CVE-2026-33555
| Summary |
An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6.
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| Publication Date |
April 14, 2026, 2:16 a.m. |
| Registration Date |
April 15, 2026, 11:38 a.m. |
| Last Update |
April 18, 2026, 12:38 a.m. |
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CVSS3.1 : MEDIUM
|
| スコア |
4.0
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| Vector |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
| 攻撃元区分(AV) |
ネットワーク |
| 攻撃条件の複雑さ(AC) |
高 |
| 攻撃に必要な特権レベル(PR) |
不要 |
| 利用者の関与(UI) |
不要 |
| 影響の想定範囲(S) |
変更あり |
| 機密性への影響(C) |
なし |
| 完全性への影響(I) |
低 |
| 可用性への影響(A) |
なし |
Related information, measures and tools
Common Vulnerabilities List