Home/CVE/BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.
CVE

CVE-2019-12900

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

CRITICAL · CVSS 9.8 EPSS 0.01111
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

9
bzip bzip2<= 1.0.6
debian linuxall versions
opensuse leapall versions
canonical ubuntu linuxall versions
freebsdall versions
python>= 3.7.0 and < 3.7.13
python>= 3.8.0 and < 3.8.13
python>= 3.9.0 and < 3.9.11
⚠

Public Exploits & PoCs

2
pocpacketstormsecurity.com · Slackware-Security-Advisory-bzip2-Updates.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · FreeBSD-Security-Advisory-FreeBSD-SA-19-18.bzip2.htmlpacketstormsecurity.com
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighPython Reverse Shell Execution Via PTY And Socket Modules
producthighInline Python Execution - Spawn Shell Via OS System Library
producthighPython One-Liners with Base64 Decoding - Linux
producthighPython Function Execution Security Warning Disabled In Excel
producthighPython One-Liners with Base64 Decoding
producthighPython Spawning Pretty TTY on Windows
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Jun 2019 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
siemens-csafSSA-202008
rhsaRHSA-2025:1154Moderate
rhsaRHSA-2025:0925Moderate
rhsaRHSA-2024:10803Moderate
rhsaRHSA-2025:0733Moderate
🔗

References & Sources

21
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00040.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00050.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00078.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00000.htmlMailing ListThird Party Advisory
https://gitlab.com/federicomenaquintero/bzip2/commit/74de1e2e6ffc9d51ef9824db71a8ffee5962cdbcPatchVendor Advisory
https://lists.apache.org/thread.html/ra0adb9653c7de9539b93cc8434143b655f753b9f60580ff260becb2b%40%3Cusers.kafka.apache.org%3E
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