CVE-2023-4806
No exploitation reported by the sources we read.
- Published2023-09-18
- WeaknessCWE-416
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.
Timeline
dates in UTC- 2023-09-1817:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4806?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4806?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 37.x | = 37 | no fix published | NVD |
| 38.x | = 38 | no fix published | NVD |
| 39.x | = 39 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | = 7.0 | no fix published | NVD |
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.8 | = 8.8 | no fix published | NVD |
| 9.2 | = 9.2 | no fix published | NVD |
19 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- glibcAlmaLinux:9all versions · fixed in 2.34-60.el9_2.7and 214 other packages
- glibcAlmaLinux:8all versions · fixed in 2.28-225.el8_8.6and 213 other packages
Fix
No fix published by the sources we read yet. NVD record
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-09-18
- Last Modified
- 2026-07-14
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-4806?
Is CVE-2023-4806 actively exploited?
What is the CVSS score for CVE-2023-4806?
Running glibc? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.