CVE-2026-56449: apache software foundation apache http server Out-of-bounds Write
CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2026-56449RHBA-2026:50158UBUNTU-CVE-2026-56449DEBIAN-CVE-2026-56449
Published 01-10-2026Last modified 01-10-2026
Vulnerability summary
CVE-2026-56449 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in apache software foundation apache http server. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.3% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.61%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 01-10-2026PublishedVulnerability first disclosed.
- 01-10-2026Last modifiedVulnerability information updated.
Description
Out-of-bounds Write vulnerability in Apache HTTP Server's mod_proxy_html with crafted HTTP response bodies. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
CVSS metrics
6 scores · 6 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSources6 sources · 3.7–7.5
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · Red hatEcosystem advisory · calculated3.7LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.61%
Chance of exploitation in the next 30 days
Percentile
48%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
02-10-202620-10-2026
EPSS score0.61%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat20 products
- httpd< 0:2.4.63-13.el10_2.5
- httpd-core< 0:2.4.63-13.el10_2.5
- httpd-core-debuginfo< 0:2.4.63-13.el10_2.5
- httpd-debuginfo< 0:2.4.63-13.el10_2.5
- httpd-debugsource< 0:2.4.63-13.el10_2.5
Alpine1 product
- apache2< 2.4.69-r0
Apache1 product
- http_server≥ 2.4.0, < 2.4.69
Apache software foundation1 product
- apache http server≥ 2.4.0, ≤ 2.4.68
Debian1 product
- apache2All versions (No fix recorded) | < 2.4.69-1~deb13u1 | < 2.4.69-1
Ubuntu1 product
- apache2All versions (No fix recorded)
6 vendors · 25 products
