What’s Vulnerable › Vulnerabilities

CVE-2018-10887

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-10 · updated 2026-06-17
• Weakness: CWE-194

Description

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.

Affected products

• Debian Linux: 8.0, 9.0
• libgit2: before 0.27.3 — fixed in 0.27.3

How to fix

Upgrade to a fixed version: libgit2 0.27.3. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1598021
• https://github.com/libgit2/libgit2/commit/3f461902dc1072acb8b7607ee65d0a0458ffac2a
• https://github.com/libgit2/libgit2/commit/c1577110467b701dcbcf9439ac225ea851b47d22
• https://github.com/libgit2/libgit2/releases/tag/v0.27.3
• https://lists.debian.org/debian-lts-announce/2018/08/msg00024.html
• https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1598021
• https://github.com/libgit2/libgit2/commit/3f461902dc1072acb8b7607ee65d0a0458ffac2a
• https://github.com/libgit2/libgit2/commit/c1577110467b701dcbcf9439ac225ea851b47d22
• https://github.com/libgit2/libgit2/releases/tag/v0.27.3
• https://lists.debian.org/debian-lts-announce/2018/08/msg00024.html
• https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html

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