CVE-2026-6608 (GCVE-0-2026-6608)
Vulnerability from cvelistv5 – Published: 2026-04-20 05:15 – Updated: 2026-04-20 05:15
VLAI?
Title
lm-sys fastchat Arena Side-by-Side View add_text control flow
Summary
A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed.
Severity ?
CWE
- CWE-670 - Incorrect Control Flow
Assigner
References
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Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| lm-sys | fastchat |
Affected:
0.2.0
Affected: 0.2.1 Affected: 0.2.2 Affected: 0.2.3 Affected: 0.2.4 Affected: 0.2.5 Affected: 0.2.6 Affected: 0.2.7 Affected: 0.2.8 Affected: 0.2.9 Affected: 0.2.10 Affected: 0.2.11 Affected: 0.2.12 Affected: 0.2.13 Affected: 0.2.14 Affected: 0.2.15 Affected: 0.2.16 Affected: 0.2.17 Affected: 0.2.18 Affected: 0.2.19 Affected: 0.2.20 Affected: 0.2.21 Affected: 0.2.22 Affected: 0.2.23 Affected: 0.2.24 Affected: 0.2.25 Affected: 0.2.26 Affected: 0.2.27 Affected: 0.2.28 Affected: 0.2.29 Affected: 0.2.30 Affected: 0.2.31 Affected: 0.2.32 Affected: 0.2.33 Affected: 0.2.34 Affected: 0.2.35 Affected: 0.2.36 cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:* |
Credits
{
"containers": {
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*"
],
"modules": [
"Arena Side-by-Side View Handler"
],
"product": "fastchat",
"vendor": "lm-sys",
"versions": [
{
"status": "affected",
"version": "0.2.0"
},
{
"status": "affected",
"version": "0.2.1"
},
{
"status": "affected",
"version": "0.2.2"
},
{
"status": "affected",
"version": "0.2.3"
},
{
"status": "affected",
"version": "0.2.4"
},
{
"status": "affected",
"version": "0.2.5"
},
{
"status": "affected",
"version": "0.2.6"
},
{
"status": "affected",
"version": "0.2.7"
},
{
"status": "affected",
"version": "0.2.8"
},
{
"status": "affected",
"version": "0.2.9"
},
{
"status": "affected",
"version": "0.2.10"
},
{
"status": "affected",
"version": "0.2.11"
},
{
"status": "affected",
"version": "0.2.12"
},
{
"status": "affected",
"version": "0.2.13"
},
{
"status": "affected",
"version": "0.2.14"
},
{
"status": "affected",
"version": "0.2.15"
},
{
"status": "affected",
"version": "0.2.16"
},
{
"status": "affected",
"version": "0.2.17"
},
{
"status": "affected",
"version": "0.2.18"
},
{
"status": "affected",
"version": "0.2.19"
},
{
"status": "affected",
"version": "0.2.20"
},
{
"status": "affected",
"version": "0.2.21"
},
{
"status": "affected",
"version": "0.2.22"
},
{
"status": "affected",
"version": "0.2.23"
},
{
"status": "affected",
"version": "0.2.24"
},
{
"status": "affected",
"version": "0.2.25"
},
{
"status": "affected",
"version": "0.2.26"
},
{
"status": "affected",
"version": "0.2.27"
},
{
"status": "affected",
"version": "0.2.28"
},
{
"status": "affected",
"version": "0.2.29"
},
{
"status": "affected",
"version": "0.2.30"
},
{
"status": "affected",
"version": "0.2.31"
},
{
"status": "affected",
"version": "0.2.32"
},
{
"status": "affected",
"version": "0.2.33"
},
{
"status": "affected",
"version": "0.2.34"
},
{
"status": "affected",
"version": "0.2.35"
},
{
"status": "affected",
"version": "0.2.36"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Eric-f (VulDB User)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed."
}
],
"metrics": [
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"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
"version": "4.0"
}
},
{
"cvssV3_1": {
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"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R",
"version": "3.1"
}
},
{
"cvssV3_0": {
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"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R",
"version": "3.0"
}
},
{
"cvssV2_0": {
"baseScore": 5,
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR",
"version": "2.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-670",
"description": "Incorrect Control Flow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-20T05:15:12.337Z",
"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-358243 | lm-sys fastchat Arena Side-by-Side View add_text control flow",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/vuln/358243"
},
{
"name": "VDB-358243 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/vuln/358243/cti"
},
{
"name": "Submit #792228 | LM-Sys FastChat \u003c= 0.2.36 Content Moderation Bypass (CWE-670)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/792228"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/lm-sys/FastChat/issues/3834"
},
{
"tags": [
"exploit"
],
"url": "https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36"
},
{
"tags": [
"product"
],
"url": "https://github.com/lm-sys/FastChat/"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-19T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-04-19T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-04-19T18:04:52.000Z",
"value": "VulDB entry last update"
}
],
"title": "lm-sys fastchat Arena Side-by-Side View add_text control flow"
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-6608",
"datePublished": "2026-04-20T05:15:12.337Z",
"dateReserved": "2026-04-19T15:59:43.122Z",
"dateUpdated": "2026-04-20T05:15:12.337Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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