Vulnerabilities / CVE-2018-6551

critical

CVE-2018-6551

glibc: integer overflow in malloc functions

Published Modified CWE 190, 787
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat5.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Trivy's own label is CRITICAL. Rated critical by NVD, Photon OS. Rated lower by Red Hat (medium), Amazon (medium).

Description

The malloc implementation in the GNU C Library (aka glibc or libc6), from version 2.24 to 2.26 on powerpc, and only in version 2.26 on i386, did not properly handle malloc calls with arguments close to SIZE_MAX and could return a pointer to a heap region that is smaller than requested, eventually leading to heap corruption.

Affected packages and fixed versions

SourcePackageFixed in
Photon OS 1.0glibc2.22-19.ph1
Photon OS 2.0glibc2.26-10.ph2
amazon linux 2glibc, glibc-all-langpacks, glibc-benchtests and 198 more2.26-27.amzn2.0.4
debian 11glibc2.27-1
debian 12glibc2.27-1
debian 13glibc2.27-1
debian 14glibc2.27-1
echoglibc2.27-1
root.io debian 11rootio-glibc2.27-1
root.io debian 12rootio-glibc2.27-1
root.io debian 13rootio-glibc2.27-1
Show all 211 entries from 11 sources
SourcePackageFixed in
Photon OS 1.0glibc2.22-19.ph1
Photon OS 2.0glibc2.26-10.ph2
amazon linux 2glibc2.26-27.amzn2.0.4
amazon linux 2glibc-all-langpacks2.26-27.amzn2.0.4
amazon linux 2glibc-benchtests2.26-27.amzn2.0.4
amazon linux 2glibc-common2.26-27.amzn2.0.4
amazon linux 2glibc-debuginfo2.26-27.amzn2.0.4
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debian 11glibc2.27-1
debian 12glibc2.27-1
debian 13glibc2.27-1
debian 14glibc2.27-1
echoglibc2.27-1
root.io debian 11rootio-glibc2.27-1
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References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.