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.
CVE-2026-76844
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. A secondary CVSS source baseline 7.4; sources differ by 0.0.
Also known asEUVD-2026-64850 (ENISA EUVD) · GHSA-g84c-rxfj-3j2c (GitHub Security Advisories) · GHSA-p3f5-w63m-mxph (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.4
- EG Score
- 7.4HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity74% × 45%Impact severity (EG Severity): CVSS 7.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.6%
- EPSS %ILE
- 48th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.4): severity, escalated by confirmed exploitation. This CVE's 7.4 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.4 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
August 24, 2026
Last Modified
October 12, 2026
Advisory Details (4)
Auto-updated Aug 24, 2026webpack-dev-middleware Path Traversal via Offset Slice on a Non-Slash-Terminated publicPath | Advisories | VulnCheck
https://www.vulncheck.com/advisories/webpack-dev-middleware-path-traversal-via-offset-slice-on-a-non-slash-terminated-publicpathPath traversal in webpack-dev-middleware · CVE-2024-29180 · GitHub Advisory Database · GitHub
https://github.com/advisories/GHSA-wr3j-pwj9-hqq6webpack-dev-middleware/src/middleware.js at v8.1.1 · webpack/webpack-dev-middleware · GitHub
https://github.com/webpack/webpack-dev-middleware/blob/v8.1.1/src/middleware.jsGitHub - webpack/webpack-dev-middleware: A development middleware for webpack · GitHub
https://github.com/webpack/webpack-dev-middlewareVendor Advisories for CVE-2026-76844(6)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:92510Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI
- CVE-2026-76844Microsoft Security Response Center (MSRC)MediumMicrosoft CVSS 7.4
Microsoft security update for CVE-2026-76844
- GHSA-g84c-rxfj-3j2cGitHub Security AdvisoriesHigh
webpack-dev-middleware vulnerable to Path Traversal via non-slash-terminated publicPath
- RHSA-2026:69296Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Data Grid 8.6.3 security update
- RHSA-2026:68681Red Hat Product SecurityHigh
Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.8.17 update
- RHSA-2026:61783Red Hat Product SecurityHigh
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
Patch Availability(6)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | rhoai/odh-feature-server-rhel9:1792685074 | 2026-10-29 | redhat |
| redhat | redhat-datagrid-maven-repository.zip | 2026-09-21 | redhat |
| redhat | rhmtc/openshift-migration-ui-rhel8:1789546373 | 2026-09-17 | redhat |
| redhat | discovery/discovery-ui-rhel9:1788206196 | 2026-08-31 | redhat |
| npm | webpack-dev-middleware @ 8.3.0 (fixes >= 8.0.0, < 8.3.0) | — | ghsa |
| npm | webpack-dev-middleware @ 7.4.6 (fixes < 7.4.5) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(4 across 4 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| zlib | 1:1.2.13.dfsg-1 ... 1:1.3.dfsg-3.1~exp1 (15 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| zlib | 1:1.3.dfsg+really1.3.1-1 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| zlib | 1:1.3.dfsg+really1.3.1-1 ... 1:1.3.dfsg+really1.3.2-3 (6 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| webpack-dev-middleware | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 38× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.
Showing the most recent 100 of 277 rows on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 177 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-11 11:42 UTCEchelonGraph re-scored
- 2026-11-11 11:42 UTCVendor advisory
- 2026-11-11 11:42 UTCGHSA enrichmentGHSA-g84c-rxfj-3j2c · GitHub severity HIGH · GitHub CVSS 7.4
- 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-04 21:19 UTCEchelonGraph re-scored
- 2026-11-04 21:19 UTCVendor advisory
- 2026-11-04 21:19 UTCGHSA enrichmentGHSA-g84c-rxfj-3j2c · GitHub severity HIGH · GitHub CVSS 7.4
- 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-01 07:39 UTCGHSA enrichmentGHSA-g84c-rxfj-3j2c · GitHub severity HIGH · GitHub CVSS 7.4
- 2026-11-01 07:39 UTCEchelonGraph re-scored
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-29 06:55 UTCEchelonGraph re-scored
- 2026-10-29 06:55 UTCVendor advisory
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- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-25 14:01 UTCEchelonGraph re-scored
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-22 11:27 UTCEchelonGraph re-scored
- 2026-10-22 11:27 UTCVendor advisory
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-19 08:51 UTCEchelonGraph re-scored
- 2026-10-19 08:51 UTCVendor advisory
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-18 03:12 UTCEchelonGraph re-scored
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-12 17:25 UTCEchelonGraph re-scored
- 2026-10-12 17:25 UTCVendor advisory
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-12 15:38 UTCEchelonGraph re-scored
- 2026-10-11 19:23 UTCEchelonGraph re-scored
- 2026-10-11 16:39 UTCEchelonGraph re-scored
- 2026-10-11 13:58 UTCEchelonGraph re-scored
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-10 13:00 UTCEchelonGraph re-scored
- 2026-10-10 13:00 UTCVendor advisory
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-09 04:58 UTCEchelonGraph re-scored
- 2026-10-09 04:58 UTCVendor advisory
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-08 04:02 UTCEchelonGraph re-scored
- 2026-10-08 04:02 UTCVendor advisory
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-07 05:41 UTCVendor advisory
- 2026-10-06 16:40 UTCEchelonGraph re-scored
- 2026-10-06 16:40 UTCVendor advisory
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-06 02:53 UTCEchelonGraph re-scored
- 2026-10-06 02:53 UTCVendor advisory
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-05 09:44 UTCEchelonGraph re-scored
- 2026-10-05 09:44 UTCVendor advisory
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-04 20:43 UTCVendor advisory
- 2026-10-04 06:16 UTCVendor advisory
- 2026-10-03 17:15 UTCEchelonGraph re-scored
- 2026-10-03 17:15 UTCVendor advisory
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-03 04:08 UTCEchelonGraph re-scored
- 2026-10-03 04:08 UTCVendor advisory
- 2026-10-02 14:49 UTCVendor advisory
- 2026-10-02 01:29 UTCEchelonGraph re-scored
- 2026-10-02 01:29 UTCVendor advisory
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-01 12:28 UTCEchelonGraph re-scored
- 2026-10-01 12:28 UTCVendor advisory
- 2026-10-01 11:21 UTCVendor advisory
- 2026-10-01 10:56 UTCEchelonGraph re-scored
- 2026-10-01 10:56 UTCVendor advisory
- 2026-10-01 09:19 UTCVendor advisory
- 2026-09-30 20:19 UTCEchelonGraph re-scored
- 2026-09-30 20:19 UTCVendor advisory
- 2026-09-30 07:15 UTCEchelonGraph re-scored
- 2026-09-30 07:15 UTCVendor advisory
- 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-09-29 15:15 UTCVendor advisory
- 2026-09-29 15:15 UTCGHSA enrichmentGHSA-p3f5-w63m-mxph · GitHub severity HIGH · GitHub CVSS 7.4
- 2026-09-28 21:33 UTCEchelonGraph re-scored
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownnpm:webpack-dev-middleware · Debian:12:zlib
- CVE-2024-29180EG 7.4HIGH
- CVE-2026-22184NVD 7.8EG 9.8CRITICAL
- CVE-2023-45853EG 9.8CRITICAL
- CVE-2022-37434EG 9.8EPSS p97CRITICAL
- CVE-2016-9843EG 9.8EPSS p93CRITICAL
- CVE-2016-9841EG 9.8EPSS p95CRITICAL
- CVE-2016-9842EG 8.8EPSS p93HIGH
- CVE-2016-9840EG 8.8EPSS p92HIGH
- CVE-2018-25032NVD 7.5EG 8.1EPSS p99HIGH
- CVE-2005-2096EG 7.5EPSS p93HIGH
Same vendor
10 shownredhat:RHSA-2026:61783 · redhat:RHSA-2026:68681
Frequently asked(5)
What is CVE-2026-76844?
When was the CVE record for CVE-2026-76844 published?
Is CVE-2026-76844 actively exploited?
What is the CVSS score of CVE-2026-76844?
How do I remediate CVE-2026-76844?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-76844
Is Your Infrastructure Affected by CVE-2026-76844?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.