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CVE-2026-6608

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ee82825c25cfd98d7bde9824fddc5661431b5d44e5940bd0b180173af783e092
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 4 assertions

{"metric":{"baseScore":5.3,"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"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/2/cvssV3_0

{"metric":{"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"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/3/cvssV2_0

{"metric":{"baseScore":5.3,"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"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"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…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":5.3,"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"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/2/cvssV3_0
{"metric":{"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"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/3/cvssV2_0
{"metric":{"baseScore":5.3,"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-670","description":"Incorrect Control Flow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"tags":["exploit"],"url":"https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/4
{"tags":["product"],"url":"https://github.com/lm-sys/FastChat/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/5
{"tags":["issue-tracking"],"url":"https://github.com/lm-sys/FastChat/issues/3834"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/3
{"name":"Submit #792228 | LM-Sys FastChat <= 0.2.36 Content Moderation Bypass (CWE-670)","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/792228"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/2
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/0
{"name":"VDB-358243 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/358243/cti"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d8cfee024a1c8faebd85a383d37e922bfafe578a47802c7a157576356a57e6b · sha256:194e245eb952d9a3… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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