# CVE-2026-116591: compress zstd: Panic on two-block frames

CVE-2026-116591 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-116591, released November 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-116591
- Priority: Routine
- CVSS: n/a (Moderate)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 26, 2026
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-116591

## Description

compress provides various compression algorithms. Prior to 1.20.2, the zstd DecodeAll and streaming decoder paths can panic when a crafted two-block frame reaches huff0.ReadTable with an FSE normalized count of 32768 that readNCount stores in int16 as -32768. The wrapped count allows buildDtable to retain stale fse.Scratch decode-table state from the prior block, and nextFast then derives an out-of-range state and indexes beyond the table instead of returning a decode error. Both blocks are required to preserve and then reuse the stale state, allowing untrusted zstd input to crash an application. This issue is fixed in version 1.20.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cadvisor opensuse-leap 16.0 | 0.60.6-bp160.4.1 | [OPENSUSE-SU-2026:22218-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22218-1.md) | Nov 7, 2026 |
| Linux | go-containerregistry opensuse-leap 16.0 | 0.22.1-bp160.1.1 | [OPENSUSE-SU-2026:22227-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22227-1.md) | Nov 7, 2026 |
| Linux | golang-github-klauspost-compress Debian 14 | 1.20.3+ds1-1 | [DEBIAN-CVE-2026-116591](https://patchblox.com/security/data/fix/linux/debian-cve-2026-116591.md) | Nov 1, 2026 |
| Linux | hauler opensuse-leap 16.0 | 2.1.2-bp160.2.1 | [OPENSUSE-SU-2026:22228-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22228-1.md) | Nov 7, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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