27.3
  • libgit2 Debian 14, Debian 13, Debian 12 0.27.4+dfsg.1-0.1

debian advisories DEBIAN-CVE-2018-10887

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

ubuntu advisories UBUNTU-CVE-2018-10887

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 openSUSE Tumbleweed 1.1.1-1.2

opensuse advisories openSUSE-SU-2024:10943-1

  • libgit2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 0.27.3-r0
  • libgit2-1.0 Alpine 3.14, Alpine 3.13 0.27.3-r0
  • libgit2-1.1 Alpine 3.16, Alpine 3.15 0.27.3-r0
  • libgit2-0.27 Alpine 3.10 0.27.3-r0

alpine advisories ALPINE-CVE-2018-10887

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

Is CVE-2018-10887 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2018-10887 updated cvss 5.3

libgit2: integer overflow leads to out-of-bounds read in git_delta_apply, allowing to read before base array

  • Red Hat All currently supported Red Hat products
    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

2.05% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:N/A:P

Affected products

  • libgit2 libgit2

Classification

Weakness
  • CWE-194 Unexpected Sign Extension
  • CWE-125 Out-of-bounds Read
  • CWE-190 Integer Overflow or Wraparound
  • CWE-681 Incorrect Conversion between Numeric Types

References

Sources

Fencer Intel 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.