CVE-2018-13443: EOS.IO jit-wasm 4.1 has a heap-based buffer overflow via a crafted wast file.

This month

HIGH 8.8DOWNGRADE

CVE-2018-13443 is a high-severity flaw (CVSS 8.8) affecting jit-wasm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

EOS.IO jit-wasm 4.1 has a heap-based buffer overflow via a crafted wast file.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-04-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: block

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-04-24 15:29 UTCPublished CVE record published
2026-06-17 01:39 UTCUpdated Record last modified

block jit-wasm DOWNGRADE

Affected: 4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1

1. Check installed version

apt-cache policy jit-wasm || rpm -q jit-wasm || jit-wasm --version

2. No fixed release: DOWNGRADE to a release before 4.1 (Debian / Ubuntu)

apt-cache madison jit-wasm sudo apt install jit-wasm=<VERSION_BEFORE_4.1> sudo apt-mark hold jit-wasm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jit-wasm sudo dnf downgrade jit-wasm-<VERSION_BEFORE_4.1> sudo dnf versionlock add jit-wasm

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.

Quick answers

How do I fix CVE-2018-13443?

jit-wasm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-13443 being exploited?

CVE-2018-13443 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-2018-13443 affect?

CVE-2018-13443 affects jit-wasm. Severity is high (CVSS 8.8). EOS.IO jit-wasm 4.1 has a heap-based buffer overflow via a crafted wast file.

How urgent is CVE-2018-13443?

Priority 56/100. High severity; Public exploit reference

References

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