CVE-2026-30910Network attack vector

Service crash or memory corruption via size wraparound

Published Mar 8, 2026 · Updated Mar 8, 2026

Integer overflow in Crypt::Sodium::XS 0.001000 and earlier allows remote attackers to crash a service via an oversized message. The combined AEAD, signature, and bin2hex paths add expansion bytes to message lengths without first proving the result is below SIZE_MAX, so allocation sizes wrap. Triggering requires messages near SIZE_MAX; bin2hex and most encryption paths crash, while aes256gcm and signature paths can overwrite an undersized buffer.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Crypt::Sodium::XS 0.001000 and earlier allows remote attackers to crash a service via an oversized message. The combined AEAD, signature, and bin2hex paths add expansion bytes to message lengths without first proving the result is below SIZE_MAX, so allocation sizes wrap. Triggering requires messages near SIZE_MAX; bin2hex and most encryption paths crash, while aes256gcm and signature paths can overwrite an undersized buffer.

The record

CVE
CVE-2026-30910
Published
Mar 8, 2026
Updated
Mar 8, 2026
Vendor
Brad Barden
Product
Crypt::Sodium::XS
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.001000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brad Barden · Crypt::Sodium::XSversion=0 <=0.001000

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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