https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Mon, 28 Sep 2026 17:46:38 +0000 https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-40164 <p><strong>Affected:</strong> Ubuntu:Pro:14.04:LTS: jq, Ubuntu:Pro:16.04:LTS: jq, Ubuntu:Pro:18.04:LTS: jq, Ubuntu:Pro:20.04:LTS: jq, Ubuntu:22.04:LTS: jq, Ubuntu:24.04:LTS: jq, Ubuntu:25.10: jq, Ubuntu:26.04:LTS: jq</p> <p>jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.</p> <p><strong>Affected:</strong> Ubuntu:Pro:14.04:LTS: jq, Ubuntu:Pro:16.04:LTS: jq, Ubuntu:Pro:18.04:LTS: jq, Ubuntu:Pro:20.04:LTS: jq, Ubuntu:22.04:LTS: jq, Ubuntu:24.04:LTS: jq, Ubuntu:25.10: jq, Ubuntu:26.04:LTS: jq</p> <p>jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.</p> https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-40164