Description
Issue summary: Writing large, newline-free data into a BIO chain using the
line-buffering filter where the next BIO performs short writes can trigger
a heap-based out-of-bounds write.
Impact summary: This out-of-bounds write can cause memory corruption which
typically results in a crash, leading to Denial of Service for an application.
The line-buffering BIO filter (BIO_f_linebuffer) is not used by default in
TLS/SSL data paths. In OpenSSL command-line applications, it is typically
only pushed onto stdout/stderr on VMS systems. Third-party applications that
explicitly use this filter with a BIO chain that can short-write and that
write large, newline-free data influenced by an attacker would be affected.
However, the circumstances where this could happen are unlikely to be under
attacker control, and BIO_f_linebuffer is unlikely to be handling non-curated
data controlled by an attacker. For that reason the issue was assessed as
Low severity.
The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,
as the BIO implementation is outside the OpenSSL FIPS module boundary.
OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 3.6.0 – < 3.6.1, 3.5.0 – < 3.5.5, 3.4.0 – < 3.4.4, 3.3.0 – < 3.3.6, 3.0.0 – < 3.0.19, 1.1.1 – < 1.1.1ze, 1.0.2 – < 1.0.2zn | 3.6.1 |
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 | 3.5.5-1 | — |
| Debian 13 | openssl | 3.5.4-1~deb13u2 | DSA-6113-1 |
| Debian 12 | openssl | 3.0.18-1~deb12u2 | DSA-6113-1 |
| Debian 11 | openssl | 1.1.1w-0+deb11u5 | DLA-4490-1 |
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 | 3.5.5-1ubuntu1 | — |
| Ubuntu 25.10 | edk2 | No fix yet | — |
| Ubuntu 25.10 | openssl | 3.5.3-1ubuntu3 | USN-7980-1 |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.7 | USN-7980-1 |
| Ubuntu 22.04 LTS | edk2 | No fix yet | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.21 | USN-7980-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.12+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl | 3.0.2-0ubuntu1.21+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | openssl | 1.1.1f-1ubuntu2.fips.24.2 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssl | 1.1.1-1ubuntu2.fips.2.1~18.04.23.7 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | openssl | 1.0.2g-1ubuntu4.fips.4.20.14 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 20.04 LTS | edk2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | openssl | 1.1.1f-1ubuntu2.24+esm2 | — |
| Ubuntu Pro 18.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm7 | — |
| Ubuntu Pro 18.04 LTS | openssl1.0 | 1.0.2n-1ubuntu5.13+esm3 | — |
| Ubuntu Pro 16.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openssl | 1.0.2g-1ubuntu4.20+esm14 | — |
| Ubuntu Pro 14.04 LTS | openssl | 1.0.1f-1ubuntu2.27+esm12 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssl +3 | 1:3.5.1-7.el10_1 | RHSA-2026:1472 |
| RHEL 9 | openssl +3 | 1:3.5.1-7.el9_7 | RHSA-2026:1473 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | openssl +5 | 3.5.6-0.1.hum1 | RHSA-2026:7261 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssl +3 | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux 9 | openssl +3 | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssl | 1:3.5.1-7.el10_1 | RLSA-2026:1472 |
| Rocky Linux 9 | openssl | 1:3.5.1-7.el9_7 | RLSA-2026:1473 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES 15 SP7 | openssl-1_1 | 1.1.1w-150700.11.11.1 | SUSE-SU-2026:0331-1 |
| SLES 15 SP7 | openssl-3 | 3.2.3-150700.5.24.1 | SUSE-SU-2026:0309-1 |
| SLES 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
| SLES 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLES 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLES 12 SP5 | openssl-1_0_0 | 1.0.2p-3.103.1 | SUSE-SU-2026:0333-1 |
| SLES 12 SP5 | openssl-1_1 | 1.1.1d-2.122.1 | SUSE-SU-2026:0358-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | openssl1 | 1.0.1g-58.90.2 | SUSE-SU-2026:0498-1 |
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20223-1 |
| SLES for SAP 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES for SAP 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
| SLES for SAP 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES for SAP 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLES for SAP 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLES for SAP 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20223-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20211-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_8.1 | SUSE-SU-2026:20373-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-11.1 | SUSE-SU-2026:20349-1 |
| SLE Micro 5.5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLE Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLE Micro 5.3 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLE Micro 5.2 | openssl-1_1 | 1.1.1d-150200.11.106.1 | SUSE-SU-2026:0343-1 |
| SLE HPC 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLE HPC 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| SLE HPC 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-2.1 | openSUSE-SU-2026:10237-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.5.1 | openSUSE-SU-2026:20152-1 |
| openSUSE Leap 15.6 | openssl-1_0_0 | 1.0.2p-150000.3.102.1 | SUSE-SU-2026:0332-1 |
| openSUSE Leap 15.6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| openSUSE Leap 15.6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.5-r0 | — |
| Alpine v3.23 | openssl | 3.5.5-r0 | — |
| Alpine v3.22 | openssl | 3.5.5-r0 | — |
| Alpine v3.21 | openssl | 3.3.6-r0 | — |
| Alpine v3.20 | openssl | 3.3.6-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.17 | openssl | 3.0.19-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.2.2-1.amzn2023.0.5 | ALAS2023-2026-1434 |
| Amazon Linux 2 | edk2-ovmf +3 | 20240813-306.amzn2 | ALAS2-2026-3150 |
| Amazon Linux 2 | openssl +4 | 1:1.0.2k-24.amzn2.0.17 | ALAS2-2026-3168 |
| Amazon Linux 2 | openssl11 +3 | 1:1.1.1zf-1.amzn2.0.1 | ALAS2-2026-3169 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-14 | — |
| Azure Linux 3 | openssl | 3.3.5-3 | — |
| Azure Linux 2 (CBL-Mariner) | edk2 | 20230301gitf80f052277c8-47 | — |
| Azure Linux 2 (CBL-Mariner) | hvloader | 1.0.1-18 | — |
| Azure Linux 2 (CBL-Mariner) | openssl | 1.1.1k-38 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssl +3 | 1:3.5.1-7.0.1.el10_1 | ELSA-2026-1472 |
| Oracle Linux 9 | openssl +3 | 1:3.5.1-7.0.1.el9_7 | ELSA-2026-50075, ELSA-2026-1473 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl | 3.6.1-r0 | — |
Advisories 45
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- WID-SEC-2026-0234 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- ALSA-2026:1472 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:1473 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7980-1 openssl vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- RHSA-2026:7261 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:1472 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:1473 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SSA-265688 SSA-265688: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- VDE-2026-076 ads-tec Industrial IT: Multiple Vulnerabilities in ADS-TEC IRF Products CERT@VDE · Jul 28, 2026
- VDE-2026-081 Weidmueller: Security routers IE-SR-4TX and IE-SR-4GT are affected by multiple vulnerabilities CERT@VDE · Jul 28, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- ICSA-24-102-01 Siemens SIMATIC S7-1500 TM MFP CISA ICS & IT advisories · May 14, 2026
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- openSUSE-SU-2026:20152-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10237-1 libopenssl-3-devel-3.5.3-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20349-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20223-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20211-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0498-1 Security update for openssl1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0359-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0358-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0343-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0331-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0333-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0360-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0332-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20373-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4490-1 openssl - security update Debian Security (DSA / DLA) · Feb 23, 2026
- ALAS2-2026-3150 Important: edk2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2-2026-3168 Important: openssl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2-2026-3169 Important: openssl11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2023-2026-1434 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- SUSE-SU-2026:0312-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0311-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0346-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0310-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0309-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2026:1472 Important: openssl security update Rocky Linux Security Advisories · Jan 30, 2026
- RLSA-2026:1473 Important: openssl security update Rocky Linux Security Advisories · Jan 30, 2026
- ELSA-2026-50075 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 29, 2026
- ELSA-2026-1472 Important: openssl security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jan 28, 2026
- ELSA-2026-1473 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 28, 2026
- DSA-6113-1 openssl - security update Debian Security (DSA / DLA) · Jan 27, 2026
References
- OpenSSL Advisory vendor-advisory
- 3.6.1 git commit patch
- 3.5.5 git commit patch
- 3.4.4 git commit patch
- 3.3.6 git commit patch
- 3.0.19 git commit patch