CVE-2023-33733Public exploit

Arbitrary code execution via toColor sandbox bypass

Published Jun 5, 2023 · Updated Jan 8, 2025

Code injection in ReportLab 3.6.12 and earlier allows attackers to execute arbitrary code through hostile input passed to toColor. The rl_safe_eval blacklist accepts a crafted str subclass whose mutable comparisons bypass forbidden-name checks, exposing function globals and the os module. Exploitation requires an application to pass attacker-controlled color expressions, such as HTML markup submitted for PDF generation, and runs code with that application's privileges.

CVSS severity7.8
High
EPSS probability2.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in ReportLab 3.6.12 and earlier allows attackers to execute arbitrary code through hostile input passed to toColor. The rl_safe_eval blacklist accepts a crafted str subclass whose mutable comparisons bypass forbidden-name checks, exposing function globals and the os module. Exploitation requires an application to pass attacker-controlled color expressions, such as HTML markup submitted for PDF generation, and runs code with that application's privileges.

The record

CVE
CVE-2023-33733
Published
Jun 5, 2023
Updated
Jan 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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