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Vulnerabilities

Vulnerability · CVE-2018-19591

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed

Published Dec 4, 2018 · catalog updated Oct 15, 2026 · In the GNU C

Check if you run it

No confirmed exploitation is on record for CVE-2018-19591. EPSS is 5.53%. Act only if a listed version of In the GNU C is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In the GNU C).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
5.53%
Remediation
Advisory link
Affected products
Debian:12 glibc · Debian:13 glibc · Debian:14 glibc · cpe fedoraproject/fedora · cpe gnu/glibc

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

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.

  • Debian:12 glibc0 → 2.28-1
  • Debian:13 glibc0 → 2.28-1
  • Debian:14 glibc0 → 2.28-1
  • cpe fedoraproject/fedora28
  • cpe fedoraproject/fedora29
  • cpe gnu/glibcversion unspecified

How to fix CVE-2018-19591

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2018-19591. EPSS is 5.53%. Act only if a listed version of In the GNU C is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.28-1, 28, 29. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation; CWE-404. EPSS 5.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

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. Dec 4, 2018 · NIST NVD

    Detected

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  2. Oct 14, 2026 · NIST NVD

    Updated

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  3. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    glibc fixed in 2.28-1; glibc fixed in 2.28-1; glibc fixed in 2.28-1

  4. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    glibc fixed in 2.28-1

  5. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  6. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  7. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  8. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

Sources

  • CVE.orgVulnerability recordCVE-2018-19591

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-19591

    30-day exploitation probability 5.5%

    first.org
  • NIST NVDVulnerability recordCVE-2018-19591

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2018-19591
    osv.dev

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.