9.8

CVE-2026-39892: cryptography has a buffer overflow if non-contiguous buffers were passed to APIs

Modified
AliasesALPINE-CVE-2026-39892GHSA-p423-j2cm-9vmqPYSEC-2026-36
Published 08-04-2026Last modified 10-09-2026

Vulnerability summary

CVE-2026-39892 is a critical (CVSS 9.8) vulnerability in cryptography.io cryptography. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 51.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.65%
0%100%
Low · -0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
RHSA-2026:24761RHSA-2026:24762RHSA-2026:7295CGA-9C4C-5H22-FV67

Timeline

  1. 08-04-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.

CVSS metrics

9 scores · 7 sources · 2 versions

EPSS trend

Probability

0.65%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

Decrease -0.11 pp

From 0.76% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard59 products
  • airflow-2< 2.11.2-r8
  • airflow-3< 3.2.0-r1
  • airflow-core-2< 2.11.2-r5
  • airflow-core-3< 3.2.0-r2
  • apache-beam-python-3.11-sdk< 2.73.0-r6
Wolfi21 products
  • airflow-3< 3.2.0-r1
  • dask-kubernetes< 2026.3.0-r3
  • datadog-agent-7.72-core-integrations< 7.72.4-r27
  • datadog-agent-7.73-core-integrations< 7.73.3-r23
  • datadog-agent-7.74-core-integrations< 7.74.1-r19
Alpine1 product
  • py3-cryptography≥ 45.0.0, < 46.0.7-r0
Cryptography.io1 product
Debian1 product
  • python-cryptography< 46.0.7-1
Opensuse1 product
  • python-cryptography&distro=openSUSE Tumbleweed< 46.0.7-1.1
Pyca1 product
PyPI1 product
  • cryptography≥ 45.0.0, < 46.0.7

8 vendors · 86 products

References

37 links
Show all 37 references