CVE-2023-5156: Glibc: dos due to memory leak in getaddrinfo.c
Vulnerability summary
CVE-2023-5156 is a high (CVSS 7.5) vulnerability in gnu glibc. EPSS estimates a 1.63% chance of exploitation in the next 30 days, higher than 76.1% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 4Timeline
- 25-09-2023PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
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 metrics
6 scores · 6 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.63%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
Increase +0.04 pp
From 1.58% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu2 products
- eglibcAll versions (No fix recorded)
- glibc< 2.35-0ubuntu3.5
Chainguard1 product
- glibc< 2.38-r3
Debian1 product
- glibc< 2.37-11
Gnu1 product
- glibc≥ 2.34, < 2.39
Mageia1 product
- glibc< 2.36-50.mga9
Redhat1 product
- enterprise_linux8.0 | 9.0
Wolfi1 product
- glibc< 2.38-r3
7 vendors · 8 products
References
22 links- access.redhat.com/security/cve/CVE-2023-5156VDB EntryX Refsource REDHATREPORTAdvisoryThird Party Advisory
