CVE-2026-63209
Published: October 2, 2026Last modified: October 20, 2026
Description
compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | buildah | Not affected (1.28.0-r1) |
| containerd | Not affected (1.6.10-r0) | ||
| docker | Not affected (20.10.21-r1) | ||
| podman | Not affected (4.3.1-r0) | ||
| skopeo | Not affected (1.10.0-r2) | ||
| 25 LTS | buildah | Not affected (1.40.0-r0) | |
| containerd | Not affected (2.1.1-r0) | ||
| docker | Not affected (28.2.1-r0) | ||
| docker-cli-buildx | Not affected (0.24.0-r0) | ||
| etcd | Not affected (3.6.4-r6) | ||
| helm | Not affected (3.19.0-r4) | ||
| osv-scanner | Not affected (2.1.0-r4) | ||
| podman | Not affected (5.5.0-r0) | ||
| skopeo | Not affected (1.18.0-r2) | ||
| Stream | buildah | Not affected (1.31.0-r0) | |
| containerd | Not affected (1.7.2-r1) | ||
| docker | Not affected (24.0.2-r0) | ||
| docker-cli-buildx | Not affected (0.11.0-r0) | ||
| etcd | Not affected (3.6.4-r6) | ||
| grype | Not affected (0.100.0-r0) | ||
| helm | Not affected (3.19.0-r4) | ||
| osv-scanner | Not affected (2.1.0-r2) | ||
| podman | Not affected (4.5.1-r1) | ||
| skopeo | Not affected (1.13.0-r1) |