Description
Issue summary: When a delta CRL that contains a Delta CRL Indicator extension
is processed a NULL pointer dereference might happen if the required CRL
Number extension is missing.
Impact summary: A NULL pointer dereference can trigger a crash which
leads to a Denial of Service for an application.
When CRL processing and delta CRL processing is enabled during X.509
certificate verification, the delta CRL processing does not check
whether the CRL Number extension is NULL before dereferencing it.
When a malformed delta CRL file is being processed, this parameter
can be NULL, causing a NULL pointer dereference.
Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in
the verification context, the certificate being verified to contain a
freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and
an attacker to provide a malformed CRL to an application that processes it.
The vulnerability is limited to Denial of Service and cannot be escalated to
achieve code execution or memory disclosure. For that reason the issue was
assessed as Low severity according to our Security Policy.
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, 1.1.1 – < 1.1.1zg, 1.0.2 – < 1.0.2zp | 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 | edk2 | No fix yet | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.23 | — |
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 | 3.0.2-0ubuntu1.23+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.24.3 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssl | 1.1.1-1ubuntu2.fips.2.1~18.04.23.8 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | openssl | 1.0.2g-1ubuntu4.fips.4.20.15 | — |
| 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+esm3 | — |
| Ubuntu Pro 18.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm8 | — |
| Ubuntu Pro 18.04 LTS | openssl1.0 | 1.0.2n-1ubuntu5.13+esm4 | — |
| Ubuntu Pro 16.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openssl | 1.0.2g-1ubuntu4.20+esm15 | — |
| Ubuntu Pro 14.04 LTS | openssl | 1.0.1f-1ubuntu2.27+esm13 | — |
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-2026:2399-1, 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-2026:2399-1, 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-2026:2399-1, 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-2026:2399-1, 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-2026:2396-1, 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-2026:2399-1, 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-2026:2399-1, 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-2026:2399-1, 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-2026:2399-1, 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 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.5.5-1.amzn2023.0.4 | ALAS2023-2026-1586 |
| Amazon Linux 2 | edk2-ovmf +3 | 20240813-307.amzn2 | ALAS2-2026-3275 |
| Amazon Linux 2 | openssl +4 | 1:1.0.2k-24.amzn2.0.20 | ALAS2-2026-3274 |
| Amazon Linux 2 | openssl11 +3 | 1:1.1.1zg-1.amzn2.0.1 | ALAS2-2026-3249 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | openssl | 3.3.5-5 | — |
| Azure Linux 3 | openssl-fips-provider | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl +1 | 3.6.2-r0 | — |
Advisories 33
- 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-26-293-05 Hitachi Energy RTU500 Product CISA ICS & IT advisories · 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-2026-3167 Hitachi Energy RTU500: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2026
- SUSE-SU-2026:2396-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Jun 16, 2026
- SUSE-SU-2026:2399-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Jun 16, 2026
- ICSA-26-134-10 Siemens SIMATIC CISA ICS & IT advisories · May 14, 2026
- ICSA-24-102-01 Siemens SIMATIC S7-1500 TM MFP 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
- ALAS2-2026-3274 Moderate: openssl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 29, 2026
- ALAS2-2026-3275 Important: edk2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 29, 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
- ALAS2-2026-3249 Important: openssl11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- ALAS2023-2026-1586 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 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