Security fix · CVE-2025-49823

(conda) Constructor is a tool which allows constructing an installer for a collection of conda packages.

Q: Which versions are affected?

Compare what you have installed with conda constructor < 3.11.3 < 3.11.3. Compare the installed version with the linked vendor advisory before you change production.

Q: What should an analyst verify?

No weakness class is stored. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Published Jun 17, 2025 · catalog updated Jun 17, 2025 · (conda) Constructor is a

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-49823. EPSS is 0.16%. Act only if a listed version of (conda) Constructor is a is installed.

Gaps on this record

The stored product name is a package slug. The name on this page is taken from the title ((conda) Constructor is a).
No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

CVE-2025-64343 · High
CVE-2025-9194 · Medium

Severity: None0.0
Known exploitation: Not in CISA/VulnCheck KEV
EPSS: 0.16%
Remediation: Version ranges on file
Affected products: vendor conda constructor < 3.11.3

(conda) Constructor is a tool which allows constructing an installer for a collection of conda packages. Prior to version 3.11.3, shell installer scripts process the installation prefix (user_prefix) using an eval statement, which executes unsanitized user input as shell code. Although the script runs with user privileges (not root), an attacker could exploit this by injecting arbitrary commands through a malicious path during installation. Exploitation requires explicit user action. This issue has been patched in version 3.11.3.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

vendor conda constructor < 3.11.3< 3.11.3

How to fix CVE-2025-49823

Upgrade
CVE-2025-49823 lists a fix boundary at 3.11.3. Compare the installed build with that boundary before you change production.
Version check
Affected < 3.11.3
Advisory
Open the cve_org record and follow its fix.
Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-49823. EPSS is 0.16%. Act only if a listed version of (conda) Constructor is a is installed.

Which versions are affected?

Compare what you have installed with conda constructor < 3.11.3 < 3.11.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Repository · github.com

Timeline

Detection, updates, and resolution for this record.

Jun 17, 2025 · EUVD
Detected
(conda) Constructor is a tool which allows constructing an installer for a collection of conda packages. Prior to version 3.11.3, shell installer scripts process the installation prefix (user_prefix) using an eval statement, which executes unsanitized user input as shell code. Although the script runs with user privileges (not root), an attacker could exploit this by injecting arbitrary commands t
Jun 17, 2025 · EUVD
Updated
(conda) Constructor is a tool which allows constructing an installer for a collection of conda packages. Prior to version 3.11.3, shell installer scripts process the installation prefix (user_prefix) using an eval statement, which executes unsanitized user input as shell code. Although the script runs with user privileges (not root), an attacker could exploit this by injecting arbitrary commands t

Sources

CVE.orgVulnerability recordCVE-2025-49823
Official CVE identifier
cve.org
FIRST EPSSExploitation probabilityCVE-2025-49823
30-day exploitation probability 0.16%
first.org
EUVDVulnerability recordEUVD-2025-18445
(conda) Constructor is a tool which allows constructing an installer for a collection of conda packages. Prior to version 3.11.3, shell installer scripts process the installation prefix (user_prefix) using an eval statement, which executes unsanitized user input as shell code. Al
euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

FIRST EPSSOct 23, 2026
CVE.orgOct 21, 2026
EUVDOct 20, 2026

Priority score

1/100

Evidence confidence: High

A vendor or government advisory agrees with at least one other source.

Confirmed exploitation0/30
EPSS probability1/20
CVSS severity0/15
Public exploit0/10
Internet exposure0/10
Product prevalence0/5
Detection0/5
Threat research0/5

Decision signals

Four separate signals — do not infer one from another.

None

CVSS severity
0.0 v3.1
Technical impact. Separate from exploitation likelihood.
CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:N/I:N/A:N
EPSS probability
0.16% · p4.95%
Estimated probability of exploitation within 30 days (FIRST).
Known exploitation
No verified KEV listing
Evidence from CISA KEV or VulnCheck KEV only — not from EPSS alone.
Patch availability
Version ranges on file
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

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