CVE-2026-30909: Timlegge Crypt::nacl::sodium

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Crypt::NaCl::Sodium versions through 2.002 for Perl has potential integer overflows. bin2hex, encrypt, aes256gcm_encrypt_afternm and seal functions do not check that output size will be less than SIZE_MAX, which could lead to integer wraparound causing an undersized output buffer. Encountering this issue is unlikely as the message length would need to be very large. For bin2hex() the bin_len would have to be > SIZE_MAX / 2 For encrypt() the msg_len would need to be > SIZE_MAX - 16U For aes256gcm_encrypt_afternm() the msg_len would need to be > SIZE_MAX - 16U For seal() the enc_len would need to be > SIZE_MAX - 64U

Affected products

• Timlegge Crypt::nacl::sodium: before 2.003 (fixed in 2.003)

Published 2026-03-08. Last modified 2026-06-17.