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CVE-2026-71558: Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ vers

63
This week
CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-71558 is a critical-severity flaw (CVSS 9.8) affecting fory. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from 0.14.0 before 1.5.0. A crafted input payload can bypass type compatibility checks during polymorphic smart-pointer deserialization, causing an object of an incompatible type to be treated as the declared base type. This may result in undefined behavior and potentially lead to denial of service or arbitrary code execution. User

Why this priority

  • Critical severity
  • CISA SSVC: automatable with total technical impact
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 38%)
CISA exploited listNo
WeaknessCWE-502, CWE-843
Published2026-08-07
Last modified2026-10-23
Publisher (CNA): Apache Software Foundation · Vendor: apache

Am I affected?

Timeline

apache fory UPGRADE
Affected: >= 0.14.0 and < 1.5.0
Fixed in: 1.5.0
Safe to downgrade to: a release before 0.14.0
1. Check installed version
apt-cache policy fory || rpm -q fory || fory --version
2. UPGRADE to 1.5.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fory
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fory
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 0.14.0 (Debian / Ubuntu)
apt-cache madison fory sudo apt install fory=<VERSION_BEFORE_0.14.0> sudo apt-mark hold fory
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fory sudo dnf downgrade fory-<VERSION_BEFORE_0.14.0> sudo dnf versionlock add fory
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.

Exact fixes by distribution

Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
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.

Quick answers

How do I fix CVE-2026-71558?

fory: upgrade to 1.5.0. Exact commands for each OS are on this page.

Is CVE-2026-71558 being exploited?

CVE-2026-71558 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-2026-71558 affect?

CVE-2026-71558 affects fory. Severity is critical (CVSS 9.8). Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from 0.14.0 before 1.5.0. A crafted input payload can bypass type compatibility checks during polymorphic smart-pointer deser

How urgent is CVE-2026-71558?

Priority 63/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

References

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