CVE•Published 2026-04-30•Modified 2026-05-01•0 articles on news•5 live references•NVD data
CVE-2026-40687Exim · Exim
Vulnerability data via NVD (ingested)
CVSS v3.1
4.8
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
EPSS percentile
—
Weaknesses (CWE)
Description
In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
Timeline
Published 2026-04-30
Modified 2026-05-01
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag474,978 hosts
vuln:CVE-2026-40687Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Exim Exim"All exposed Exim Exim instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Exim"HTTP body or banner mentions "Exim" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-40687Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-40687Censys host search filtered to this CVE id.
grep.app
CVE-2026-40687Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-40687GitHub code search for direct mentions.
Google dork
"CVE-2026-40687" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-40687 on GitHub.
We haven't classified any articles referencing CVE-2026-40687 yet. The external references above still apply.