Description
Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
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 13 | botan | 2.6.0-3 | — |
| Debian 12 | botan | 2.6.0-3 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | Botan | 2.18.1-1.3 | openSUSE-SU-2024:10594-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.21 | botan | 2.7.0-r0 | — |
| Alpine v3.20 | botan | 2.7.0-r0 | — |
| Alpine v3.19 | botan | 2.7.0-r0 | — |
| Alpine v3.18 | botan | 2.7.0-r0 | — |
| Alpine v3.17 | botan | 2.7.0-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.16 | botan | 2.7.0-r0 | — |
| Alpine v3.15 | botan | 2.7.0-r0 | — |
| Alpine v3.14 | botan | 2.7.0-r0 | — |
| Alpine v3.13 | botan | 2.7.0-r0 | — |
| Alpine v3.12 | botan | 2.7.0-r0 | — |
| Alpine v3.11 | botan | 2.7.0-r0 | — |
| Alpine v3.10 | botan | 2.7.0-r0 | — |
Advisories 1
- openSUSE-SU-2024:10594-1 Botan-2.18.1-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026