CVE-2026-49975 (GCVE-0-2026-49975)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:26 – Updated: 2026-08-05 12:14
VLAI
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 10:27 UTC
CWE
  • CWE-789 - Memory Allocation with Excessive Size Value
  • CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
URL Tags
https://httpd.apache.org/security/vulnerabilities… vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/03/3
https://lists.debian.org/debian-lts-announce/2026…
http://www.openwall.com/lists/oss-security/2026/0…
https://github.com/EQSTLab/CVE-2026-49975 exploit
https://access.redhat.com/security/cve/CVE-2026-49975 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2485371 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:27200 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50538 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25225 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25090 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36846 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36831 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36373 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50572 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25057 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25042 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27201 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27114 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: 2.4.17 , ≤ 2.4.67 (semver)
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Red Hat JBoss Core Services for RHEL 8 Unaffected: 0:2.4.62-13.el8jbcs , < * (rpm)
    cpe:/a:redhat:jboss_core_services:1::el8
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Red Hat JBoss Core Services for RHEL 8 Unaffected: 0:2.0.29-10.el8jbcs , < * (rpm)
    cpe:/a:redhat:jboss_core_services:1::el8
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Red Hat JBoss Core Services on RHEL 7 Unaffected: 0:2.4.62-13.el7jbcs , < * (rpm)
    cpe:/a:redhat:jboss_core_services:1::el7
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Red Hat JBoss Core Services on RHEL 7 Unaffected: 0:2.0.29-10.el7jbcs , < * (rpm)
    cpe:/a:redhat:jboss_core_services:1::el7
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:2.0.29-4.el10_2.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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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
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260608081321.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260702193120.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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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
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260702195216.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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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
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260702200145.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260702200145.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.0.26-6.el9_8.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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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
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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
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Red Hat Red Hat Hardened Images Unaffected: 2.4.68-1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift Service Mesh 2.6 Unaffected: 1781604724 , < * (rpm)
    cpe:/a:redhat:service_mesh:2.6::el9
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Red Hat Red Hat JBoss Core Services     cpe:/a:redhat:jboss_core_services:1
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Red Hat Red Hat JBoss Web Server 5     cpe:/a:redhat:jboss_enterprise_web_server:5
 Create a notification for this product.
Credits
Quang Luong of Calif.IO in collaboration with OpenAI Codex
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}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.