Description
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking.
The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery.
This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MIK | CryptX | < 0.088 | 0.088 |
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 | libcryptx-perl | 0.087-2 | — |
| Debian 13 | libcryptx-perl | 0.085-1+deb13u1 | — |
| Debian 12 | libcryptx-perl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libcryptx-perl | No fix yet | — |
| Ubuntu 26.04 LTS | libcryptx-perl | No fix yet | — |
| Ubuntu 25.10 | libcryptx-perl | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | libcryptx-perl | No fix yet | — |
| Ubuntu Pro 22.04 LTS | libcryptx-perl | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libcryptx-perl | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libcryptx-perl | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | perl-CryptX | 0.89.0-1.1 | openSUSE-SU-2026:10773-1 |
| openSUSE Leap 16.0 | perl-CryptX | 0.89.0-bp160.1.1 | openSUSE-SU-2026:20936-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | perl-cryptx | 0.088-r0 | — |
| Alpine v3.23 | perl-cryptx | 0.088-r0 | — |
| Alpine v3.22 | perl-cryptx | 0.088-r0 | — |
| Alpine v3.21 | perl-cryptx | 0.088-r0 | — |
| Alpine v3.20 | perl-cryptx | 0.088-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | perl-CryptX +1 | 0.088-2.amzn2023.0.1 | ALAS2023-2026-1641 |
Advisories 3
- openSUSE-SU-2026:20936-1 Security update for perl-CryptX SUSE / openSUSE Security Updates · Jun 13, 2026
- openSUSE-SU-2026:10773-1 perl-CryptX-0.89.0-1.1 on GA media SUSE / openSUSE Security Updates · May 14, 2026
- ALAS2023-2026-1641 Important: perl-CryptX security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 13, 2026