CVE-2026-49975 (GCVE-0-2026-49975)
Vulnerability from cvelistv5 – Published: 2026-06-08 15:26 – Updated: 2026-08-19 12:05
VLAI
EPSS
VEX
Title
Apache HTTP Server: mod_http2 denial of service
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 10:27 UTC
CWE
Assigner
References
22 references
Impacted products
23 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.17 , ≤ 2.4.67
(semver)
|
guessed | |
| Red Hat | JBoss Core Services for RHEL 8 |
Unaffected:
0:2.4.62-13.el8jbcs , < *
(rpm)
cpe:/a:redhat:jboss_core_services:1::el8 |
||
| Red Hat | JBoss Core Services for RHEL 8 |
Unaffected:
0:2.0.29-10.el8jbcs , < *
(rpm)
cpe:/a:redhat:jboss_core_services:1::el8 |
||
| Red Hat | JBoss Core Services on RHEL 7 |
Unaffected:
0:2.4.62-13.el7jbcs , < *
(rpm)
cpe:/a:redhat:jboss_core_services:1::el7 |
||
| Red Hat | JBoss Core Services on RHEL 7 |
Unaffected:
0:2.0.29-10.el7jbcs , < *
(rpm)
cpe:/a:redhat:jboss_core_services:1::el7 |
||
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:2.0.29-4.el10_2.1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:2.0.29-2.el10_0.2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
||
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260608081321.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
8040020260702193120.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4 |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
8040020260702193120.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.4 |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
8060020260702195216.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6 |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
8060020260702195216.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.6 |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
8080020260702200145.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
8080020260702200145.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:2.0.26-6.el9_8.1 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:1.15.19-4.el9_2.8 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:2.0.26-2.el9_4.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:2.0.26-4.el9_6.2 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
||
| Red Hat | Red Hat JBoss Core Services 2.4.62.SP4 |
Unaffected:
httpd24-httpd , < *
(rpm)
Unaffected: httpd24-mod_http2 , < * (rpm) cpe:/a:redhat:jboss_core_services:1 |
||
| Red Hat | Red Hat Hardened Images |
Unaffected:
2.4.68-1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat OpenShift Service Mesh 2.6 |
Unaffected:
1781604724 , < *
(rpm)
cpe:/a:redhat:service_mesh:2.6::el9 |
||
| Red Hat | Red Hat JBoss Core Services |
cpe:/a:redhat:jboss_core_services:1
|
||
| Red Hat | Red Hat JBoss Web Server 5 |
cpe:/a:redhat:jboss_enterprise_web_server:5
|
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{
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{
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"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
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"packageName": "jbcs-httpd24-mod_proxy_cluster",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
},
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"cpes": [
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],
"defaultStatus": "unaffected",
"packageName": "jbcs-httpd24-mod_security",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
},
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],
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"packageName": "jbcs-httpd24-nghttp2",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
},
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],
"defaultStatus": "unaffected",
"packageName": "jbcs-httpd24-openssl",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
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"packageName": "jbcs-httpd24-openssl-chil",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
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"cpes": [
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"packageName": "jbcs-httpd24-openssl-pkcs11",
"product": "Red Hat JBoss Core Services",
"vendor": "Red Hat"
},
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"cpes": [
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],
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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