CVE-2018-11489

The DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later...

8.8 HighFix available

The DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later shipped in cgif.c in sam2p 0.49.4, has a heap-based buffer overflow because a certain CrntCode array index is not checked. This will lead to a denial of service or possibly unspecified other impact.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.45%Up 1.4 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

Record: CVE-2018-11489
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-129, CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-11489
Updated: 2026-11-02

EUVDEUVD-2018-3520 No score

Record: EUVD-2018-3520
Updated: 2026-11-03

GitHub AdvisoriesGHSA-w8g7-8frf-5h65 8.8

The DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later...

Record: GHSA-w8g7-8frf-5h65
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

OSV 8.8

Record: CVE-2018-11489
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-11489 8.8

Record: DEBIAN-CVE-2018-11489
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-11489 8.8

Record: UBUNTU-CVE-2018-11489
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`giflib` Debian:12	before 4.1.4-1	4.1.4-1
`giflib` Debian:13	before 4.1.4-1	4.1.4-1
`giflib` Debian:14	before 4.1.4-1	4.1.4-1

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-11489 is a high vulnerability (CVSS 8.8) in Giflib Project Giflib, published May 26, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.45%, the 84th percentile. Fixed in giflib 4.1.4-1.