Autobahn Python permessage-deflate bypasses maxMessagePayloadSize after inflation
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| crossbario | autobahn-python | affected |
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| Crossbario | Autobahn-python |
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| Source | ID | Title |
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Github GHSA |
GHSA-hxp9-w8x3-p566 | Autobahn Python permessage-deflate bypasses maxMessagePayloadSize after inflation |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.524% probability within 30 days)
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ssvc
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| First Time appeared |
Crossbario
Crossbario autobahn-python |
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| Vendors & Products |
Crossbario
Crossbario autobahn-python |
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| Description | Autobahn Python is a WebSocket and WAMP implementation for Python that supports Twisted and asyncio. Prior to 26.7.1, WebSocket endpoints that accept permessage-deflate and rely on maxMessagePayloadSize enforce that limit against the compressed frame length before inflation but do not recheck the decompressed message size before delivery. A remote unauthenticated client can send a valid compressed frame below the configured wire-size limit that expands beyond the application message limit, causing oversized data to be allocated, joined, validated, and passed to application callbacks. This can create resource-exhaustion pressure, but the advisory does not establish confidentiality or integrity impact. This issue is fixed in version 26.7.1. | |
| Title | Autobahn Python permessage-deflate bypasses maxMessagePayloadSize after inflation | |
| Weaknesses | CWE-409 CWE-770 |
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| Metrics |
cvssV3_1
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