EUVD-2026-26443
Incorrect Provision of Specified Functionality (CWE-684)
2026-04-30
mitre
6.5
CVSS 3.1
Share
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Lifecycle Timeline
6
Patch released
May 01, 2026 - 17:51 nvd
Patch available
Patch available
Apr 30, 2026 - 23:02 EUVD
Analysis Generated
Apr 30, 2026 - 22:00 vuln.today
EUVD ID Assigned
Apr 30, 2026 - 21:45 euvd
EUVD-2026-26443
Analysis Generated
Apr 30, 2026 - 21:45 vuln.today
CVE Published
Apr 30, 2026 - 00:00 nvd
MEDIUM 6.5
DescriptionNVD
In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.
AnalysisAI
Out-of-bounds heap write in Exim before 4.99.2 allows unauthenticated remote attackers to cause denial of service and potentially corrupt memory when the JSON lookup feature is enabled and malformed JSON is present in untrusted email headers, due to incorrect backslash escape sequence handling in the JSON operator.
Sign in for full analysis, threat intelligence, and remediation guidance.
More from same product – last 7 days
Vendor StatusVendor
Share
External POC / Exploit Code
Leaving vuln.today
Destination URL
POC code from unknown sources may be malicious, contain backdoors, or be fake.
Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).