CVE-2026-6100

216.73.217.22

· Published 13/04/2026 18:16 · Modified 14/04/2026 15:16

Labels: CVE-2026-6100 2026-04-13 CVE-2026-6100 CWE-416 [email protected]

Essential information

Published: 13/04/2026 18:16
Modified: 14/04/2026 15:16
Author: —
Creator: —
CVSS: 9.1 CRITICAL (v3) 9.1 CRITICAL (v4.0)
CISA KEV: No
CWE: —
CVSS vector: —

CVSS metrics

Description

Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.

NVD status

Status: Received — CVE has been recently published to the CVE List and has been received by the NVD.
Source: [email protected]
NVD: View on NVD

Affected products (CPE)

Product	CPE
python / lzma	`cpe:2.3:a:python:lzma::::::::`
python / bz2	`cpe:2.3:a:python:bz2::::::::`
python / gzip	`cpe:2.3:a:python:gzip::::::::`