CVE-2026-48840 Vulnerability Analysis & Exploit Details

CVE-2026-48840
Vulnerability Scoring

5.3
/10
Significant Risk

Security assessments indicate that CVE-2026-48840 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-48840 Details

Status: Modified

Last updated: 🕚 05 Jun 2026, 11:16 UTC
Originally published on: 🕑 30 May 2026, 02:16 UTC

Time between publication and last update: 6 days

CVSS Release: version 3

CVSS3 Source

cve@mitre.org

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVE-2026-48840 Vulnerability Summary

CVE-2026-48840: Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

Assessing the Risk of CVE-2026-48840

Access Complexity Graph

The exploitability of CVE-2026-48840 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-48840

With low attack complexity and no required privileges, CVE-2026-48840 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-48840, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-48840, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-48840 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: None
    CVE-2026-48840 poses no threat to data integrity.
  • Availability: None
    CVE-2026-48840 does not impact system availability.

CVE-2026-48840 References

External References

CWE Common Weakness Enumeration

CWE-839

Vulnerable Configurations

  • cpe:2.3:a:exim:exim:4.88:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc4:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc4:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc5:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc5:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.88:rc6:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.88:rc6:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89.1:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89.1:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc4:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc4:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc5:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc5:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc6:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc6:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.89:rc7:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.89:rc7:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90.0.22:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90.0.22:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90.0.27:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90.0.27:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90.1:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90.1:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.90:rc4:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.90:rc4:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.91:rc4:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.91:rc4:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92.2:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92.2:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc4:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc4:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc5:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc5:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.92:rc6:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.92:rc6:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.93:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.93:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.93.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.93.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.93.0.4-3.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.93.0.4-3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94.2:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94.2:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94:rc0:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94:rc0:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.94:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.94:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.95:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.95:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.95:rc0:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.95:rc0:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.95:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.95:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.95:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.95:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96.2:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96.2:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96:rc0:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96:rc0:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.96:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.96:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.97:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.97:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.97.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.97.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.97:rc0:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.97:rc0:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.97:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.97:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.97:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.97:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98.1:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98.2:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98.2:*:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98:rc0:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98:rc0:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98:rc1:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98:rc1:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98:rc2:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98:rc2:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.98:rc3:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.98:rc3:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.99:-:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.99:-:*:*:*:*:*:*
  • cpe:2.3:a:exim:exim:4.99.1:*:*:*:*:*:*:*
    cpe:2.3:a:exim:exim:4.99.1:*:*:*:*:*:*:*

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