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Fencer Vulns
high 8.1

CVE-2019-11922 json

A race condition in the one-pass compression functions of Zstandard prior to version 1.3.8 could allow an attacker to write bytes out of bo…

published 2019-07-25 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3580

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

A race condition in the one-pass compression functions of Zstandard prior to version 1.3.8 could allow an attacker to write bytes out of bounds if an output buffer smaller than the recommended size was used.

Patch / fix

  • Facebook Zstandard 1.3.8
  • libzstd Debian 14, Debian 13, Debian 12 1.3.8+dfsg-2

debian advisories DEBIAN-CVE-2019-11922

  • libzstd Ubuntu 18.04 LTS 1.3.3+dfsg-2ubuntu1.1
  • libzstd Ubuntu Pro 16.04 LTS 1.3.1+dfsg-1~ubuntu0.16.04.1+esm2

ubuntu advisories UBUNTU-CVE-2019-11922

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zstd openSUSE Tumbleweed 1.5.0-1.13
  • zstd Package Hub 15 SP1, Package Hub 15 1.4.2-bp151.4.3.1
  • zstd openSUSE Leap 15.0 1.4.2-lp150.2.3.1
  • zstd openSUSE Leap 15.1 1.4.2-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:11544-1openSUSE-SU-2019:2008-1openSUSE-SU-2019:1952-1openSUSE-SU-2019:1845-1

  • zstd Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 1.3.8-r0

alpine advisories ALPINE-CVE-2019-11922

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-11922 updated cvss 8.1

zstd: race condition in one-pass compression functions that could allow out of bounds write

  • Red Hat Enterprise Linux 8 zstd, mecab, mysql, libzstd, mysql-libs, mysql-test, +6 more Red Hat Enterprise Linux 9 zstd, libzstd Red Hat Software Collections rh-mysql80-mysql, rh-mysql80-mysql-test, rh-mysql80-mysql-common, rh-mysql80-mysql-config, rh-mysql80-mysql-errmsg, rh-mysql80-mysql-server, +4 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.42% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Facebook Zstandard

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.