CVE-2026-119434: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in silviucpp ezstd allows an at

Routine

MEDIUM 6.9UPGRADE

CVE-2026-119434 is a medium-severity flaw (CVSS 6.9) affecting ezstd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in silviucpp ezstd allows an attacker who supplies a zstd frame to ezstd:decompress_using_ddict/2 to exhaust memory and terminate the Erlang VM via a small frame that declares a very large content size. zstd_nif_decompress_using_ddict in c_src/ezstd_nif.cc reads the frame's declared content size with ZSTD_getFrameContentSize and passes it directly to enif_make_new_bin

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.9 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-409
Published	2026-11-05
Last modified	2026-11-05

Publisher (CNA): EEF · Vendor: silviucpp · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-05 20:15 UTCPublished CVE record published
2026-11-05 20:15 UTCUpdated Record last modified

silviucpp ezstd UPGRADE

Affected: >= 1.0.5 and < 1.2.5

Fixed in: 1.2.5

Safe to downgrade to: a release before 1.0.5

1. Check installed version

apt-cache policy ezstd || rpm -q ezstd || ezstd --version

2. UPGRADE to 1.2.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ezstd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ezstd

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 1.0.5 (Debian / Ubuntu)

apt-cache madison ezstd sudo apt install ezstd=<VERSION_BEFORE_1.0.5> sudo apt-mark hold ezstd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ezstd sudo dnf downgrade ezstd-<VERSION_BEFORE_1.0.5> sudo dnf versionlock add ezstd

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-2026-119434?

ezstd: upgrade to 1.2.5. Exact commands for each OS are on this page.

Is CVE-2026-119434 being exploited?

CVE-2026-119434 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-2026-119434 affect?

CVE-2026-119434 affects ezstd. Severity is medium (CVSS 6.9). Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in silviucpp ezstd allows an attacker who supplies a zstd frame to ezstd:decompress_using_ddict/2 to exhaust memory and terminate the Erlang VM via a small frame

How urgent is CVE-2026-119434?

Priority 24/100. No elevated risk signals yet.

References

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