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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| unaffected |
|
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No data available yet.
Vendor Solution
Upgrade to JSON-XS 4.05 or later.
Tracking
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| Link | Providers |
|---|---|
| https://metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes |
|
Sat, 14 Nov 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | 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 | |
| Weaknesses | CWE-770 | |
| References |
|
Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-11-14T11:51:22.977Z
Reserved: 2026-11-08T12:31:51.297Z
Link: CVE-2026-124536
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-14T12:17:42.840
Modified: 2026-11-14T12:17:42.840
Link: CVE-2026-124536
Redhat
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OpenCVE Enrichment
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