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HIGH

CVE-2026-76844

CVSS v3

7.4

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-17

CISA KEV

No

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

  • webpack-dev-middlewarenpmall versions · fixed in 7.4.6

Vendor advisories

  • CVE-2026-76844 Red Hat Product Security4 products fixed · 24 known affected

    webpack-dev-middleware: webpack-dev-middleware: Information Disclosure via Path Traversal

    workload-availability/node-healthcheck-must-gather-rhel9 as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-operator-bundle as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-rhel9-operator as a component of Node HealthCheck Operator

  • RHSA-2026:69296 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Data Grid 8.6.3 security update

  • RHSA-2026:68681 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.8.17 update

  • RHSA-2026:61783 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage

Full record on NVD

Description

zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
2026-08-24
Last Modified
2026-08-24

Frequently asked questions

What is CVE-2026-76844?

zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.

Is CVE-2026-76844 actively exploited?

Active exploitation of CVE-2026-76844 has not been confirmed. Its EPSS score was 0.6% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-76844?

CVE-2026-76844 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.

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