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Rainbow Six Siege: Y10S4.2 Patch Notes (Jan 19, 2026): what changed
Rainbow Six Siege: Y10S4.2 Patch Notes was published on Jan 19, 2026 and includes 5 buffs, 1 nerf, 11 adjustments and 8 fixes.
TL;DRThis update buffs Jackal, Lion and Maestro and has both buffs and nerfs for Thorn. It also lists bug fixes from the official notes.
Who this matters to
Jackal players
Jackal is buffed in this update; the exact values are listed below.
Lion players
Lion is buffed in this update; the exact values are listed below.
All 25 changes
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Thorn's: reduced activation time for faster response.
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Reduced activation time for faster response.
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Thorn's: Increased Shells quantity to allow more coverage and reactive placement.
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Increased Shells quantity to allow more coverage and reactive placement.
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Thorn's: Slightly reduced lethal range in exchange for quicker detection-to-trigger timing.
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Slightly reduced lethal range in exchange for quicker detection-to-trigger timing.
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Thorn's: Added a 15-second survivor penalty that adds bleed and slows movement, similar to Frost's Welcome Mats when self-removed.
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Added a 15-second survivor penalty that adds bleed and slows movement, similar to Frost's Welcome Mats when self-removed.
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Razor Bloom Shells
Thorn's Razor Bloom Shells: damage.
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Damage
Nerf
Razor Bloom Shells · Max damage
Thorn's Razor Bloom Shells max damage decreases from 180 to 125.
Max damage180125This is a nerf
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Max damage: 125 (was 180)
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Razor Bloom Shells
Thorn's Razor Bloom Shells: max damage zone: 0m-1m from center.
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Max damage zone: 0m-1m from center
Buff
Razor Bloom Shells · Activation time after deployment
Thorn's Razor Bloom Shells activation time after deployment decreases from 5s to 1s.
Activation time after deployment5s1sDirection not stated
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Activation time after deployment: 1s (was 5s)
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Razor Bloom Shells
Thorn's Razor Bloom Shells: Detection and explosion range: 4m.
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Detection and explosion range: 4m
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Razor Bloom Shells
Thorn's Razor Bloom Shells: Slowdown and bleed debuff after being hit: 15s.
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Slowdown and bleed debuff after being hit: 15s
Capitao
Adjust
Fire burn duration
Capitao's fire burn duration increases from 10s to 13s.
Fire burn duration10s13sDirection not stated
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Increased fire burn duration to 13s (was 10s).
Lion
Buff
Scan duration
Lion's scan duration increases from 2s to 3s.
Scan duration2s3sDirection not stated
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Increased scan duration to 3s (was 2s).
Maestro
History · 2 patches →Buff
Evil Eye battery life
Maestro's Evil Eye battery life increases from 6s to 8s.
Evil Eye battery life6s8sDirection not stated
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Increased Evil Eye battery life to 8s (was 6).
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Maestro's: Also affects the recharge duration since they are the same value.
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Also affects the recharge duration since they are the same value.
Jackal
History · 2 patches →Buff
Scanning range
Jackal's scanning range increases from 8m to 12m.
Scanning range8m12mThis is a buff
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Increased scanning range to 12m (was 8m).
UMP45
Buff
Damage
UMP45's damage increases from 38 to 42.
Damage3842This is a buff
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Increase damage to 42 (was 38).
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UMP45's: Improved lateral recoil.
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Improved lateral recoil.
Gameplay
History · 13 patches →Fix
Fixed: Operators are detected outdoors when navigating in 2F Courtyard Corridor on the Fortress map.
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FIXED - Operators are detected outdoors when navigating in 2F Courtyard Corridor on the Fortress map.
Fix
Fixed: AI Operators get stuck and fail to pick up the defuser when it's dropped at the base of a long staircase on any map.
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FIXED - AI Operators get stuck and fail to pick up the defuser when it's dropped at the base of a long staircase on any map.
Fix
Fixed: AI Operators can continuously use contextual pings with no cooldown.
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FIXED - AI Operators can continuously use contextual pings with no cooldown.
Fix
Fixed: PMR90A2 marksman rifle has no maximum firing capacity on vertical recoil.
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FIXED - PMR90A2 marksman rifle has no maximum firing capacity on vertical recoil.
Fix
Fixed: EMP can't deactivate the metal detectors in 1F Reception on the Kanal map.
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FIXED - EMP can't deactivate the metal detectors in 1F Reception on the Kanal map.
Level Design
History · 6 patches →Fix
Fixed: Chests in front of a desk block it from being vaulted in 2F Commander's Office on the Fortress map.
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FIXED - Chests in front of a desk block it from being vaulted in 2F Commander's Office on the Fortress map.
User Experience
History · 14 patches →Fix
Fixed: Players can't navigate the Report Player side panel while in game.
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FIXED - Players can't navigate the Report Player side panel while in game.
Fix
Fixed: Missing weapon handling SFX when performing a melee.
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FIXED - Missing weapon handling SFX when performing a melee.
Related changes in Rainbow Six Siege
Structured by Nerf Radar from the official notes (parsed automatically and reviewed by hand). Backfilled Oct 21, 2026 from the official notes: parser output only (no hand edits); labels follow the numbers or explicit wording, unclear lines are held for review. Source: store.steampowered.com · fetched Oct 21, 2026.