01 Record
CVE-2026-4438
gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames
MediumPUBLISHEDCNA: glibc
CNA base score5.4 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
02 Description
gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.33% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 26.1% of scored records. A rank, not a probability.
- NVD base score
- 5.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-07-14.
- Red Hat severity
- Low. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-03-20 19:59Z7 MO AGO
- Last updated
- 2026-10-15 01:12Z14 DAYS AGO
- Reserved
- 2026-03-19
- Assigning CNA
- glibc
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.4)
- CNA CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- Data version
- 5.2
- Document digest
- bac8b74f1655acf210e55b134aa8dffe3bddf10cd25a7cc407fa0e47436c02fa
05 Affected products
VendorProductVersionsPlatforms
06 References
- sourceware.orghttps://sourceware.org/bugzilla/show_bug.cgi?id=34015
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
07 Fixed in
AlmaLinux 9
- glibc Fixed in 2.34-270.el9_8
- glibc-all-langpacks Fixed in 2.34-270.el9_8
- glibc-benchtests Fixed in 2.34-270.el9_8
- glibc-common Fixed in 2.34-270.el9_8
- glibc-devel Fixed in 2.34-270.el9_8
- glibc-doc Fixed in 2.34-270.el9_8
- glibc-gconv-extra Fixed in 2.34-270.el9_8
- glibc-headers Fixed in 2.34-270.el9_8
- glibc-langpack-aa Fixed in 2.34-270.el9_8
- glibc-langpack-af Fixed in 2.34-270.el9_8
- glibc-langpack-agr Fixed in 2.34-270.el9_8
- glibc-langpack-ak Fixed in 2.34-270.el9_8
- glibc-langpack-am Fixed in 2.34-270.el9_8
- glibc-langpack-an Fixed in 2.34-270.el9_8
- glibc-langpack-anp Fixed in 2.34-270.el9_8
- glibc-langpack-ar Fixed in 2.34-270.el9_8
- glibc-langpack-as Fixed in 2.34-270.el9_8
- glibc-langpack-ast Fixed in 2.34-270.el9_8
- glibc-langpack-ayc Fixed in 2.34-270.el9_8
- glibc-langpack-az Fixed in 2.34-270.el9_8
- glibc-langpack-be Fixed in 2.34-270.el9_8
- glibc-langpack-bem Fixed in 2.34-270.el9_8
- glibc-langpack-ber Fixed in 2.34-270.el9_8
- glibc-langpack-bg Fixed in 2.34-270.el9_8
- glibc-langpack-bhb Fixed in 2.34-270.el9_8
- glibc-langpack-bho Fixed in 2.34-270.el9_8
- glibc-langpack-bi Fixed in 2.34-270.el9_8
- glibc-langpack-bn Fixed in 2.34-270.el9_8
- glibc-langpack-bo Fixed in 2.34-270.el9_8
- glibc-langpack-br Fixed in 2.34-270.el9_8
- glibc-langpack-brx Fixed in 2.34-270.el9_8
- glibc-langpack-bs Fixed in 2.34-270.el9_8
- glibc-langpack-byn Fixed in 2.34-270.el9_8
- glibc-langpack-ca Fixed in 2.34-270.el9_8
- glibc-langpack-ce Fixed in 2.34-270.el9_8
- glibc-langpack-chr Fixed in 2.34-270.el9_8
- glibc-langpack-ckb Fixed in 2.34-270.el9_8
- glibc-langpack-cmn Fixed in 2.34-270.el9_8
- glibc-langpack-crh Fixed in 2.34-270.el9_8
- glibc-langpack-cs Fixed in 2.34-270.el9_8
175 further packages in AlmaLinux 9 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- glibc Fixed in 2.39-121.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-121.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-121.el10_2.alma.1
- glibc-common Fixed in 2.39-121.el10_2.alma.1
- glibc-devel Fixed in 2.39-121.el10_2.alma.1
- glibc-doc Fixed in 2.39-121.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-121.el10_2.alma.1
181 further packages in AlmaLinux 10 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- glibc Fixed in 2.34-270.el9_8
- glibc-all-langpacks Fixed in 2.34-270.el9_8
- glibc-benchtests Fixed in 2.34-270.el9_8
- glibc-common Fixed in 2.34-270.el9_8
- glibc-devel Fixed in 2.34-270.el9_8
- glibc-doc Fixed in 2.34-270.el9_8
- glibc-gconv-extra Fixed in 2.34-270.el9_8
- glibc-headers Fixed in 2.34-270.el9_8
- glibc-langpack-aa Fixed in 2.34-270.el9_8
- glibc-langpack-af Fixed in 2.34-270.el9_8
- glibc-langpack-agr Fixed in 2.34-270.el9_8
- glibc-langpack-ak Fixed in 2.34-270.el9_8
- glibc-langpack-am Fixed in 2.34-270.el9_8
- glibc-langpack-an Fixed in 2.34-270.el9_8
- glibc-langpack-anp Fixed in 2.34-270.el9_8
- glibc-langpack-ar Fixed in 2.34-270.el9_8
- glibc-langpack-as Fixed in 2.34-270.el9_8
- glibc-langpack-ast Fixed in 2.34-270.el9_8
- glibc-langpack-ayc Fixed in 2.34-270.el9_8
- glibc-langpack-az Fixed in 2.34-270.el9_8
- glibc-langpack-be Fixed in 2.34-270.el9_8
- glibc-langpack-bem Fixed in 2.34-270.el9_8
- glibc-langpack-ber Fixed in 2.34-270.el9_8
- glibc-langpack-bg Fixed in 2.34-270.el9_8
- glibc-langpack-bhb Fixed in 2.34-270.el9_8
- glibc-langpack-bho Fixed in 2.34-270.el9_8
- glibc-langpack-bi Fixed in 2.34-270.el9_8
- glibc-langpack-bn Fixed in 2.34-270.el9_8
- glibc-langpack-bo Fixed in 2.34-270.el9_8
- glibc-langpack-br Fixed in 2.34-270.el9_8
- glibc-langpack-brx Fixed in 2.34-270.el9_8
- glibc-langpack-bs Fixed in 2.34-270.el9_8
- glibc-langpack-byn Fixed in 2.34-270.el9_8
- glibc-langpack-ca Fixed in 2.34-270.el9_8
- glibc-langpack-ce Fixed in 2.34-270.el9_8
- glibc-langpack-chr Fixed in 2.34-270.el9_8
- glibc-langpack-ckb Fixed in 2.34-270.el9_8
- glibc-langpack-cmn Fixed in 2.34-270.el9_8
- glibc-langpack-crh Fixed in 2.34-270.el9_8
- glibc-langpack-cs Fixed in 2.34-270.el9_8
175 further packages in CloudLinux 9 not shown (first 40 listed).
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- glibc Fixed in 2.39-121.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-121.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-121.el10_2.alma.1
- glibc-common Fixed in 2.39-121.el10_2.alma.1
- glibc-devel Fixed in 2.39-121.el10_2.alma.1
- glibc-doc Fixed in 2.39-121.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-121.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-121.el10_2.alma.1
181 further packages in CloudLinux 10 not shown (first 40 listed).
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- glibc Fixed in 2.36-9+deb12u14
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- glibc Fixed in 2.41-12+deb13u3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- glibc Fixed in 2.42-14
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- glibc Fixed in 2.39-0ubuntu8.8
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- eglibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.