CVE-2026-5450: CWE-122 Heap-based buffer overflow in The GNU C Library glibc
CVE-2026-5450 is a heap-based buffer overflow vulnerability in the GNU C Library (glibc) affecting versions 2. 7 through 2. 43. It occurs when the scanf family of functions is called with the %mc format specifier combined with an explicit width greater than 1024, potentially causing a one-byte overflow on the heap. No official patch or remediation guidance has been provided yet. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
This vulnerability involves a heap-based buffer overflow triggered by using the %mc format specifier in scanf functions with a width specifier greater than 1024 in glibc versions 2.7 to 2.43. The overflow is limited to one byte but occurs on the heap, which may lead to memory corruption. The issue is identified as CWE-122. No CVSS score or vendor advisory with patch information is currently available.
Potential Impact
The vulnerability can cause a one-byte heap buffer overflow, which may lead to memory corruption. The exact impact depends on how the affected functions are used in applications, but such overflows can potentially be leveraged for denial of service or code execution. No known exploits have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid using the %mc format specifier with explicit width specifiers greater than 1024 in scanf calls.
CVE-2026-5450: CWE-122 Heap-based buffer overflow in The GNU C Library glibc
Description
CVE-2026-5450 is a heap-based buffer overflow vulnerability in the GNU C Library (glibc) affecting versions 2. 7 through 2. 43. It occurs when the scanf family of functions is called with the %mc format specifier combined with an explicit width greater than 1024, potentially causing a one-byte overflow on the heap. No official patch or remediation guidance has been provided yet. There are no known exploits in the wild at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow triggered by using the %mc format specifier in scanf functions with a width specifier greater than 1024 in glibc versions 2.7 to 2.43. The overflow is limited to one byte but occurs on the heap, which may lead to memory corruption. The issue is identified as CWE-122. No CVSS score or vendor advisory with patch information is currently available.
Potential Impact
The vulnerability can cause a one-byte heap buffer overflow, which may lead to memory corruption. The exact impact depends on how the affected functions are used in applications, but such overflows can potentially be leveraged for denial of service or code execution. No known exploits have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid using the %mc format specifier with explicit width specifiers greater than 1024 in scanf calls.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- glibc
- Date Reserved
- 2026-04-02T21:47:21.403Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e6941f19fe3cd2cd32c4a0
Added to database: 4/20/2026, 9:01:19 PM
Last enriched: 4/20/2026, 9:16:24 PM
Last updated: 4/20/2026, 10:05:10 PM
Views: 5
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