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VulnerabilityCVE-2026-49975Published 2026-06-08

CVE-2026-49975 — Apache HTTP Server

highPublic exploit11 PoC repos

As of 2026-08-19, CVE-2026-49975 is a HIGH-severity vulnerability in Apache HTTP Server, CVSS v3.1 7.5, EPSS 4.1% (90.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-49975, most recently “HTTP/2 Bomb — Remote DoS via HPACK Indexed-Reference Compression Bomb + Zero-Window Flow-Control Hold Affecting nginx, Apache httpd, IIS, Envoy & Cloudflare Pingora (CVE-2026-49975, Public PoC)”.

CVSS v3.1
7.5/10High
EPSS
4.1%Higher than 90.6% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
9.4/10Threadlinqs triage score
Published
Updated 2026-08-19
CVSS v3.1 7.5 (HIGH) · EPSS 4.1% (higher than 90.6% of all scored CVEs) · Priority 9.4/10 · Published 2026-06-08

Last updated:

What is CVE-2026-49975?

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.

The record classifies CVE-2026-49975 under weakness classes CWE-789, CWE-409. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 141 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (FIRST)
4.1% probability of exploitation in the next 30 days, higher than 90.6% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
9.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-08, last modified 2026-08-19

Is CVE-2026-49975 being exploited?

Weaponised exploit code for CVE-2026-49975 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-49975

No vendor patch reference has been recorded for CVE-2026-49975 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-49975

1 tracked threat in the Threadlinqs corpus references CVE-2026-49975, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .

Vendor advisory and patch