Description
The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite loop when processing invalid multi-byte input sequences, leading to a denial of service.
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 | 2.31-3 | — |
| Debian 13 | glibc | 2.31-3 | — |
| Debian 12 | glibc | 2.31-3 | — |
| Debian 10 | glibc | 2.28-10+deb10u2 | DLA-3152-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | glibc | 2.31-0ubuntu9.7 | USN-5310-1 |
| Ubuntu 18.04 LTS | glibc | 2.27-3ubuntu1.5 | USN-5310-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | glibc | 2.23-0ubuntu11.3+esm3 | USN-5768-1 |
| Ubuntu Pro 14.04 LTS | eglibc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nscd +212 | 2.28-151.el8 | RHSA-2021:1585 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | nss_hesiod +3 | 2.28-151.el8 | ALSA-2021:1585 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | glibc | 2.28-151.el8 | RLSA-2021:1585 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | glibc | 2.26-13.62.1 | SUSE-SU-2021:3830-1 |
| SLES 12 SP5 | glibc | 2.22-114.12.1 | SUSE-SU-2021:2480-1 |
| SLES 12 SP3 | glibc | 2.22-126.1 | SUSE-SU-2022:2886-1 |
| SLES 12 SP2 | glibc | 2.22-126.1 | SUSE-SU-2022:2886-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | glibc | 2.22-114.12.1 | SUSE-SU-2021:2480-1 |
| SLE Micro 5.0 | glibc | 2.26-13.62.1 | SUSE-SU-2021:3830-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.34-1.2 | openSUSE-SU-2024:10792-1 |
| openSUSE Leap 15.2 | glibc +1 | 2.26-lp152.26.12.1 | openSUSE-SU-2021:1560-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nscd +199 | 2.26-41.amzn2 | ALAS2-2021-1605 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nscd +211 | 2.28-151.0.1.el8 | ELSA-2021-1585 |
Advisories 19
- ALSA-2021:1585 Moderate: glibc security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:1585 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- USN-5768-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5310-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3152-1 glibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1585 Moderate: glibc security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:10792-1 glibc-2.34-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1560-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3830-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2886-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- SUSE-SU-2021:2480-1 Security update for glibc SUSE / openSUSE Security Updates · May 2, 2025
- SSA-831302 SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0 Siemens ProductCERT · Apr 9, 2024
- ICSA-23-166-10 Siemens SIMATIC S7-1500 TM MFP BIOS CISA ICS & IT advisories · Apr 9, 2024
- WID-SEC-2023-1432 Siemens SIMATIC S7: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 22, 2023
- ELSA-2021-1585 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
- ALAS2-2021-1605 Important: glibc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 19, 2021
References
- 96525 vdb-entry
- GLSA-202101-20 vendor-advisory
- [mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar mailing-list
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://sourceware.org/bugzilla/show_bug.cgi?id=19519
- http://openwall.com/lists/oss-security/2017/03/01/10
- https://sourceware.org/bugzilla/show_bug.cgi?id=19519#c21
- https://sourceware.org/bugzilla/show_bug.cgi?id=26224
- [debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update mailing-list