7.1

CVE-2026-4786: Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

Awaiting analysis
AliasesALPINE-CVE-2026-4786RHSA-2026:19589RHSA-2026:22144
Published 13-04-2026Last modified 13-08-2026

Vulnerability summary

CVE-2026-4786 is a high (CVSS 7.1) vulnerability in python software foundation cpython. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · -0.20 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 59 · Related 26
MGASA-2026-0455OPENSUSE-SU-2026:10647-1OPENSUSE-SU-2026:10648-1OPENSUSE-SU-2026:10667-1OPENSUSE-SU-2026:11068-1OPENSUSE-SU-2026:11100-1

Timeline

  1. 13-04-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

CVSS metrics

11 scores · 8 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Decrease -0.20 pp

From 0.48% 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: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat16 products
  • python< 0:2.7.5-94.el7_9.5 | < 0:2.6.6-70.el6_10.4
  • python-debug< 0:2.7.5-94.el7_9.5
  • python-debuginfo< 0:2.7.5-94.el7_9.5 | < 0:2.6.6-70.el6_10.4
  • python-devel< 0:2.7.5-94.el7_9.5 | < 0:2.6.6-70.el6_10.4
  • python-libs< 0:2.7.5-94.el7_9.5 | < 0:2.6.6-70.el6_10.4
Ubuntu14 products
  • jythonAll versions (No fix recorded)
  • pypy3All versions (No fix recorded)
  • python2.7All versions (No fix recorded)
  • python3.10< 3.10.12-1~22.04.16
  • python3.11All versions (No fix recorded)
Chainguard6 products
  • python-3.10< 3.10.20-r3
  • python-3.11< 3.11.15-r2
  • python-3.12< 3.12.14-r2
  • python-3.13< 3.13.13-r2
  • python-3.14< 3.14.4-r3
Wolfi5 products
  • python-3.10< 3.10.20-r3
  • python-3.11< 3.11.15-r2
  • python-3.12< 3.12.14-r2
  • python-3.13< 3.13.13-r2
  • python-3.14< 3.14.4-r3
Debian3 products
  • pypy3< 7.3.22+dfsg-1
  • python3.13< 3.13.14-1
  • python3.14< 3.14.5-1
Alpine1 product
  • python3< 3.12.14-r0
Python software foundation1 product
  • cpython< 3.10.21 | ≥ 3.11.0, < 3.11.16 | ≥ 3.12.0, < 3.12.14 | ≥ 3.13.0, < 3.13.14 | ≥ 3.14.0a1, < 3.14.5rc1 | ≥ 3.15.0a1, < 3.15.0b1

7 vendors · 46 products

References

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