CVE-2018-11489: giflib_project giflib Improper Validation of Array Index
Vulnerability summary
CVE-2018-11489 is a high (CVSS 8.8) Improper Validation of Array Index vulnerability in giflib_project giflib. EPSS estimates a 2.47% chance of exploitation in the next 30 days, higher than 84.2% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 26-05-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.47%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
-0.09 pp
From 2.56% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundSam2P
Maturity: poc
Weaknesses
CWE · root cause- CWE-129Improper Validation of Array IndexThe product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Debian1 product
- giflib< 4.1.4-1
Giflib_project1 product
- giflib≥ 3.0, ≤ 3.1.1
Sam2p_project1 product
- sam2p0.49.4
Ubuntu1 product
- giflib< 5.1.4-0.3~16.04.1 | < 5.1.4-2ubuntu0.1 | < 5.1.9-1
4 vendors · 4 products
