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CVE-2026-9669

35
FAUCET Score

bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data.

First published: Jun 8, 2026Last modified: Jul 7, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 3.13.14CPE match
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
>= 3.14.0, < 3.14.6CPE match
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 9th percentile among its peer group of 8,915 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

ubuntupatch availablevia ubuntu_usn
Product: python3.10 (jammy)Fixed in: 3.10.12-1~22.04.16
ubuntupatch availablevia ubuntu_usn
Product: python3.12 (noble)Fixed in: 3.12.3-1ubuntu0.15
ubuntupatch availablevia ubuntu_usn
Product: python3.14 (resolute)Fixed in: 3.14.4-1ubuntu0.1

Vendor Advisories (2)

ubuntuUSN-8509-1

Python vulnerabilities

Jul 6, 2026
microsoft2026-Jun/CVE-2026-9669Moderate

bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow

Jun 9, 2026

References

openwall.com / lists/oss-security/2026/06/08/17
github.com / python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6
github.com / python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e
github.com / python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f
github.com / python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79
github.com / python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d
github.com / python/cpython/issues/150599
github.com / python/cpython/pull/150600
mail.python.org / archives/list/[email protected]/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX