CVE-2026-49975

highpriority · track · 11EPSS 0.042 · 91 %ileexploit · PoCDEEUJPRUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

14 exploits · PoC

Likely / severe?

4.17% (91st) EPSS

CVSS 7.3 · high

Is it mine?

21 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-24

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.3highAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-409USCWE-770USCWE-789US

exploits (14)

Public proof-of-concept and weaponised exploit code.

0xc03307b/CVE-2026-49975HTTP2-BombPoC · poc_in_github
EQSTLab/CVE-2026-49975HTTP/2 BombPoC · poc_in_github
LSG-PolarBear/CVE-2026-49975CVE-2026-49975漏洞复现PoC · poc_in_github
LiaoZiqi-GZFLS/CVE-2026-49975CVE-2026-49975PoC · poc_in_github
Manisso/http2-bombProof of Concept (PoC) for CVE-2026-49975 – HTTP/2 server memory exhaustion attack leveraging HPACK amplification and connection retention (HTTP/2 Slowloris).PoC · poc_in_github
fevar54/Proof-of-Concept-POC---CVE-2026-49975-HTTP-2-Bomb-PoC de CVE-2026-49975 (HTTP/2 Bomb): DoS remoto contra servidores web con HTTP/2 por defecto.PoC · poc_in_github

affected products (21)

Products and version ranges known to be affected.

Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
IBM IBM QRadar SIEM <7.5.0 UP16 IF01< 7.5.0 UP16 IF01cert_bundDE
IBM IBM QRadar SIEM <7.6.0.3< 7.6.0.3cert_bundDE
IBM QRadar SIEM< 7.5.0 UP16 IF01cert_bundDE
IBM QRadar SIEM< 7.6.0.3cert_bundDE
Apache Software Foundation Apache HTTP Server≤ 2.4.17 ≤2.4.67enisa_euvdEU
Apache Software Foundation HTTP Server≤ 2.0.41fstec_bduRU
Cloudflare, Inc Pingoraall versionsfstec_bduRU
Microsoft Corp Microsoft IISall versionsfstec_bduRU
Microsoft Corp Windows Server 2025all versionsfstec_bduRU
NGINX Inc. nginx≤ 1.29.8fstec_bduRU
АО «ИВК» АЛЬТ СП 10all versionsfstec_bduRU
АО «СберТех» Platform V SynGX≤ 3.2.0-fstecfstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
Сообщество свободного программного обеспечения Envoyall versionsfstec_bduRU
apache http server2.4.17 → 2.4.68nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
debian debian linux= 11.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*

showing 20 of 21

advisories (6)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1791HTTP/2-Implementierungen: Schwachstelle ermöglicht Denial of ServiceDeutsch2026-06-04csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in verschiedenen HTTP/2-Implementierungen ausnutzen, um einen Denial of Service Angriff durchzuführen.
WID-SEC-W-2026-1824Apache HTTP Server: Mehrere SchwachstellenDeutsch2026-06-08csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um beliebigen Programmcode auszuführen, Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu verändern und offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder andere nicht näher definierte Angriffe durchzuführen.
WID-SEC-W-2026-2455Oracle Solaris Drittanbieterkomponenten: Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in verschiedenen Komponenten von Drittanbietern in Oracle Solaris ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.
WID-SEC-W-2026-3595IBM QRadar SIEM: Mehrere SchwachstellenDeutsch2026-09-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
BIT-apache-2026-49975Apache HTTP Server: mod_http2 denial of service2026-06-10vendor · osvUS
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.
JVNDB-2026-026849JVN iPedia advisory JVNDB-2026-0268492026-08-05vendor · jvndbJP

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv jvndb NVD CVE.org MITRE

published 2026-06-08modified 2026-08-19

references (25)

External citations — patches, advisories, analysis.

https://httpd.apache.org/security/vulnerabilities_24.htmlPatchcnnvd
https://nvd.nist.gov/vuln/detail/CVE-2026-49975 cnnvd
https://httpd.apache.org/security/vulnerabilities_24.html enisa_euvd
http://www.openwall.com/lists/oss-security/2026/06/03/3Mailing ListThird Party Advisorynvd
http://www.openwall.com/lists/oss-security/2026/06/08/16Mailing ListThird Party Advisorynvd
https://access.redhat.com/errata/RHSA-2026:25042 nvd
https://access.redhat.com/errata/RHSA-2026:25057 nvd
https://access.redhat.com/errata/RHSA-2026:25090 nvd

scry

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