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8.8
CVE-2026-49975EXPLOITEDPATCHED
apache · http_server

Apache HTTP Server: mod_http2 denial of service

Description

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.

Affected Products

VendorProductVersions
apachehttp_server2.4.17

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
apachehttpcert_advisory90%
debiandebian_linuxcve_cpe95%
f5nginxcve_cpe95%
oraclesolariscert_advisory90%

References

  • https://httpd.apache.org/security/vulnerabilities_24.html(vendor-advisory)

Related News (12 articles)

Tier B
BSI Advisories6d ago
[NEU] [hoch] Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen
→ No new info (linked only)
Tier D
SecurityWeek27d ago
Citrix Patches NetScaler Vulnerabilities, Including New ‘HTTP/2 Bomb’ Attack
→ No new info (linked only)
Tier B
CERT-FR40d ago
Vulnérabilité dans Synacor Zimbra Collaboration (18 juin 2026)
→ No new info (linked only)
Tier B
CERT-FR48d ago
Multiples vulnérabilités dans les produits Microsoft (10 juin 2026)
→ No new info (linked only)
Tier B
BSI Advisories49d ago
[NEU] [hoch] Apache HTTP Server: Mehrere Schwachstellen
→ No new info (linked only)
Tier A
Microsoft MSRC49d ago
CVE-2026-49975 Apache HTTP Server: mod_http2 denial of service
→ No new info (linked only)
Tier B
CERT-FR49d ago
Multiples vulnérabilités dans Apache HTTP Server (09 juin 2026)
→ No new info (linked only)
Tier C
oss-security49d ago
CVE-2026-49975: Apache HTTP Server: mod_http2 denial of service
→ No new info (linked only)
Tier B
BSI Advisories53d ago
[NEU] [hoch] HTTP/2-Implementierungen: Schwachstelle ermöglicht Denial of Service
→ No new info (linked only)
Tier D
CSO Online53d ago
HTTP/2’s speed abused to slow webserver performance in DoS attack
→ No new info (linked only)
Tier C
VulDB54d ago
CVE-2026-49975 | Apache HTTP Server mod_http2 denial of service
→ No new info (linked only)
Tier B
BSI Advisories60d ago
[UPDATE] [mittel] Apache HTTP Server: Mehrere Schwachstellen ermöglichen Manipulation von Daten
→ No new info (linked only)
CVSS 3.18.8 NONE
CISA KEV❌ No
Actively exploited✅ Yes
Patch available
2.4.68
CWECWE-789
PublishedJun 8, 2026
Last enriched27d agov4
Tags
data manipulationmultiple vulnerabilitiesapache http serverDoSHTTP/2 Bomb
Trending Score36
Source articles12
Independent7
Info Completeness10/14
Missing: epss, kev, iocs, mitre_attack

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Related CVEs (5)

HIGHCVE-2026-23918EXP
Apache HTTP Server: http2: double free and possible RCE on early reset
Trending: 86
CRITICALCVE-2026-43512
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CRITICALCVE-2026-41293EXP
Apache Tomcat: HTTP/2 request headers not validated
Trending: 36
HIGHCVE-2026-29167EXP
Apache HTTP Server: mod_ldap per-dir use-after-free
Trending: 34
CRITICALCVE-2026-44631
Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
Trending: 33

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Jun 8, 2026
Discovered by ZDM
Jun 8, 2026
Updated: severity, exploitAvailable, activelyExploited
Jun 8, 2026
Updated: affectedVersions, severity, patchAvailable
Jun 9, 2026
Updated: affectedVersions, cvssEstimate, cweIds, tags
Jul 1, 2026
Actively Exploited
Jul 10, 2026
Exploit Available
Jul 10, 2026
Patch Available
Jul 10, 2026

Version History

v4
Last enriched 27d ago
v4Tier D27d ago

Updated description with details on the HTTP/2 Bomb exploit, changed vendor and product to Citrix NetScaler, added affected versions, updated severity to HIGH, and included CVSS score of 8.8.

affectedVersionscvssEstimatecweIdstags
via SecurityWeek
v3Tier B49d ago

Updated affected versions to include 2.4.68, changed severity to HIGH, and provided the fixed version number.

affectedVersionsseveritypatchAvailable
via CERT-FR
v2Tier C49d ago

Updated severity to MEDIUM, marked exploit as available, and noted that it is actively exploited.

severityexploitAvailableactivelyExploited
via oss-security
v149d ago

Initial creation