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Microsoft Security Response Center

Browse 17,903 advisories from this official source. Search by product, CVE, severity, or advisory ID.

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17,903 advisories

Each date says whether the vendor published or updated the bulletin. A vendor bulletin describes products that may be affected. It does not prove that the vulnerable product or version is installed in your environment.

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Microsoft Security Response CenterCVE-2026-33555
MediumCVSS 4.0

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.

Mariner

Affected productsazl3 haproxy 2.9.11-4 on Azure Linux 3.0, azl3 haproxy 2.9.11-5 on Azure Linux 3.0
Fixed versions2.9.11-5
Vendor guidance

CBL-Mariner Releases

CVE-2026-33555
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