Description
Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proximate attackers to obtain the server's private key by determining factors using crafted ciphertext and the fluctuations in the electromagnetic field during multiplication.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | Libgcrypt | before 1.6.3 | — |
| GNU | GnuPG | before 1.4.19 | — |
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 | libgcrypt20 | 1.6.3-2 | — |
| Debian 13 | libgcrypt20 | 1.6.3-2 | — |
| Debian 12 | libgcrypt20 | 1.6.3-2 | — |
| Debian 7 | gnupg | 1.4.12-7+deb7u7 | DSA-3184-1 |
| Debian 7 | libgcrypt11 | 1.5.0-5+deb7u3 | DSA-3185-1 |
| Debian 6.0 | gnupg | 1.4.10-4+squeeze7 | DLA-175-1 |
| Debian 6.0 | libgcrypt11 | 1.4.5-2+squeeze3 | DLA-190-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | gnupg | 1.4.16-1ubuntu2.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | gnupg2 | 2.0.22-3ubuntu1.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | libgcrypt11 | 1.5.3-2ubuntu4.2 | USN-2555-1 |
| Ubuntu 14.04 LTS | libgcrypt20 | 1.6.1-2ubuntu1.14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | libgcrypt | 1.6.1-13.1 | SUSE-SU-2015:1179-1 |
| SLES 11 SP4 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
| SLES 11 SP3 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | libgcrypt | 1.6.1-13.1 | SUSE-SU-2015:1179-1 |
| SLES for SAP 11 SP4 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
| SLES for SAP 11 SP3 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libgcrypt | 1.7.3-1.3 | openSUSE-SU-2024:10037-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | 2.06-25 | — |
Advisories 9
- USN-2555-1 libgcrypt11, libgcrypt20 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3185-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3184-1 gnupg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-190-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-175-1 gnupg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2554-1 gnupg, gnupg2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:10037-1 libgcrypt-cavs-1.7.3-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1626-1 Security update for libgcrypt SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2015:1179-1 Security update for libgcrypt SUSE / openSUSE Security Updates · May 2, 2025