All vulnerabilities

Servers and applications

CVE-2017-17426

The malloc function in the GNU C Library (aka glibc or libc6) 2.26 could return a memory block that is too small if an attempt is made to allocate an object whose size is close to SIZE_MAX, potentially leading to a subsequent heap overflow. This occurs because the per-thread cache (aka tcache) feature enables a code path that lacks an integer overflow check.

Severity
High 8.1
Published
5 Dec 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.6% in the next 30 daysHigher than 76% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Integer overflow (CWE-190)
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
GNU C LibraryServers and applications · cpe:a:gnu:glibc
  • Version 2.26

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-17426
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-17426