Description
The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| github.com/shamaton/msgpack | github.com/shamaton/msgpack | — | — |
| github.com/shamaton/msgpack/v2 | github.com/shamaton/msgpack/v2 | < 2.4.1 | 2.4.1 |
| github.com/shamaton/msgpack/v3 | github.com/shamaton/msgpack/v3 | < 3.1.1 | 3.1.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260326T203309-150000.1.155.2 | SUSE-SU-2026:1135-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | flyte | 1.16.7-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/shamaton/msgpack | all versions | — | GO-2026-4513 |
| Go | github.com/shamaton/msgpack/v2 | <= 2.4.0 | — | GHSA-h9q6-hc68-35rp |
| Go | github.com/shamaton/msgpack/v2 | < 2.4.1 | 2.4.1 | GO-2026-4513 |
| Go | github.com/shamaton/msgpack/v3 | <= 3.1.0 | — | GHSA-h9q6-hc68-35rp |
| Go | github.com/shamaton/msgpack/v3 | < 3.1.1 | 3.1.1 | GO-2026-4513 |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:1135-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 31, 2026