PatchTheCVECVE-2024-28757: libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (c
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HIGH 7.5REMOTEUPGRADEMITIGATEMITIGATE
CVE-2024-28757 is a high-severity flaw (CVSS 7.5) affecting libexpat, fedora, active iq unified manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.0% (top 19%) |
| CISA exploited list | No |
| Weakness | CWE-776 |
| Published | 2024-03-10 |
| Last modified | 2026-10-15 |
Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
libexpat project libexpat UPGRADE
Affected: < 2.6.2
Fixed in: 2.6.2
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy libexpat || rpm -q libexpat || libexpat --version
2. UPGRADE to 2.6.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade libexpat
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade libexpat
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
fedoraproject fedora MITIGATE
Affected: 38 · 39 · 40
Fixed in: no fixed release known
Safe to downgrade to: a release before 38
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
netapp active iq unified manager MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy active-iq-unified-manager || rpm -q active-iq-unified-manager || active-iq-unified-manager --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp oncommand workflow automation MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy oncommand-workflow-automation || rpm -q oncommand-workflow-automation || oncommand-workflow-automation --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp ontap DOWNGRADE
Affected: 9
Fixed in: no fixed release known
Safe to downgrade to: a release before 9
1. Check installed version
apt-cache policy ontap || rpm -q ontap || ontap --version
2. No fixed release: DOWNGRADE to a release before 9 (Debian / Ubuntu)
apt-cache madison ontap
sudo apt install ontap=<VERSION_BEFORE_9>
sudo apt-mark hold ontap
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list ontap
sudo dnf downgrade ontap-<VERSION_BEFORE_9>
sudo dnf versionlock add ontap
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
netapp ontap tools DOWNGRADE
Affected: 10
Fixed in: no fixed release known
Safe to downgrade to: a release before 10
1. Check installed version
apt-cache policy ontap-tools || rpm -q ontap-tools || ontap-tools --version
2. No fixed release: DOWNGRADE to a release before 10 (Debian / Ubuntu)
apt-cache madison ontap-tools
sudo apt install ontap-tools=<VERSION_BEFORE_10>
sudo apt-mark hold ontap-tools
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list ontap-tools
sudo dnf downgrade ontap-tools-<VERSION_BEFORE_10>
sudo dnf versionlock add ontap-tools
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-28757?
libexpat: upgrade to 2.6.2; fedora: mitigate or apply the listed mitigation; active iq unified manager: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2024-28757 being exploited?
CVE-2024-28757 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-28757 affect?
CVE-2024-28757 affects libexpat, fedora, active iq unified manager. Severity is high (CVSS 7.5). libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
How urgent is CVE-2024-28757?
Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action
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