Description
Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The GNU C Library | glibc | 2.7 | — |
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 | 2.42-17 | — |
| Debian 13 | glibc | 2.41-12+deb13u4 | — |
| 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 | 2.39-126.el10_2 | RHSA-2026:33092 |
| RHEL 9 | nscd +214 | 2.34-272.el9_8 | RHSA-2026:33226 |
| RHEL 8 | nscd +213 | 2.28-251.el8_10.38 | RHSA-2026:33126 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | glibc +220 | 2.39-46.el10_0.5 | RHSA-2026:33170 |
| RHEL 9.6 EUS | nscd +214 | 2.34-168.el9_6.25 | RHSA-2026:33230 |
| RHEL 9.4 E4S | nscd +209 | 2.34-100.el9_4.13 | RHSA-2026:33229 |
| RHEL 9.2 E4S | nscd +209 | 2.34-60.el9_2.20 | RHSA-2026:33231 |
| RHEL 8.8 TUS | glibc +150 | 2.28-225.el8_8.17 | RHSA-2026:33228 |
| RHEL 8.8 E4S | nscd +209 | 2.28-225.el8_8.17 | RHSA-2026:33228 |
| RHEL 8.6 EUS Long Life | glibc +154 | 2.28-189.13.el8_6 | RHSA-2026:33227 |
| RHEL 8.6 AUS | nscd +209 | 2.28-189.13.el8_6 | RHSA-2026:33227 |
| RHEL 8.4 EUS Long Life | glibc +184 | 2.28-151.el8_4.6 | RHSA-2026:36643 |
| RHEL 8.4 AUS | nscd +208 | 2.28-151.el8_4.6 | RHSA-2026:36643 |
| RHEL 7 ELS | compat-glibc +1 | 1:2.12-4.el7_9.1 | RHSA-2026:37396 |
| RHEL 7 ELS | nscd +7 | 2.17-326.el7_9.6 | RHSA-2026:34211 |
| RHEL 6 ELS | nscd +7 | 2.12-1.212.el6_10.4 | RHSA-2026:37395 |
| 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 | 2.39-126.el10_2.alma.1 | ALSA-2026:33092 |
| AlmaLinux 9 | nscd +214 | 2.34-272.el9_8 | ALSA-2026:33226 |
| AlmaLinux 8 | nscd +213 | 2.28-251.el8_10.38 | ALSA-2026:33126 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | glibc | 2.39-126.el10_2 | RLSA-2026:33092 |
| Rocky Linux 9 | glibc | 2.34-272.el9_8 | RLSA-2026:33226 |
| Rocky Linux 8 | glibc | 2.28-251.el8_10.38 | RLSA-2026:33126 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLES 15 SP4 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLES 12 SP5 | glibc | 2.22-114.46.1 | SUSE-SU-2026:2440-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLES for SAP 15 SP4 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLE Micro 6.2 | glibc | 2.40-160000.5.1 | SUSE-SU-2026:21780-1 |
| SLE Micro 5.5 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLE Micro 5.4 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLE Micro 5.3 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLE HPC 15 SP5 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
| SLE HPC 15 SP4 | glibc | 2.31-150300.101.1 | SUSE-SU-2026:2333-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.43-3.1 | openSUSE-SU-2026:10770-1 |
| openSUSE Tumbleweed | grype-db | 0.54.4-1.1 | openSUSE-SU-2026:12059-1 |
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 | 2.39-126.0.1.el10_2 | ELSA-2026-33092 |
| Oracle Linux 9 | nscd +214 | 2.34-272.0.1.el9_8 | ELSA-2026-33226 |
| Oracle Linux 8 | nscd +213 | 2.28-251.0.4.el8_10.38 | ELSA-2026-33126 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | sln +51 | 2.43-r7 | — |
Advisories 37
- WID-SEC-2026-4090 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:33226 Moderate: glibc security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:33092 Moderate: glibc security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:33126 Moderate: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2919 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- NCSC-2026-0444 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Oct 21, 2026
- WID-SEC-2026-3623 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- WID-SEC-2026-1190 GNU libc: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 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
- NCSC-2026-0431 Kwetsbaarheden verholpen in IBM DataPower Gateway en onderliggende componenten NCSC-NL (Netherlands) · Oct 16, 2026
- RHSA-2026:37396 Red Hat Security Advisory: compat-glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:37395 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36643 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:34211 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33231 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33230 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33229 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33228 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33227 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33226 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33170 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33126 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:33092 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 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
- openSUSE-SU-2026:12059-1 grype-db-0.54.4-1.1 on GA media SUSE / openSUSE Security Updates · Oct 6, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- USN-8611-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Jul 27, 2026
- ELSA-2026-33092 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- ELSA-2026-33126 Moderate: glibc security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 14, 2026
- SUSE-SU-2026:21780-1 Security update for glibc SUSE / openSUSE Security Updates · Jul 9, 2026
- RLSA-2026:33092 Moderate: glibc security, bug fix, and enhancement update Rocky Linux Security Advisories · Jul 5, 2026
- RLSA-2026:33226 Moderate: glibc security, bug fix, and enhancement update Rocky Linux Security Advisories · Jul 1, 2026
- RLSA-2026:33126 Moderate: glibc security update Rocky Linux Security Advisories · Jul 1, 2026
- ELSA-2026-33226 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 30, 2026
- SUSE-SU-2026:2440-1 Security update for glibc SUSE / openSUSE Security Updates · Jun 19, 2026
- SUSE-SU-2026:2333-1 Security update for glibc SUSE / openSUSE Security Updates · Jun 11, 2026
- openSUSE-SU-2026:10770-1 glibc-2.43-3.1 on GA media SUSE / openSUSE Security Updates · May 14, 2026