Vulnerability · Published Jun 12, 2026 · Assigned by CPANSec
CVE-2026-9638Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts
High 7.5
In plain English
A high-severity security flaw in Crypt::PBKDF2 from ARODLAND. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 76.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libcrypt-pbkdf2-perl | 0.261630-1~deb13u1~deb12u1 | DEBIAN-CVE-2026-9638 |
| Debian:13 | libcrypt-pbkdf2-perl | 0.261630-1~deb13u1 | DEBIAN-CVE-2026-9638 |
| Debian:14 | libcrypt-pbkdf2-perl | 0.261630-1 | DEBIAN-CVE-2026-9638 |
| Ubuntu:22.04:LTS | libcrypt-pbkdf2-perl | no fix listed | UBUNTU-CVE-2026-9638 |
| Ubuntu:24.04:LTS | libcrypt-pbkdf2-perl | no fix listed | UBUNTU-CVE-2026-9638 |
| Ubuntu:25.10 | libcrypt-pbkdf2-perl | no fix listed | UBUNTU-CVE-2026-9638 |
| Ubuntu:26.04:LTS | libcrypt-pbkdf2-perl | no fix listed | UBUNTU-CVE-2026-9638 |
| Ubuntu:26.10 | libcrypt-pbkdf2-perl | no fix listed | UBUNTU-CVE-2026-9638 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ARODLAND | Crypt::PBKDF2 | 0 – before 0.261630 |
Weakness: CWE-338 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N