A string is decoded through a fixed-size buffer (16 KiB in 4.04), and each time the buffer fills its contents move into a new scalar. Nothing frees that scalar when the string is then rejected for a control character, an invalid escape, malformed UTF-8 or the end of the input.
A process that keeps running after a failed decode retains the decoded part of each rejected string, with its size chosen by the sender. Repeated requests exhaust process memory.
Analysis
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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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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 leak the decoded part of a rejected long string in decode_str. A string is decoded through a fixed-size buffer (16 KiB in 4.04), and each time the buffer fills its contents move into a new scalar. Nothing frees that scalar when the string is then rejected for a control character, an invalid escape, malformed UTF-8 or the end of the input. A process that keeps running after a failed decode retains the decoded part of each rejected string, with its size chosen by the sender. Repeated requests exhaust process memory. | |
| Title | JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str | |
| Weaknesses | CWE-401 | |
| References |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-11-14T11:53:12.301Z
Reserved: 2026-11-08T12:32:39.559Z
Link: CVE-2026-124541
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-14T12:17:43.777
Modified: 2026-11-14T12:17:43.777
Link: CVE-2026-124541
Redhat
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OpenCVE Enrichment
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