CVE-2026-5450— scanf %mc off-by-one heap buffer overflow
Quick assessment
Affected
The GNU C Library glibc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GNU C Library是GNU社区的一种按照LGPL许可协议发布的开源免费的C语言编译程序。 GNU C Library 2.7至2.43版本存在安全漏洞，该漏洞源于使用%mc和宽度大于1024的格式说明符调用scanf系列函数，可能导致单字节堆缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| The GNU C Library | glibc | 2.7< * |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-5450
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
scanf %mc off-by-one heap buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
GNU C Library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU C Library是GNU社区的一种按照LGPL许可协议发布的开源免费的C语言编译程序。 GNU C Library 2.7至2.43版本存在安全漏洞，该漏洞源于使用%mc和宽度大于1024的格式说明符调用scanf系列函数，可能导致单字节堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| The GNU C Library | glibc | 2.7 ~ * | - |
|
II. Public POCs for CVE-2026-5450
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-5450
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same product: glibc
-
CVE-2026-97399
One-byte overread in strncasecmp on Power8 -
CVE-2026-95818
AT_SECURE program buffer overflow via $ORIGIN processing -
CVE-2026-86805
AT_SECURE programs may load attacker-controlled code via $OR -
CVE-2026-8674
Assertion failure in the DNS stub resolver with a long searc -
CVE-2026-80489
EUC_JISX0213 decoding may hang on crafted input
Same vendor: The GNU C Library
-
CVE-2026-97399
One-byte overread in strncasecmp on Power8 -
CVE-2026-95818
AT_SECURE program buffer overflow via $ORIGIN processing -
CVE-2026-86805
AT_SECURE programs may load attacker-controlled code via $OR -
CVE-2026-8674
Assertion failure in the DNS stub resolver with a long searc -
CVE-2026-80489
EUC_JISX0213 decoding may hang on crafted input
Same weakness: CWE-122
-
CVE-2026-103631
Chrome <154.0.8037.97 WebRTC堆溢出漏洞 -
CVE-2026-91135
Apache Thrift: C++ `THeaderTransport::transform()` heap buff -
CVE-2026-14316
Heap buffer overflow in boks_sshd revoked-key error handling -
CVE-2026-101283
iperf3 3.20-3.21 RSA解密堆溢出漏洞 -
CVE-2026-103242
Rpm: heap-based buffer overflow write in hex2binv() via a mi
V. Comments for CVE-2026-5450
No comments yet