PatchTheCVECVE-2024-2398: When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for
65
This week
HIGH 8.6REMOTEUPGRADEUPGRADEMITIGATE
CVE-2024-2398 is a high-severity flaw (CVSS 8.6) affecting curl, macos, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for the push surpasses the maximum allowed limit (1000), libcurl aborts the server push. When aborting, libcurl inadvertently does not free all the previously allocated headers and instead leaks the memory. Further, this error condition fails silently and is therefore not easily detected by an application.
Why this priority
- High severity
- EPSS top 2%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.6 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 36.1% (top 2%) |
| CISA exploited list | No |
| Weakness | CWE-772 |
| Published | 2024-03-27 |
| 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
haxx curl UPGRADE
Affected: >= 7.44.0 and < 8.7.0
Fixed in: 8.7.0
Safe to downgrade to: a release before 7.44.0
1. Check installed version
apt-cache policy curl || rpm -q curl || curl --version
2. UPGRADE to 8.7.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade curl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade curl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 7.44.0 (Debian / Ubuntu)
apt-cache madison curl
sudo apt install curl=<VERSION_BEFORE_7.44.0>
sudo apt-mark hold curl
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list curl
sudo dnf downgrade curl-<VERSION_BEFORE_7.44.0>
sudo dnf versionlock add curl
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.
apple macos UPGRADE
Affected: < 12.7.6 · >= 13.0 and < 13.6.8 · >= 14.0 and < 14.6
Fixed in: 12.7.6, 13.6.8, 14.6
Safe to downgrade to: a release before 13.0
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.
fedoraproject fedora MITIGATE
Affected: 39 · 40
Fixed in: no fixed release known
Safe to downgrade to: a release before 39
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 ontap select deploy administration utility 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 ontap-select-deploy-administration-utility || rpm -q ontap-select-deploy-administration-utility || ontap-select-deploy-administration-utility --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp brocade fabric operating system MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
Exact fixes by distribution
A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · noctalia · FIXED · 5.4.1-1.fc46 · FEDORA-2026-a4755e8ef7 · source
sudo dnf upgrade --advisory=FEDORA-2026-a4755e8ef7
Fedora ELN · efifs · FIXED · 1.13-1.eln159 · FEDORA-2026-3fd0bb7307 · source
sudo dnf upgrade --advisory=FEDORA-2026-3fd0bb7307
Ubuntu 20.04 · curl · FIXED · 7.68.0-1ubuntu2.22
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "7.68.0-1ubuntu2.22" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · curl · FIXED · 7.81.0-1ubuntu1.16
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "7.81.0-1ubuntu1.16" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · curl · FIXED · 8.5.0-2ubuntu10.1
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "8.5.0-2ubuntu10.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.10 · curl · FIXED · 8.5.0-2ubuntu10.1
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "8.5.0-2ubuntu10.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 25.04 · curl · FIXED · 8.5.0-2ubuntu10.1
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "8.5.0-2ubuntu10.1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · curl · FIXED · 7.88.1-10+deb12u6
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "7.88.1-10+deb12u6" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · curl · FIXED · 8.7.1-1
sudo apt update && sudo apt install --only-upgrade curl
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "8.7.1-1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 8 · curl · FIXED · curl-7.61.1-34.el8_10.2
sudo dnf upgrade --advisory=RHSA-2024:5654
rpm -q curl
RHEL 9 · curl · FIXED · curl-7.76.1-29.el9_4.1
sudo dnf upgrade --advisory=RHSA-2024:5529
rpm -q curl
RHEL 9.2 Extended Update Support · curl · FIXED · curl-7.76.1-23.el9_2.7
sudo dnf upgrade --advisory=RHSA-2024:3998
rpm -q curl
RHEL 10 · curl · NOT AFFECTED
RHEL 6 · curl · DEFERRED
Alpine 3.20 · curl · FIXED · curl-8.7.1-r0
apk add --upgrade curl
apk info -v curl
Alpine 3.21 · curl · FIXED · curl-8.7.1-r0
apk add --upgrade curl
apk info -v curl
Alpine 3.22 · curl · FIXED · curl-8.7.1-r0
apk add --upgrade curl
apk info -v curl
Alpine 3.23 · curl · FIXED · curl-8.7.1-r0
apk add --upgrade curl
apk info -v curl
sudo dnf update --advisory=ALAS2023-2024-596
sudo yum update --advisory=ALAS2-2024-2526
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-2024-2398?
curl: upgrade to 8.7.0; macos: upgrade to 12.7.6, 13.6.8, 14.6; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2024-2398 being exploited?
CVE-2024-2398 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-2024-2398 affect?
CVE-2024-2398 affects curl, macos, fedora. Severity is high (CVSS 8.6). When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for the push surpasses the maximum allowed limit (1000), libcurl aborts the server push. When aborting, libcurl inadvertently does no
How urgent is CVE-2024-2398?
Priority 65/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action
Software pages
macOS vulnerabilities · curl vulnerabilities
Related CVEs
- CVE-2023-23915 MEDIUM 6.5 UPGRADE MITIGATE A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS
- CVE-2023-27534 HIGH 8.8 UPGRADE MITIGATE A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be
- CVE-2023-28319 HIGH 7.5 UPGRADE UPGRADE A use after free vulnerability exists in curl <v8.1.0 in the way libcurl offers a feature to verify an SSH ser
- CVE-2023-28321 MEDIUM 5.9 UPGRADE MITIGATE An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wil
- CVE-2022-43552 MEDIUM 5.9 UPGRADE UPGRADE A use after free vulnerability exists in curl <7.87.0