CRITICAL

CVE-2023-26136

Q: What is CVE-2023-26136?

Versions of the package tough-cookie before 4.1.3 are vulnerable to Prototype Pollution due to improper handling of Cookies when using CookieJar in rejectPublicSuffixes=false mode. This issue arises from the manner in which the objects are initialized.

Q: Is CVE-2023-26136 actively exploited?

Active exploitation of CVE-2023-26136 has not been confirmed. Its EPSS score was 2.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-26136?

CVE-2023-26136 has a CVSS v3 base score of 9.8 (CRITICAL severity).

CVSS v3

9.8

CRITICAL

EPSS Score

2.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

tough-cookienpmall versions · fixed in 4.1.3

Vendor advisories

CVE-2023-26136 Red Hat Product Security383 products fixed · 44 known affected
tough-cookie: prototype pollution in cookie memstore
mta/mta-ui-rhel9 as a component of Migration Toolkit for Applications 6 · tough-cookie.src as a component of Migration Toolkit for Runtimes · migration-toolkit-virtualization/mtv-ui-rhel8 as a component of Migration Toolkit for Virtualization
RHSA-2025:0323 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.14.13 Bug Fix Update
RHSA-2025:0164 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.15.9 Bug Fix Update
RHSA-2025:0082 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.16.5 Bug Fix Update
RHSA-2024:8676 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.17.0 Security, Enhancement, & Bug Fix Update
ICSA-24-200-02 CISA1 known affected
Subnet Solutions PowerSYSTEM Center
Subnet Solutions Inc. PowerSYSTEM Center 2020: <=Update_20

9 more advisories

Full record on NVD

Description

Versions of the package tough-cookie before 4.1.3 are vulnerable to Prototype Pollution due to improper handling of Cookies when using CookieJar in rejectPublicSuffixes=false mode. This issue arises from the manner in which the objects are initialized.

Technical details

Published: 2023-07-01

Frequently asked questions

What is CVE-2023-26136?

Is CVE-2023-26136 actively exploited?

Active exploitation of CVE-2023-26136 has not been confirmed. Its EPSS score was 2.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-26136?

CVE-2023-26136 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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