## Pillow: Quadratic GIF comment copying during save

- 種別: advisory
- 重大度: medium
- 関連技術: python
- CVE: CVE-2026-112891
- 公開日時: 2026-10-21T20:38:43.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-fc9g-5qg7-mf45)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-fc9g-5qg7-mf45

影響: pip:pillow >= 9.2.0, < 13.0.0 → 13.0.0
On Pillow 12.3.0 and upstream main (ad277e2761b489681e71b51e91367d46b0ceabb9), a GIF with a long comment makes _get_global_header() copy portions of the comment repeatedly when saving, including comments carried over from untrusted images. I suggest provisional Moderate severity for crafted-image CPU denial of service, with CVSS-B 6.9 assuming a network service automatically opens unauthenticated uploads and they are resaved as GIFs; impact depends on input-size, concurrency, and worker CPU lim…