Answer in brief
CVE-2024-29180 records a High severity (CVSS 8.3) vulnerability in zlib 1.2.11 through 1.3.2 Heap Buffer Overflow via Stale gzwrite Pointer After Failed Write. The current sources do not mark it as known exploited. The current feed maps webpack/webpack-dev-middleware (generic), webpack/webpack-dev-middleware (generic), zlib/zlib (generic), webpack-dev-middleware (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps webpack/webpack-dev-middleware (generic), webpack/webpack-dev-middleware (generic), zlib/zlib (generic), webpack-dev-middleware (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| webpack/webpack-dev-middlewaregeneric | 5.3.4 || 6.1.2 || 7.1.0 || 8.0.0 | Not reported |
| webpack/webpack-dev-middlewaregeneric | >=5.3.4 <=5.3.4 || >=6.1.2 <=6.1.3 || >=7.1.0 <7.4.6 || >=8.0.0 <8.3.0 | 7.4.6, 8.3.0 |
| zlib/zlibgeneric | >=1.2.11 <=1.3.2 | Not reported |
| webpack-dev-middlewarenpm | >=8.0.0,<8.3.0 | 8.3.0 |
| webpack-dev-middlewarenpm | <7.4.5 | 7.4.6 |
| webpack-dev-middlewarenpm | >=8.0.0 <8.3.0 | 8.3.0 |
| webpack-dev-middlewarenpm | >=0 <7.4.6 | 7.4.6 |
| webpack-dev-middlewarenpm | >=7.0.0 <7.1.0 | 7.1.0 |
| webpack-dev-middlewarenpm | >=6.0.0 <6.1.2 | 6.1.2 |
| webpack-dev-middlewarenpm | >=0 <5.3.4 | 5.3.4 |
Published upstream
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.