7.5

CVE-2026-63686: apache software foundation apache http server NULL Pointer Dereference

CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2026-63686UBUNTU-CVE-2026-63686DEBIAN-CVE-2026-63686
Published 01-10-2026Last modified 01-10-2026
Open JSON

Vulnerability summary

CVE-2026-63686 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in apache software foundation apache http server. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
MGASA-2026-0502RHSA-2026:74858USN-8931-1

Timeline

  1. 01-10-2026
    PublishedVulnerability first disclosed.
  2. 01-10-2026
    Last modifiedVulnerability information updated.

Description

A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds then fails. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

02-10-202618-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • apache2< 2.4.69-r0
Apache1 product
Apache software foundation1 product
Debian1 product
  • apache2All versions (No fix recorded) | < 2.4.69-1~deb13u1 | < 2.4.69-1
Ubuntu1 product
  • apache2All versions (No fix recorded) | < 2.4.7-1ubuntu4.22+esm17 | < 2.4.18-2ubuntu3.17+esm22 | < 2.4.29-1ubuntu4.27+esm13 | < 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

References

8 links