Description
Issue summary: Receiving a QUIC initial packet with an invalid token may
trigger a NULL pointer dereference in the OpenSSL QUIC server with
address validation disabled.
Impact summary: NULL pointer dereference typically causes abnormal termination
of the affected QUIC server process and a Denial of Service.
If the address validation is disabled in the OpenSSL QUIC server
implementation, an attacker can crash the server by sending an initial
packet with an invalid or expired token.
By default, the client address validation is enabled in the OpenSSL QUIC server
implementation, which makes the default configuration not vulnerable
to this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with
the SSL_new_listener() call, the address validation is disabled making the
vulnerable code reachable.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
issue, as the affected code is outside the OpenSSL FIPS module boundary.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 4.0.0 – < 4.0.1, 3.6.0 – < 3.6.3, 3.5.0 – < 3.5.7 | 4.0.1 |
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 | openssl | 3.6.3-1 | — |
| Debian 13 | openssl | 3.5.6-1~deb13u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssl | 3.5.5-1ubuntu3.2 | — |
| Ubuntu 25.10 | openssl | 3.5.3-1ubuntu3.4 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssl +3 | 1:3.5.5-4.el10_2 | RHSA-2026:25237 |
| RHEL 9 | openssl +3 | 1:3.5.5-4.el9_8 | RHSA-2026:25239 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | bootupd +1 | 0.3.2-1.hum1 | RHSA-2026:67551 |
| Red Hat Hardened Images 1 | chunkah | 0.6.0-3.hum1 | RHSA-2026:42825 |
| Red Hat Hardened Images 1 | openssl +10 | 3.5.8-0.1.hum1 | RHSA-2026:59641, RHSA-2026:59635 |
| Red Hat Hardened Images 1 | python-cryptography +1 | 50.0.0-1.hum1 | RHSA-2026:55543 |
| Red Hat Hardened Images 1 | ruby3.3 +5 | 3.3.10-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | ruby3.4 +5 | 3.4.10-31.7.hum1 | RHSA-2026:62790 |
| Red Hat Hardened Images 1 | ruby4.0 +5 | 4.0.6-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem3.3-bigdecimal | 3.1.5-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-bundler | 2.5.22-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-devel +1 | 3.5.22-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-io-console | 0.7.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-irb | 1.13.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-json | 2.7.2-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-minitest | 5.20.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-power_assert | 2.0.3-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-psych | 5.1.2-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-racc | 1.7.3-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rake | 13.1.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rbs | 3.4.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rdoc | 6.6.3.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rexml | 3.4.4-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rss | 0.3.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-test-unit | 3.6.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-typeprof | 0.21.9-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem4.0-bigdecimal | 4.0.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-devel +2 | 4.0.16-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-io-console | 0.8.2-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-irb | 1.16.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-json | 2.18.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-minitest | 6.0.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-power_assert | 3.0.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-psych | 5.3.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-racc | 1.8.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rake | 13.3.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rbs | 3.10.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rdoc | 7.0.4-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rexml | 3.4.4-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rss | 0.3.2-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-test-unit | 3.7.5-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-typeprof | 0.31.1-37.3.hum1 | RHSA-2026:62563 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssl +3 | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux 9 | openssl +3 | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssl | 1:3.5.5-4.el10_2 | RLSA-2026:25237 |
| Rocky Linux 9 | openssl | 1:3.5.5-4.el9_8 | RLSA-2026:25239 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | nodejs24 | 24.18.1-150700.15.18.1 | SUSE-SU-2026:3835-1 |
| SLES 15 SP7 | openssl | 3.5.0-150700.3.4.1 | SUSE-SU-2026:3835-1 |
| SLES 15 SP7 | openssl-3 | 3.5.0-150700.5.45.2 | SUSE-SU-2026:3835-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22315-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22315-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22251-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-6.1 | openSUSE-SU-2026:11023-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.8.1 | openSUSE-SU-2026:21005-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.7-r0 | — |
| Alpine v3.23 | openssl | 3.5.7-r0 | — |
| Alpine v3.22 | openssl | 3.5.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.5.5-1.amzn2023.0.5 | ALAS2023-2026-1853 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssl +3 | 1:3.5.5-5.0.1.el10_2 | ELSA-2026-25237 |
| Oracle Linux 9 | openssl +3 | 1:3.5.5-4.0.1.el9_8 | ELSA-2026-50379, ELSA-2026-25239 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl +1 | 3.6.3-r0 | — |
| Wolfi rolling | openssl-4.0 +2 | 4.0.1-r0 | — |
Advisories 27
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- WID-SEC-2026-1852 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:25239 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:25237 Important: openssl 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
- RHSA-2026:67551 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62790 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62562 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62563 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59635 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59641 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:55543 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:42825 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:25239 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:25237 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:3835-1 Security update for openssl, openssl-3 SUSE / openSUSE Security Updates · Sep 10, 2026
- NCSC-2026-0307 Kwetsbaarheden verholpen in Oracle Database Producten NCSC-NL (Netherlands) · Aug 19, 2026
- ELSA-2026-25237 Important: openssl security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 28, 2026
- ELSA-2026-50379 Moderate: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 7, 2026
- SUSE-SU-2026:22315-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21005-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22251-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 30, 2026
- ELSA-2026-25239 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- ALAS2023-2026-1853 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 22, 2026
- openSUSE-SU-2026:11023-1 libopenssl-3-devel-3.5.3-6.1 on GA media SUSE / openSUSE Security Updates · Jun 14, 2026
- RLSA-2026:25237 Important: openssl security update Rocky Linux Security Advisories · Jun 13, 2026
- RLSA-2026:25239 Important: openssl security update Rocky Linux Security Advisories · Jun 13, 2026
References
- OpenSSL Advisory vendor-advisory
- 4.0.1 git commit patch
- 3.6.3 git commit patch
- 3.5.7 git commit patch