CVE-2018-10887

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.1%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
42
EG Risk 42/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.1%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 10, 2018

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat, github_commit, github_release.
github_release Patch Available

libgit2 v0.27.3

Patch available: libgit2/libgit2 v0.27.3

https://github.com/libgit2/libgit2/releases/tag/v0.27.3
github_commit

commit c1577110467b (libgit2/libgit2)

Fix landed in libgit2/libgit2 commit c1577110467b — awaiting tagged release

https://github.com/libgit2/libgit2/commit/c1577110467b701dcbcf9439ac225ea851b47d22
github_commit

commit 3f461902dc10 (libgit2/libgit2)

Fix landed in libgit2/libgit2 commit 3f461902dc10 — awaiting tagged release

https://github.com/libgit2/libgit2/commit/3f461902dc1072acb8b7607ee65d0a0458ffac2a
redhatMentions a patch (unverified)

1598021 – (CVE-2018-10887) CVE-2018-10887 libgit2: integer overflow leads to out-of-bounds read in git_delta_apply, allowing to read before base array

https://bugzilla.redhat.com/show_bug.cgi?id=1598021
genericMentions a patch (unverified)

[SECURITY] [DLA 2936-1] libgit2 security update

https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html
genericMentions a patch (unverified)

[SECURITY] [DLA 1477-1] libgit2 security update

https://lists.debian.org/debian-lts-announce/2018/08/msg00024.html

Affected Packages

(10 across 10 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.23.2-r0 ... 0.27.2-r0 (19 versions)
  • every version up to 0.27.3-r0: fixed in 0.27.3-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.23.2-r0 ... 0.27.2-r0 (19 versions)
  • every version up to 0.27.3-r0: fixed in 0.27.3-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.23.2-r0 ... 0.27.2-r0 (19 versions)
  • every version up to 0.27.3-r0: fixed in 0.27.3-r0
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.23.2-r0 ... 0.27.2-r0 (19 versions)
  • every version up to 0.27.3-r0: fixed in 0.27.3-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libgit2—
  • every version up to 0.27.4+dfsg.1-0.1: fixed in 0.27.4+dfsg.1-0.1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libgit2—
  • every version up to 0.27.4+dfsg.1-0.1: fixed in 0.27.4+dfsg.1-0.1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libgit2—
  • every version up to 0.27.4+dfsg.1-0.1: fixed in 0.27.4+dfsg.1-0.1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libgit2—
  • every version up to 0.27.4+dfsg.1-0.1: fixed in 0.27.4+dfsg.1-0.1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.21.1-3
  • every version up to 0.21.1-3+deb8u1: fixed in 0.21.1-3+deb8u1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
libgit20.25.1+really0.24.6-1
  • every version up to 0.25.1+really0.24.6-1+deb9u1: fixed in 0.25.1+really0.24.6-1+deb9u1
—

Weakness Classification(4)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
  2. 2026-10-08 16:36 UTCEPSS rescore
  3. 2026-10-07 23:41 UTCEPSS rescore
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  10. 2026-09-30 09:51 UTCEG score recompute
  11. 2026-09-28 23:08 UTCOSV refresh
  12. 2026-09-28 13:45 UTCEPSS rescore
  13. 2026-09-27 13:40 UTCEPSS rescore
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  24. 2026-09-15 03:05 UTCEPSS rescore
  25. 2026-09-13 16:42 UTCEPSS rescore
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  1. 2026-09-12 14:56 UTCEPSS rescore
  2. 2026-09-11 09:31 UTCEPSS rescore
  3. 2026-09-09 04:46 UTCOSV refresh
  4. 2026-09-07 15:56 UTCEPSS rescore
  5. 2026-09-05 15:24 UTCEPSS rescore
  6. 2026-09-04 13:56 UTCEPSS rescore
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  8. 2026-09-02 14:07 UTCEPSS rescore
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  10. 2026-09-01 03:31 UTCEPSS rescore
  11. 2026-08-30 19:13 UTCEPSS rescore
  12. 2026-08-28 21:36 UTCEPSS rescore
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  17. 2026-08-22 13:07 UTCOSV refresh
  18. 2026-08-21 23:44 UTCEPSS rescore
  19. 2026-08-19 16:59 UTCEPSS rescore
  20. 2026-08-18 13:43 UTCEPSS rescore
  21. 2026-08-16 14:51 UTCEPSS rescore
  22. 2026-08-16 02:10 UTCEPSS rescore
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  24. 2026-08-12 13:46 UTCEPSS rescore
  25. 2026-08-09 13:42 UTCEPSS rescore
  26. 2026-08-08 16:32 UTCEPSS rescore
  27. 2026-08-07 16:22 UTCEPSS rescore
  28. 2026-08-06 16:35 UTCOSV refresh
  29. 2026-08-06 13:42 UTCEPSS rescore
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  37. 2026-07-28 15:32 UTCEPSS rescore
  38. 2026-07-26 14:51 UTCEPSS rescore
  39. 2026-07-26 14:51 UTCEPSS rescore
  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 01:32 UTCEG score recompute
  42. 2026-07-22 22:12 UTCEG score recompute
  43. 2026-07-22 14:04 UTCEPSS rescore
  44. 2026-07-21 15:21 UTCEPSS rescore
  45. 2026-07-21 09:17 UTCOSV refresh
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-19 14:28 UTCEPSS rescore
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  50. 2026-07-19 02:26 UTCEPSS rescore
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  52. 2026-07-18 10:01 UTCEPSS rescore
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  61. 2026-07-12 05:43 UTCEPSS rescore
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  63. 2026-07-09 19:06 UTCEPSS rescore
  64. 2026-07-08 15:11 UTCEPSS rescore
  65. 2026-07-07 13:42 UTCEPSS rescore
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  71. 2026-07-04 06:28 UTCEPSS rescore
  72. 2026-07-04 06:28 UTCEPSS rescore
  73. 2026-07-04 04:26 UTCOSV refresh
  74. 2026-07-02 16:54 UTCEPSS rescore
  75. 2026-07-01 15:03 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-10887?
CVE-2018-10887 is a high vulnerability published on July 10, 2018. A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in gitdeltaapply 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…
When was CVE-2018-10887 disclosed?
CVE-2018-10887 was first published on July 10, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-10887 actively exploited?
CVE-2018-10887 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.1% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-10887?
CVE-2018-10887 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2018-10887?
A fix for CVE-2018-10887 is available: update to the fixed version the vendor names in its advisory.

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