Description
Issue summary: Converting an excessively large OCTET STRING value to
a hexadecimal string leads to a heap buffer overflow on 32 bit platforms.
Impact summary: A heap buffer overflow may lead to a crash or possibly
an attacker controlled code execution or other undefined behavior.
If an attacker can supply a crafted X.509 certificate with an excessively
large OCTET STRING value in extensions such as the Subject Key Identifier
(SKID) or Authority Key Identifier (AKID) which are being converted to hex,
the size of the buffer needed for the result is calculated as multiplication
of the input length by 3. On 32 bit platforms, this multiplication may overflow
resulting in the allocation of a smaller buffer and a heap buffer overflow.
Applications and services that print or log contents of untrusted X.509
certificates are vulnerable to this issue. As the certificates would have
to have sizes of over 1 Gigabyte, printing or logging such certificates
is a fairly unlikely operation and only 32 bit platforms are affected,
this issue was assigned 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 affected code is outside the OpenSSL FIPS module boundary.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 3.6.0 – < 3.6.2, 3.5.0 – < 3.5.6, 3.4.0 – < 3.4.5, 3.3.0 – < 3.3.7, 3.0.0 – < 3.0.20 | 3.6.2 |
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 | 3.6.2-1 | — |
| Debian 13 | openssl | 3.5.5-1~deb13u2 | — |
| Debian 12 | openssl | 3.0.19-1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | edk2 +1 | No fix yet | — |
| Ubuntu 26.10 | openssl | 3.5.5-1ubuntu3 | — |
| Ubuntu 26.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssl | 3.5.5-1ubuntu3 | — |
| Ubuntu 25.10 | edk2 | No fix yet | — |
| Ubuntu 25.10 | openssl | 3.5.3-1ubuntu3.3 | — |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.9 | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.23 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.12+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | openssl +5 | 3.5.6-0.1.hum1 | RHSA-2026:7261 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES 15 SP7 | openssl-1_1 | 1.1.1w-150700.11.16.1 | SUSE-SU-2026:1386-1 |
| SLES 15 SP7 | openssl-3 | 3.2.3-150700.5.31.1 | SUSE-SU-2026:1375-1 |
| SLES 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.26.2 | SUSE-SU-2026:1577-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.45.1 | SUSE-SU-2026:1215-1 |
| SLES 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.51.1 | SUSE-SU-2026:1290-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.60.1 | SUSE-SU-2026:1213-1 |
| SLES 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.90.1 | SUSE-SU-2026:1257-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.81.1 | SUSE-SU-2026:1214-1 |
| SLES 12 SP5 | openssl-1_0_0 | 1.0.2p-3.106.1 | SUSE-SU-2026:1256-1 |
| SLES 12 SP5 | openssl-1_1 | 1.1.1d-2.125.1 | SUSE-SU-2026:1255-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.7.1 | SUSE-SU-2026:21186-1 |
| SLES for SAP 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES for SAP 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.26.2 | SUSE-SU-2026:1577-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.45.1 | SUSE-SU-2026:1215-1 |
| SLES for SAP 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES for SAP 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.51.1 | SUSE-SU-2026:1290-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.60.1 | SUSE-SU-2026:1213-1 |
| SLES for SAP 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLES for SAP 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.90.1 | SUSE-SU-2026:1257-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.81.1 | SUSE-SU-2026:1214-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.7.1 | SUSE-SU-2026:21186-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.7.1 | SUSE-SU-2026:21107-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_9.1 | SUSE-SU-2026:21037-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-12.1 | SUSE-SU-2026:21065-1 |
| SLE Micro 5.5 | openssl-1_1 | 1.1.1l-150500.17.51.1 | SUSE-SU-2026:1290-1 |
| SLE Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.90.1 | SUSE-SU-2026:1257-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.81.1 | SUSE-SU-2026:1214-1 |
| SLE Micro 5.3 | openssl-1_1 | 1.1.1l-150400.7.90.1 | SUSE-SU-2026:1257-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.81.1 | SUSE-SU-2026:1214-1 |
| SLE Micro 5.2 | openssl-1_1 | 1.1.1d-150200.11.109.1 | SUSE-SU-2026:1216-1 |
| SLE HPC 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.51.1 | SUSE-SU-2026:1290-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.60.1 | SUSE-SU-2026:1213-1 |
| SLE HPC 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| SLE HPC 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.90.1 | SUSE-SU-2026:1257-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.81.1 | SUSE-SU-2026:1214-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-4.1 | openSUSE-SU-2026:10533-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.7.1 | openSUSE-SU-2026:20525-1 |
| openSUSE Leap 15.6 | openssl-1_0_0 | 1.0.2p-150000.3.105.1 | SUSE-SU-2026:1291-1 |
| openSUSE Leap 15.6 | openssl-3 | 3.1.4-150600.5.45.1 | SUSE-SU-2026:1215-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.6-r0 | — |
| Alpine v3.23 | openssl | 3.5.6-r0 | — |
| Alpine v3.22 | openssl | 3.5.6-r0 | — |
| Alpine v3.21 | openssl | 3.3.7-r0 | — |
| Alpine v3.20 | openssl | 3.3.7-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | openssl | 3.3.5-5 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl +1 | 3.6.2-r0 | — |
Advisories 23
- WID-SEC-2026-0995 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 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
- ICSA-26-134-10 Siemens SIMATIC CISA ICS & IT advisories · May 14, 2026
- NCSC-2026-0147 Kwetsbaarheden verholpen in Siemens-producten NCSC-NL (Netherlands) · May 13, 2026
- SSA-032379 SSA-032379: Multiple Vulnerabilities in SIMATIC CN 4100 Before V5.0 Siemens ProductCERT · May 12, 2026
- SUSE-SU-2026:1577-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 24, 2026
- openSUSE-SU-2026:20525-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:21186-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:21107-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 17, 2026
- SUSE-SU-2026:1386-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 17, 2026
- SUSE-SU-2026:1375-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 17, 2026
- SUSE-SU-2026:21037-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:21065-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:1290-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:1291-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Apr 14, 2026
- openSUSE-SU-2026:10533-1 libopenssl-3-devel-3.5.3-4.1 on GA media SUSE / openSUSE Security Updates · Apr 12, 2026
- SUSE-SU-2026:1256-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Apr 11, 2026
- SUSE-SU-2026:1255-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 11, 2026
- SUSE-SU-2026:1257-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 11, 2026
- SUSE-SU-2026:1214-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 9, 2026
- SUSE-SU-2026:1213-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 9, 2026
- SUSE-SU-2026:1215-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Apr 9, 2026
- SUSE-SU-2026:1216-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Apr 9, 2026
References
- OpenSSL Advisory vendor-advisory
- 3.6.2 git commit patch
- 3.5.6 git commit patch
- 3.4.5 git commit patch
- 3.3.7 git commit patch
- 3.0.20 git commit patch