CVE-2026-30910: iamb crypt::sodium::xs Integer Overflow or Wraparound

Vulnerability summary

CVE-2026-30910 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in iamb crypt::sodium::xs. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.4% of scored vulnerabilities.

Timeline

1. 08-03-2026
   PublishedVulnerability first disclosed.
2. 10-03-2026
   Last modifiedVulnerability information updated.

Description

Crypt::Sodium::XS versions through 0.001000 for Perl has potential integer overflows. Combined aead encryption, combined signature creation, and bin2hex functions do not check that output size will be less than SIZE_MAX, which could lead to integer wraparound causing an undersized output buffer. This can cause a crash in bin2hex and encryption algorithms other than aes256gcm. For aes256gcm encryption and signatures, an undersized buffer could lead to buffer overflow. Encountering this issue is unlikely as the message length would need to be very large. For bin2hex the input size would have to be > SIZE_MAX / 2 For aegis encryption the input size would need to be > SIZE_MAX - 32U For other encryption the input size would need to be > SIZE_MAX - 16U For signatures the input size would need to be > SIZE_MAX - 64U

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.