VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished EPSS 33% probability of exploitation in 30 days
Apache

CVE-2026-49975: Apache HTTP Server: mod_http2 denial of service

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
33%

EPSS score, percentile 98.4 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
7.5 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • 2.4.17 through 2.4.67

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

What to do

Advisories and patches

Affected products and versions

As listed in the CVE record.

Apache Software Foundation Apache HTTP Server
StatusVersions
Affected2.4.17 through 2.4.67

Versions not listed are: unaffected.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

About this vulnerability

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

Summary: CVE record, as of .

  • CISA has not added CVE-2026-49975 to its Known Exploited Vulnerabilities (KEV) catalog, as of 28 Oct 2026.
  • The CVE record was published on 8 Jun 2026.
  • The CVE record carries a CVSS v3.1 base score of 7.5 (High), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 33% (percentile 98.4), as of 28 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • CISA's SSVC assessment in the CVE record: exploitation poc, automatable yes, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.

Description

Apache HTTP Server: mod_http2 denial of service

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

Weakness

  • CWE-789: Memory Allocation with Excessive Size Value

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

Known exploited Apache vulnerabilities

  • CVE-2016-3081: Apache Struts Command Injection Vulnerability (added )
  • CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability (added )
  • CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability (added )
  • CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability (added )
  • CVE-2025-24813: Apache Tomcat Path Equivalence Vulnerability (added )