Answer in brief
CVE-2026-124536 records a Unknown severity vulnerability in JSON::XS versions before 4.05 for Perl allow memory exhaustion by buffering incremental input past max_size after a NUL byte in incr_parse. The current sources do not mark it as known exploited. The current feed maps JSON-XS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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 JSON-XS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| JSON-XSgeneric | >=0 <4.05 | 4.05 |
Published upstream
Nov 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 14, 2026
JSON::XS versions before 4.05 for Perl allow memory exhaustion by buffering incremental input past max_size after a NUL byte in incr_parse. The parser appends each chunk to its buffer and compares max_size with how far it has progressed, not with the buffer length. It treats a NUL byte as the end of the input, so a NUL within the first max_size bytes keeps it short of the limit. The buffer keeps growing, and incr_skip cannot remove the NUL. A peer streaming data to an incr_parse consumer can exhaust process memory regardless of max_size.
Quoted source text, attributed separately from HOL analysis.