feat: SCTP signaling improvements for reliable connection establishment

F-TELEGRAM-IOS-TGCALLS-SIGNALING-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

TelegramMessenger/tgcallsReported fixTelegramMessenger/tgcalls

feat: SCTP signaling improvements for reliable connection establishment

fixed publicly (upstream tgcalls)

details

Finding IDs: F-TELEGRAM-IOS-TGCALLS-SIGNALING-001
Status: fixed publicly (upstream tgcalls)
Reported via: Telegram security contact
Note: public tgcalls commit 24fd51b on 2026-04-15 adds SCTP signaling reliability fixes, including writable gating and timer backoff bounds. Telegram iOS later pulled a tgcalls submodule revision that includes this fix.

F-TELEGRAM-IOS-TGCALLS-SIGNALING-001: Resource limits. The recorded signaling change bounds timer backoff and gates writes; it is not independent proof of the report-to-fix mapping. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-TELEGRAM-IOS-TGCALLS-SIGNALING-001

Security area (1seal assessment): Availability. Bounded retry timing and write gating concern signaling availability; this does not independently confirm the report-to-fix mapping. Reviewed 24 Sep 2026.

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