Description
Issue summary: The generic elliptic-curve scalar multiplication used for
ECDSA and SM2 signature operations with curves that do not have a dedicated
implementation leaks information about the secret nonce through timing.
Impact summary: An attacker able to measure signing times may learn
information about the per-signature secret nonce, which over many signatures
can, via a lattice / Hidden Number Problem attack, lead to recovery of the
private key.
CWE: CWE-208: Observable Timing Discrepancy
Description: The generic elliptic-curve scalar multiplication used for
curves that do not have a dedicated constant-time implementation pads the
secret scalar with non-constant-time BIGNUM operations, so the time taken
depends on the value of the secret scalar derived from the ECDSA and SM2 nonce.
The leak is very small; observing it requires a large number of
measurements. The effect is largest for curves whose group order lies
on a machine-word boundary, such as brainpoolP384r1.
Applications using ECDSA signing over the Brainpool and other generic prime
curves, and SM2 signing on platforms that use the generic implementation,
are vulnerable to this issue.
The NIST curves P-256, P-384 and P-521 use dedicated constant-time
implementations and are not affected.
FIPS Impact: no
The FIPS modules are not affected: the approved NIST curves used in the FIPS
provider have dedicated constant-time implementations and do not use the
affected code path.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 4.0.0 – < 4.0.3, 3.6.0 – < 3.6.5, 3.5.0 – < 3.5.9, 3.4.0 – < 3.4.8, 3.0.0 – < 3.0.23, 1.1.1 – < 1.1.1zj, 1.0.2 – < 1.0.2zs | 4.0.3 |
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 | 3.6.5-1 | — |
| Debian 13 | openssl | 3.5.7-1~deb13u3 | — |
| Debian 12 | openssl | 3.0.22-1~deb12u2 | — |
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 | 3.5.5-1ubuntu3.6 | USN-8847-1 |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.16 | USN-8847-1 |
| Ubuntu 22.04 LTS | edk2 | No fix yet | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.30 | USN-8847-1 |
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 | No fix yet | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | openssl | No fix yet | — |
| 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+esm6 | USN-8847-2 |
| Ubuntu Pro 18.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm11 | USN-8847-2 |
| Ubuntu Pro 18.04 LTS | openssl1.0 | 1.0.2n-1ubuntu5.13+esm7 | USN-8847-2 |
| Ubuntu Pro 16.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openssl | 1.0.2g-1ubuntu4.20+esm19 | USN-8847-2 |
| Ubuntu Pro 14.04 LTS | openssl | 1.0.1f-1ubuntu2.27+esm17 | USN-8847-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | openssl +10 | 3.5.9-0.1.hum1 | RHSA-2026:74166, RHSA-2026:74162 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES 15 SP7 | openssl-1_1 | 1.1.1w-150700.11.35.1 | SUSE-SU-2026:5172-1 |
| SLES 15 SP7 | openssl-3 | 3.5.0-150700.5.53.2 | SUSE-SU-2026:4414-1 |
| SLES 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.43.1 | SUSE-SU-2026:5206-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.67.1 | SUSE-SU-2026:4419-1 |
| SLES 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.68.1 | SUSE-SU-2026:5197-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.80.1 | SUSE-SU-2026:4412-1 |
| SLES 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.107.1 | SUSE-SU-2026:5205-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.101.1 | SUSE-SU-2026:4413-1 |
| SLES 12 SP5 | openssl-1_1 | 1.1.1d-2.142.1 | SUSE-SU-2026:5196-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.11.1 | SUSE-SU-2026:24245-1 |
| SLES for SAP 15 SP6 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES for SAP 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.43.1 | SUSE-SU-2026:5206-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.67.1 | SUSE-SU-2026:4419-1 |
| SLES for SAP 15 SP5 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES for SAP 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.68.1 | SUSE-SU-2026:5197-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.80.1 | SUSE-SU-2026:4412-1 |
| SLES for SAP 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLES for SAP 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.107.1 | SUSE-SU-2026:5205-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.101.1 | SUSE-SU-2026:4413-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.11.1 | SUSE-SU-2026:24245-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.11.1 | SUSE-SU-2026:24188-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_14.1 | SUSE-SU-2026:24273-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-159998.1.1 | SUSE-SU-2026:24133-1 |
| SLE Micro 5.5 | openssl-1_1 | 1.1.1l-150500.17.68.1 | SUSE-SU-2026:5197-1 |
| SLE Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.107.1 | SUSE-SU-2026:5205-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.101.1 | SUSE-SU-2026:4413-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.101.1 | SUSE-SU-2026:4413-1 |
| SLE HPC 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.68.1 | SUSE-SU-2026:5197-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.80.1 | SUSE-SU-2026:4412-1 |
| SLE HPC 15 SP4 | openssl-1_0_0 | 1.0.2p-150000.3.116.1 | SUSE-SU-2026:5209-1 |
| SLE HPC 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.107.1 | SUSE-SU-2026:5205-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.101.1 | SUSE-SU-2026:4413-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.11.1 | openSUSE-SU-2026:22102-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.21 | openssl | 3.3.7-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | edk2-ovmf +3 | 20260508-2.amzn2023 | ALAS2023-2026-3227 |
| Amazon Linux 2023 | openssl +5 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 |
| Amazon Linux 2 | edk2-ovmf +3 | 20240813-314.amzn2 | ALAS2-2026-4007 |
| Amazon Linux 2 | openssl +4 | 1:1.0.2k-24.amzn2.0.23 | ALAS2-2026-3992 |
| Amazon Linux 2 | openssl11 +3 | 1:1.1.1zj-1.amzn2.0.1 | ALAS2-2026-3991 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-21 | — |
| Azure Linux 3 | openssl | 3.3.7-7 | — |
| Azure Linux 3 | qemu +5 | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl-4.0 +2 | 4.0.3-r0 | — |
Advisories 26
- SUSE-SU-2026:5209-1 Security update for openssl-1_0_0 SUSE / openSUSE Security Updates · Nov 12, 2026
- SUSE-SU-2026:5206-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Nov 12, 2026
- SUSE-SU-2026:5205-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Nov 12, 2026
- SUSE-SU-2026:5197-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Nov 12, 2026
- SUSE-SU-2026:5196-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Nov 12, 2026
- WID-SEC-2026-3638 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- SUSE-SU-2026:5172-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Nov 11, 2026
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- SUSE-SU-2026:24273-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 27, 2026
- ALAS2023-2026-3227 Important: edk2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2-2026-4007 Important: edk2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- SUSE-SU-2026:24245-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:24188-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 20, 2026
- RHSA-2026:74162 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:74166 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- openSUSE-SU-2026:22102-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:24133-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 15, 2026
- ALAS2-2026-3991 Important: openssl11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2-2026-3992 Important: openssl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3204 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- SUSE-SU-2026:4412-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:4413-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:4414-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:4419-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Oct 2, 2026
- USN-8847-2 openssl, openssl1.0 vulnerabilities Ubuntu Security Notices (USN) · Oct 2, 2026
- USN-8847-1 openssl vulnerabilities Ubuntu Security Notices (USN) · Oct 2, 2026
References
- OpenSSL Advisory vendor-advisory
- 4.0.3 git commit patch
- 3.6.5 git commit patch
- 3.5.9 git commit patch
- 3.4.8 git commit patch