CVE-2026-12549: Buffer Access with Incorrect Length Value in Red Hat Red Hat Enterprise Linux 10
The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.
AI Analysis
Technical Summary
This vulnerability is a regression of the fix for CVE-2026-2443 in Red Hat Enterprise Linux 10. A subsequent code rework replaced specific overflow checks with a general signed comparison, which fails to properly clamp a negative start value when a client sends a Range request with a suffix length larger than the content size. This causes malformed HTTP 206 Partial Content responses and excessive logging (log flooding). The CVSS 3.1 base score is 4.8 (medium severity), reflecting network attack vector, high attack complexity, no privileges required, no user interaction, unchanged scope, limited confidentiality impact, no integrity impact, and low availability impact.
Potential Impact
The vulnerability causes malformed HTTP 206 responses and log flooding, which may degrade service availability or performance. There is limited confidentiality impact and no integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-12549 for current remediation guidance. No official fix or temporary workaround is explicitly stated in the provided data. Users should monitor the vendor advisory for updates and apply patches once available.
CVE-2026-12549: Buffer Access with Incorrect Length Value in Red Hat Red Hat Enterprise Linux 10
Description
The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.
CVSS v3.1
Score 4.8medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a regression of the fix for CVE-2026-2443 in Red Hat Enterprise Linux 10. A subsequent code rework replaced specific overflow checks with a general signed comparison, which fails to properly clamp a negative start value when a client sends a Range request with a suffix length larger than the content size. This causes malformed HTTP 206 Partial Content responses and excessive logging (log flooding). The CVSS 3.1 base score is 4.8 (medium severity), reflecting network attack vector, high attack complexity, no privileges required, no user interaction, unchanged scope, limited confidentiality impact, no integrity impact, and low availability impact.
Potential Impact
The vulnerability causes malformed HTTP 206 responses and log flooding, which may degrade service availability or performance. There is limited confidentiality impact and no integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-12549 for current remediation guidance. No official fix or temporary workaround is explicitly stated in the provided data. Users should monitor the vendor advisory for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-17T18:40:22.117Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-12549","vendor":"Red Hat"},{"url":"https://access.redhat.com/security/cve/cve-2026-0716","vendor":"Red Hat"}]
Threat ID: 6a395729eed863c81e0537d9
Added to database: 06/22/2026, 15:39:21 UTC
Last enriched: 06/29/2026, 21:53:33 UTC
Last updated: 08/06/2026, 00:41:10 UTC
Views: 61
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