CVE-2026-63718: apache software foundation apache http server HTTP Request/Response Smuggling
CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2026-63718UBUNTU-CVE-2026-63718DEBIAN-CVE-2026-63718
Published 01-10-2026Last modified 01-10-2026
Vulnerability summary
CVE-2026-63718 is a high (CVSS 7.5) HTTP Request/Response Smuggling vulnerability in apache software foundation apache http server. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.50%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3 · Related 1Timeline
- 01-10-2026PublishedVulnerability first disclosed.
- 01-10-2026Last modifiedVulnerability information updated.
Description
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') response smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi and a crafted uwsgi response with Transfer-Encoding. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.68.
CVSS metrics
5 scores · 5 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.50%
Chance of exploitation in the next 30 days
Percentile
42%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
02-10-202620-10-2026
EPSS score0.50%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- apache2< 2.4.69-r0
Apache1 product
- http_server≥ 2.4.30, < 2.4.69
Apache software foundation1 product
- apache http server≥ 2.4.30, ≤ 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) | < 2.4.41-4ubuntu3.23+esm9 | < 2.4.52-1ubuntu4.25 | < 2.4.58-1ubuntu8.17 | < 2.4.66-2ubuntu2.6
5 vendors · 5 products
