Memory exhaustion when compiling regular expressions in regexp/syntax

高 7.5CVE-2022-41715 · BIT-golang-2022-41715 · GO-2022-1039 · 14/10/2022 公開 · 17/06/2026 更新

要点

CVE-2022-41715 は stdlib, go (golang) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.7%（全脆弱性の 77.5% より高い）。
対処：1.19.2, 1.18.7 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
stdlib Go	`≥ 1.19.0-0, < 1.19.2< 1.18.7`	`1.19.21.18.7`
go golang	`≥ 1.19.0, < 1.19.2< 1.18.7`	`1.19.21.18.7`

概要

Programs which compile regular expressions from untrusted sources may be vulnerable to memory exhaustion or denial of service.

The parsed regexp representation is linear in the size of the input, but in some cases the constant factor can be as high as 40,000, making relatively small regexps consume much larger amounts of memory.

After fix, each regexp being parsed is limited to a 256 MB memory footprint. Regular expressions whose representation would use more space than that are rejected. Normal use of regular expressions is unaffected.

NVD の説明

Programs which compile regular expressions from untrusted sources may be vulnerable to memory exhaustion or denial of service. The parsed regexp representation is linear in the size of the input, but in some cases the constant factor can be as high as 40,000, making relatively small regexps consume much larger amounts of memory. After fix, each regexp being parsed is limited to a 256 MB memory footprint. Regular expressions whose representation would use more space than that are rejected. Normal use of regular expressions is unaffected.