CVE-2023-5156

HIGHNVD 7.53.7▼

7.5

A flaw was found in the GNU C Library. A recent fix for CVE-2023-4806 introduced the potential for a memory leak, which may result in an application crash.

CVSS v3: 7.5
EG Score: 3.7(medium)
EPSS: 17.0%
KEV: Not listed

Published

September 25, 2023

Last Modified

November 21, 2024

References (13)

secalert@redhathttps://access.redhat.com/security/cve/CVE-2023-5156
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2240541
secalert@redhathttps://sourceware.org/bugzilla/show_bug.cgi?id=30884
secalert@redhathttps://sourceware.org/git/?p=glibc.git;a=commitdiff;h=ec6b95c3303c700eb89eebeda2d7264cc184a796
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/10/03/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/10/03/5
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/10/03/6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/10/03/8
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2023-5156
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2240541
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202402-01
af854a3a-2127-422b-91ae-364da2661108https://sourceware.org/bugzilla/show_bug.cgi?id=30884
af854a3a-2127-422b-91ae-364da2661108https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=ec6b95c3303c700eb89eebeda2d7264cc184a796

Vendor Advisories for CVE-2023-5156(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2023-5156
Microsoft Security Response Center (MSRC)
CVE-2023-5156

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	nscd (2.31-0ubuntu9.14) @ focal	2026-05-24	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

UbuntuUSN-6541-1MEDIUM
GNU C Library vulnerabilities

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:11 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 17:11 UTCEG score recompute
2026-05-24 17:11 UTCVendor advisory

Frequently asked(5)

What is CVE-2023-5156?

CVE-2023-5156 is a high vulnerability published on September 25, 2023. A flaw was found in the GNU C Library. A recent fix for CVE-2023-4806 introduced the potential for a memory leak, which may result in an application crash.

When was CVE-2023-5156 disclosed?

CVE-2023-5156 was first published in the National Vulnerability Database on September 25, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-5156 actively exploited?

CVE-2023-5156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-5156?

CVE-2023-5156 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 3.7.

How do I remediate CVE-2023-5156?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-5156, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-5156

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CVE-2023-5156

Published

Last Modified

References (13)

Vendor Advisories for CVE-2023-5156(1)

Patch Availability(1)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-5156?

Same vendor

Same CWE

CVE-2023-5156

📅 Published

🔄 Last Modified

🔗 References (13)

📣 Vendor Advisories for CVE-2023-5156(1)

Patch Availability(1)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-5156?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (13)

Vendor Advisories for CVE-2023-5156(1)

Frequently asked(5)

Related CVEs(same vendor + same CWE)