Description
A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | nettle | nettle 3.7.3 | — |
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 | nettle | 3.7.3-1 | — |
| Debian 13 | nettle | 3.7.3-1 | — |
| Debian 12 | nettle | 3.7.3-1 | — |
| Debian 10 | nettle | 3.4.1-1+deb10u1 | DSA-4933-1 |
| Debian 9 | nettle | 3.3-1+deb9u1 | DLA-2760-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nettle | 3.5.1+really3.5.1-2ubuntu0.2 | USN-4990-1 |
| Ubuntu 18.04 LTS | nettle | 3.4.1-0ubuntu0.18.04.1 | USN-4990-1 |
| Ubuntu 16.04 LTS | nettle | No fix yet | — |
| Ubuntu 14.04 LTS | nettle | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | gnutls +4 | 3.6.16-4.el8 | RHSA-2021:4451 |
| RHEL 8 | nettle +1 | 3.4.1-7.el8 | RHSA-2021:4451 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | gnutls +4 | 3.6.16-4.el8 | ALSA-2021:4451 |
| AlmaLinux 8 | nettle +1 | 3.4.1-7.el8 | ALSA-2021:4451 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | gnutls | 3.6.16-4.el8 | RLSA-2021:4451 |
| Rocky Linux 8 | nettle | 3.4.1-7.el8 | RLSA-2021:4451 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES 15 SP2 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES 15 SP1 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES 15 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES 12 SP5 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLES 12 SP3 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLES 12 SP2 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLES for SAP 15 SP1 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES for SAP 15 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLES for SAP 12 SP5 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLES for SAP 12 SP4 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLES for SAP 12 SP3 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SLE Micro 5.0 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLE HPC 15 SP1 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SLE HPC 15 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SUSE OpenStack Cloud Crowbar 9 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SUSE OpenStack Cloud Crowbar 8 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SUSE OpenStack Cloud 9 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SUSE OpenStack Cloud 8 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SUSE Manager Server 4.0 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SUSE Manager Retail Branch Server 4.0 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SUSE Manager Proxy 4.0 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
| SUSE HPE Helion OpenStack 8 | libnettle | 2.7.1-13.6.1 | SUSE-SU-2021:2135-1 |
| SUSE Enterprise Storage 6 | libnettle | 3.4.1-4.18.1 | SUSE-SU-2021:2143-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libnettle | 3.4.1-4.18.1 | openSUSE-SU-2021:2143-1 |
| openSUSE Leap 15.2 | libnettle | 3.4.1-lp152.4.6.1 | openSUSE-SU-2021:0906-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nettle | 3.7.3-r0 | — |
| Alpine v3.23 | nettle | 3.7.3-r0 | — |
| Alpine v3.22 | nettle | 3.7.3-r0 | — |
| Alpine v3.21 | nettle | 3.7.3-r0 | — |
| Alpine v3.20 | nettle | 3.7.3-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nettle | 3.7.3-r0 | — |
| Alpine v3.18 | nettle | 3.7.3-r0 | — |
| Alpine v3.17 | nettle | 3.7.3-r0 | — |
| Alpine v3.16 | nettle | 3.7.3-r0 | — |
| Alpine v3.15 | nettle | 3.7.3-r0 | — |
| Alpine v3.14 | nettle | 3.7.3-r0 | — |
| Alpine v3.13 | nettle | 3.7.3-r0 | — |
| Alpine v3.12 | nettle | 3.5.1-r2 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | nettle | 3.7.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | gnutls +4 | 3.6.16-4.el8 | ELSA-2022-9221, ELSA-2021-4451 |
| Oracle Linux 8 | nettle +1 | 3.4.1-7.el8 | ELSA-2021-4451 |
Advisories 15
- ALSA-2021:4451 Moderate: gnutls and nettle security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4451 Red Hat Security Advisory: gnutls and nettle security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 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
- USN-4990-1 nettle vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4933-1 nettle - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2760-1 nettle - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4451 Moderate: gnutls and nettle security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2021:2135-1 Security update for libnettle SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2143-1 Security update for libnettle SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2143-1 Security update for libnettle SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0906-1 Security update for libnettle SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- VDE-2022-010 PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release CERT@VDE · May 22, 2025
- ELSA-2022-9221 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 17, 2022
- ELSA-2021-4451 Moderate: gnutls and nettle security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021