Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling)
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| http4s | http4s | affected |
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| Source | ID | Title |
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Github GHSA |
GHSA-9998-894r-fwvr | Http4s Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling) |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.480% probability within 30 days)
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| First Time appeared |
Http4s
Http4s http4s |
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| Vendors & Products |
Http4s
Http4s http4s |
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| Metrics |
ssvc
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| Description | Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive substring test for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunked are incorrectly accepted, and Unicode case folding can turn a Kelvin-sign byte sequence into a match when UTF-8 is used. Intermediaries that apply RFC-compliant token and charset rules can therefore disagree with Ember’s Content-Length or zero-length framing, enabling TE.CL or TE.0 request smuggling, access-control bypass, cross-user request hijacking, and cache poisoning on the server path. Response smuggling through an ember-client gateway requires a malicious or compromised upstream. This issue is fixed in versions 0.23.35 and 1.0.0-M47. | |
| Title | Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling) | |
| Weaknesses | CWE-444 | |
| References |
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| Metrics |
cvssV3_1
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