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Vulnerabilities

Vulnerability · CVE-2018-1000001

GNU GNU C Library (glibc) Out-of-bounds Write

Published Jan 26, 2022 · catalog updated Jan 26, 2022 · GNU GNU C Library (glibc)

Patch now

CVE-2018-1000001 is in the CISA known-exploited catalog. Confirm GNU GNU C Library (glibc) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
13.37%
Remediation
Remediation guidance
Affected products
stated GNU C Library (glibc) · vendor GNU GNU C Library (glibc)

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated GNU C Library (glibc)<= 2.26
  • vendor GNU GNU C Library (glibc)version unspecified

How to fix CVE-2018-1000001

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2018-1000001 is in the CISA known-exploited catalog. Confirm GNU GNU C Library (glibc) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with GNU C Library (glibc) <= 2.26. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 13.37%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 26, 2022 · VulnCheck KEV

    Detected

    In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

  2. Jan 26, 2022 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2018-1000001

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-1000001

    30-day exploitation probability 13.4%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2018-1000001

    In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.