HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-43966, affects Microsoft product version 3.0. It involves HTTP response splitting due to the handling of non-VCHAR bytes in the cow_http_struct_hd:escape_string/2 function. The issue is categorized under CWE-113, indicating improper neutralization of CRLF sequences in HTTP headers, which can lead to HTTP response splitting attacks. No CVSS score or detailed vendor advisory is available, and no patch or fix has been disclosed. The vulnerability is not related to a cloud service, and no known exploits have been reported.
Potential Impact
If exploited, this vulnerability could allow an attacker to manipulate HTTP responses by injecting crafted headers or content, potentially leading to web cache poisoning, cross-site scripting, or other HTTP header injection attacks. However, no known exploits are currently reported, and the exact impact depends on the context of use in the affected software.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch information is provided, users should monitor Microsoft Security Response Center advisories for updates. Until a fix is available, consider applying any recommended workarounds from Microsoft if published.
HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
Description
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-43966, affects Microsoft product version 3.0. It involves HTTP response splitting due to the handling of non-VCHAR bytes in the cow_http_struct_hd:escape_string/2 function. The issue is categorized under CWE-113, indicating improper neutralization of CRLF sequences in HTTP headers, which can lead to HTTP response splitting attacks. No CVSS score or detailed vendor advisory is available, and no patch or fix has been disclosed. The vulnerability is not related to a cloud service, and no known exploits have been reported.
Potential Impact
If exploited, this vulnerability could allow an attacker to manipulate HTTP responses by injecting crafted headers or content, potentially leading to web cache poisoning, cross-site scripting, or other HTTP header injection attacks. However, no known exploits are currently reported, and the exact impact depends on the context of use in the affected software.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch information is provided, users should monitor Microsoft Security Response Center advisories for updates. Until a fix is available, consider applying any recommended workarounds from Microsoft if published.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-43966
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a35932bf198dc38c10621a0
Added to database: 6/19/2026, 7:06:19 PM
Last enriched: 6/19/2026, 7:19:24 PM
Last updated: 6/20/2026, 4:57:53 AM
Views: 3
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