CVE-2026-6991Public exploitNetwork attack vector

SQL injection via permissive CUID validation

Published Apr 25, 2026 · Updated Apr 25, 2026

SQL injection in colinhacks Zod 4.3.0 through 4.3.6 allows remote authenticated users to inject SQL through crafted CUID values. The CUID regular expression accepts any non-whitespace, non-hyphen characters after an initial c or C instead of restricting identifiers to safe characters. Exploitation requires a consuming application to trust a validated CUID and concatenate it into SQL; the published PoC demonstrates XSS, not SQL injection.

CVSS severity6.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in colinhacks Zod 4.3.0 through 4.3.6 allows remote authenticated users to inject SQL through crafted CUID values. The CUID regular expression accepts any non-whitespace, non-hyphen characters after an initial c or C instead of restricting identifiers to safe characters. Exploitation requires a consuming application to trust a validated CUID and concatenate it into SQL; the published PoC demonstrates XSS, not SQL injection.

The record

CVE
CVE-2026-6991
Published
Apr 25, 2026
Updated
Apr 25, 2026
Vendor
colinhacks
Product
Zod
Classifications
CWE-89, CWE-74, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 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=4.3.0
  2. Affected versionversion=4.3.1
  3. Affected versionversion=4.3.2
  4. Affected versionversion=4.3.3
  5. Affected versionversion=4.3.4
  6. Affected versionversion=4.3.5
  7. Affected versionversion=4.3.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

colinhacks · Zodversion=4.3.0; version=4.3.1; version=4.3.2; version=4.3.3; version=4.3.4; version=4.3.5; version=4.3.6

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

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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