Description
The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory.
These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The GNU C Library | glibc | 2.0.1 – ≤ 2.43 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glibc | 2.43-3 | — |
| Debian 13 | glibc | No fix yet | — |
| Debian 12 | glibc | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | glibc | 2.43-2ubuntu2.3 | USN-8611-1 |
| Ubuntu 25.10 | glibc | No fix yet | — |
| Ubuntu 24.04 LTS | glibc | 2.39-0ubuntu8.8 | USN-8611-1 |
| Ubuntu 22.04 LTS | glibc | 2.35-0ubuntu3.14 | USN-8611-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 18.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 16.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 14.04 LTS | eglibc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | glibc +220 | 2.39-128.el10_2 | RHSA-2026:42694 |
| RHEL 9 | nscd +214 | 2.34-274.el9_8 | RHSA-2026:42952 |
| RHEL 8 | nscd +213 | 2.28-251.el8_10.40 | RHSA-2026:42733 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | glibc +223 | 2.42-12.hum1 | RHSA-2026:12740 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | glibc +220 | 2.39-128.el10_2.alma.1 | ALSA-2026:42694 |
| AlmaLinux 9 | nscd +214 | 2.34-274.el9_8 | ALSA-2026:42952 |
| AlmaLinux 8 | nscd +213 | 2.28-251.el8_10.40 | ALSA-2026:42733 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | glibc | 2.39-128.el10_2 | RLSA-2026:42694 |
| Rocky Linux 9 | glibc | 2.34-274.el9_8 | RLSA-2026:42952 |
| Rocky Linux 8 | glibc | 2.28-251.el8_10.40 | RLSA-2026:42733 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | glibc | 2.38-150600.14.52.1 | SUSE-SU-2026:3030-1 |
| SLES 15 SP6 | glibc | 2.38-150600.14.52.1 | SUSE-SU-2026:3030-1 |
| SLES 15 SP5 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLES 15 SP4 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLES 12 SP5 | glibc | 2.22-114.49.1 | SUSE-SU-2026:2987-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | glibc | 2.38-150600.14.52.1 | SUSE-SU-2026:3030-1 |
| SLES for SAP 15 SP5 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLES for SAP 15 SP4 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLE Micro 6.2 | glibc | 2.40-160000.6.1 | SUSE-SU-2026:22538-1 |
| SLE Micro 6.1 | glibc | 2.38-slfo.1.1_9.1 | SUSE-SU-2026:22453-1 |
| SLE Micro 6.0 | glibc | 2.38-14.1 | SUSE-SU-2026:22523-1 |
| SLE Micro 5.5 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLE Micro 5.4 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLE Micro 5.3 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLE HPC 15 SP5 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
| SLE HPC 15 SP4 | glibc | 2.31-150300.104.1 | SUSE-SU-2026:3029-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.43-4.1 | openSUSE-SU-2026:11140-1 |
| openSUSE Leap 16.0 | glibc +4 | 2.40-160000.6.1 | openSUSE-SU-2026:21228-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | glibc | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | glibc +220 | 2.39-128.0.1.el10_2 | ELSA-2026-42694 |
| Oracle Linux 9 | nscd +214 | 2.34-274.0.1.el9_8 | ELSA-2026-42952 |
| Oracle Linux 8 | nscd +213 | 2.28-251.0.4.el8_10.40 | ELSA-2026-42733 |
Advisories 25
- WID-SEC-2026-1300 GNU libc: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- ALSA-2026:42952 Moderate: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:42694 Moderate: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:42733 Moderate: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:42952 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:42733 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:42694 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:12740 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- ELSA-2026-42694 Moderate: glibc security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 7, 2026
- USN-8611-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Jul 27, 2026
- RLSA-2026:42952 Moderate: glibc security update Rocky Linux Security Advisories · Jul 23, 2026
- ELSA-2026-42733 Moderate: glibc security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 23, 2026
- RLSA-2026:42694 Moderate: glibc security update Rocky Linux Security Advisories · Jul 22, 2026
- RLSA-2026:42733 Moderate: glibc security update Rocky Linux Security Advisories · Jul 22, 2026
- ELSA-2026-42952 Moderate: glibc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 22, 2026
- SUSE-SU-2026:3030-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 16, 2026
- SUSE-SU-2026:3029-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 16, 2026
- SUSE-SU-2026:2987-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 15, 2026
- SUSE-SU-2026:22538-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 14, 2026
- SUSE-SU-2026:22523-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 9, 2026
- openSUSE-SU-2026:21228-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 5, 2026
- SUSE-SU-2026:22453-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 4, 2026
- openSUSE-SU-2026:11140-1 glibc-2.43-4.1 on GA media SUSE / openSUSE Security Updates · Jun 29, 2026