CVE-2024-53924: Pycel through 1.0b30, when operating on an untrusted spreadsheet, allows code execution via a crafted formula

Q: How do I fix CVE-2024-53924?

pycel: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2024-53924 being exploited?

CVE-2024-53924 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-53924 affect?

CVE-2024-53924 affects pycel. Severity is critical (CVSS 9.8). Pycel through 1.0b30, when operating on an untrusted spreadsheet, allows code execution via a crafted formula in a cell, such as one beginning with the =IF(A1=200, eval("__import__('os').system( substring.

Q: How urgent is CVE-2024-53924?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2024-53924 is a critical-severity flaw (CVSS 9.8) affecting pycel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pycel through 1.0b30, when operating on an untrusted spreadsheet, allows code execution via a crafted formula in a cell, such as one beginning with the =IF(A1=200, eval("__import__('os').system( substring.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-94
Published	2025-04-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dgorissen

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-17 18:15 UTCPublished CVE record published
2026-06-17 08:09 UTCUpdated Record last modified

dgorissen pycel DOWNGRADE

Affected: 1.0 beta0 · 1.0 beta11 · 1.0 beta12 · 1.0 beta13 · 1.0 beta14 · 1.0 beta15 · 1.0 beta16 · 1.0 beta17

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

pip show pycel

2. No fixed release: DOWNGRADE to a release before 1.0

pip index versions pycel pip install "pycel<1.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-53924?

pycel: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-53924 being exploited?

CVE-2024-53924 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-53924 affect?

CVE-2024-53924 affects pycel. Severity is critical (CVSS 9.8). Pycel through 1.0b30, when operating on an untrusted spreadsheet, allows code execution via a crafted formula in a cell, such as one beginning with the =IF(A1=200, eval("__import__('os').system( substring.

How urgent is CVE-2024-53924?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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