9.1

CVE-2026-32327: apache software foundation apache portable runtime utility Uncontrolled Recursion

CVSS: 9.1v3.1CriticalAnalyzed
AliasesALPINE-CVE-2026-32327UBUNTU-CVE-2026-32327DEBIAN-CVE-2026-32327
Published 06-08-2026Last modified 06-08-2026
Open JSON

Vulnerability summary

CVE-2026-32327 is a critical (CVSS 9.1) Uncontrolled Recursion vulnerability in apache software foundation apache portable runtime utility. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 6
MGASA-2026-0364OPENSUSE-SU-2026:21672-1RHSA-2026:58474RHSA-2026:66341RHSA-2026:66392RHSA-2026:69113

Timeline

  1. 06-08-2026
    PublishedVulnerability first disclosed.
  2. 06-08-2026
    Last modifiedVulnerability information updated.

Description

A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

0.00 pp

From 0.46% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.46%

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
  • apr-util< 1.6.4-r0
Apache1 product
Apache software foundation1 product
Debian1 product
  • apr-util< 1.6.3-1+deb12u1 | < 1.6.3-3+deb13u1 | < 1.6.4-1
Ubuntu1 product
  • apr-util< 1.5.3-1ubuntu0.1~esm3 | < 1.6.1-2ubuntu0.1+esm1 | < 1.6.1-4ubuntu2.2+esm1 | < 1.6.1-5ubuntu4.22.04.3 | < 1.6.3-1.1ubuntu7.1 | < 1.6.3-3ubuntu3.1

5 vendors · 5 products

References

8 links