Description
A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | nss | nss 3.55 | — |
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 | nss | 2:3.55-1 | — |
| Debian 13 | nss | 2:3.55-1 | — |
| Debian 12 | nss | 2:3.55-1 | — |
| Debian 10 | nss | 2:3.42.1-1+deb10u6 | DLA-3327-1 |
| Debian 9 | nss | 2:3.26.2-1.1+deb9u2 | DLA-2388-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nss | 2:3.49.1-1ubuntu1.5 | USN-4476-1 |
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.12 | USN-4476-1 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.14 | USN-4476-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | nss | 2:3.28.4-0ubuntu0.14.04.5+esm8 | USN-4476-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nss +9 | 3.53.1-17.el8_3 | RHSA-2021:0538 |
| RHEL 7 | nspr +1 | 4.25.0-2.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss +4 | 3.53.1-3.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss-softokn +3 | 3.53.1-6.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss-util +1 | 3.53.1-1.el7_9 | RHSA-2020:4076 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.7 EUS | nss-softokn +3 | 3.44.0-9.el7_7 | RHSA-2021:1026 |
| RHEL 7.6 EUS | nss +4 | 3.36.0-9.el7_6 | RHSA-2021:0876 |
| RHEL 7.6 EUS | nss-softokn +3 | 3.36.0-7.el7_6 | RHSA-2021:0876 |
| RHEL 7.4 TUS | nss-softokn +3 | 3.28.3-10.el7_4 | RHSA-2021:0758 |
| RHEL 7.4 E4S | nss-softokn +3 | 3.28.3-10.el7_4 | RHSA-2021:0758 |
| RHEL 7.4 AUS | nss-softokn +3 | 3.28.3-10.el7_4 | RHSA-2021:0758 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | nss | 3.53.1-17.el8_3 | RLSA-2021:0538 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES 15 SP3 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES 15 SP2 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES 15 SP2 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES 15 SP1 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES 15 SP1 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES 15 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES 15 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES 12 SP5 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP5 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP4 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP3 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP3 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP2 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES 12 SP2 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLES 11 SP4 | mozilla-nspr | 4.32-33.6.1 | SUSE-RU-2021:14818-1 |
| SLES 11 SP4 | mozilla-nss | 3.68-47.16.1 | SUSE-RU-2021:14818-1 |
| SLES for SAP 15 SP1 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES for SAP 15 SP1 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES for SAP 15 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLES for SAP 15 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLES for SAP 12 SP5 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES for SAP 12 SP5 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLES for SAP 12 SP4 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLES for SAP 12 SP3 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SLE Micro 5.1 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-2 |
| SLE Micro 5.1 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-2 |
| SLE Micro 5.0 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLE Micro 5.0 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLE HPC 15 SP1 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLE HPC 15 SP1 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SLE HPC 15 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SLE HPC 15 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SUSE OpenStack Cloud Crowbar 9 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud Crowbar 9 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud 9 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud 9 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud 8 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SUSE OpenStack Cloud 8 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SUSE Manager Server 4.0 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SUSE Manager Server 4.0 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SUSE Manager Retail Branch Server 4.0 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SUSE Manager Retail Branch Server 4.0 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SUSE Manager Proxy 4.0 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SUSE Manager Proxy 4.0 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nspr | 4.32-33.6.1 | SUSE-RU-2021:14818-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nss | 3.68-47.16.1 | SUSE-RU-2021:14818-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nspr | 4.32-19.18.1 | SUSE-RU-2021:3116-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nss | 3.68-58.54.1 | SUSE-RU-2021:3116-1 |
| SUSE Enterprise Storage 6 | mozilla-nspr | 4.32-3.20.1 | SUSE-RU-2021:3115-1 |
| SUSE Enterprise Storage 6 | mozilla-nss | 3.68-3.56.1 | SUSE-RU-2021:3115-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mozilla-nss | 3.69.1-1.2 | openSUSE-SU-2024:11058-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nss | 3.55-r0 | — |
| Alpine v3.23 | nss | 3.55-r0 | — |
| Alpine v3.22 | nss | 3.55-r0 | — |
| Alpine v3.21 | nss | 3.55-r0 | — |
| Alpine v3.20 | nss | 3.55-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nss | 3.55-r0 | — |
| Alpine v3.18 | nss | 3.55-r0 | — |
| Alpine v3.17 | nss | 3.55-r0 | — |
| Alpine v3.16 | nss | 3.55-r0 | — |
| Alpine v3.15 | nss | 3.55-r0 | — |
| Alpine v3.14 | nss | 3.55-r0 | — |
| Alpine v3.13 | nss | 3.55-r0 | — |
| Alpine v3.12 | nss | 3.55-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nspr +1 | 4.25.0-2.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss +4 | 3.53.1-3.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss-softokn +3 | 3.53.1-6.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss-util +1 | 3.53.1-1.amzn2 | ALAS2-2020-1559 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | nss | 3.44-10 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nss +9 | 3.53.1-17.el8_3 | ELSA-2021-0538 |
| Oracle Linux 7 | nspr +1 | 4.25.0-2.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss +4 | 3.53.1-3.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss-softokn +3 | 3.53.1-6.0.1.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss-util +1 | 3.53.1-1.el7_9 | ELSA-2020-4076 |
Advisories 19
- RHSA-2021:0538 Red Hat Security Advisory: nss security and bug fix update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2020:4076 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- USN-4476-1 nss vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2021:1026 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0876 Red Hat Security Advisory: nss and nss-softokn security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0758 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- DLA-3327-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2388-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:0538 Moderate: nss security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-RU-2021:14818-1 Recommended update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11058-1 libfreebl3-3.69.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2021:3115-2 Recommended update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2021:3116-1 Recommended update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2021:3115-1 Recommended update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1831 Mozilla NSS: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jun 2, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ELSA-2021-0538 Moderate: nss security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 17, 2021
- ALAS2-2020-1559 Moderate: nspr security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 11, 2020
- ELSA-2020-4076 Moderate: nss and nspr security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 8, 2020