Vulnerability · Published Mar 24, 2026 · Assigned by GovTech CSG
CVE-2026-4738GDAL Bundled zlib (inftree9.c) Pointer Offset Optimization Undefined Behavior Allows Heap Corruption or Remote Code Execution
Critical 9.4
In plain English
A critical-severity memory corruption in gdal from OSGeo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)0.3%top 81.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in OSGeo gdal (frmts/zlib/contrib/infback9 modules). This vulnerability is associated with program files inftree9.C. This issue affects gdal: before 3.11.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | zlib | 1.4-r0 | ALPINE-CVE-2026-4738 |
| Alpine:v3.22 | zlib | 1.4-r0 | ALPINE-CVE-2026-4738 |
| Alpine:v3.23 | zlib | 1.4-r0 | ALPINE-CVE-2026-4738 |
| Alpine:v3.24 | zlib | 1.4-r0 | ALPINE-CVE-2026-4738 |
| Debian:12 | gdal | no fix listed | DEBIAN-CVE-2026-4738 |
| Debian:13 | gdal | no fix listed | DEBIAN-CVE-2026-4738 |
| Debian:14 | gdal | 3.11.3+dfsg-1 | DEBIAN-CVE-2026-4738 |
| Ubuntu:25.10 | gdal | no fix listed | UBUNTU-CVE-2026-4738 |
Affected products (as reported)
Weakness: CWE-119 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:P/AU:Y/R:U/V:C/RE:L/U:Amber