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TI-2025-18605 Aliases CVE-2025-24903

libsignal-service-rs Doesn't Check Origin of Sync Messages

Priority LOW 36CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user. The origin of sync messages is not checked. Patched libsignal-service can be found after commit 82d70f6720e762898f34ae76b0894b0297d9b2f8. The `Metadata` struct contains an additional `was_encrypted` field, which breaks the API, but should be easily resolvable. No known workarounds are available.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-07
Fix Fixed libsignal-service-rs (whisperfish): 82d70f6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
whisperfishlibsignal-service-rsbefore 82d70f682d70f6Patch availableCNA
  • libsignal-service-rs Vendorwhisperfish Affected before 82d70f6 Fixed in 82d70f6 Patch available CNA

Remediation

  • Fix · CNA libsignal-service-rs (whisperfish) Fixed in 82d70f6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-24903

References

Other 2

  • TI-2024-26620 phonenumber panics on parsing crafted phonenumber inputs CVSS 3.1HIGH 8.6
  • TI-2023-22609 phonenumber panics on parsing crafted RF3966 inputs CVSS 3.1HIGH 8.6
  • TI-2023-22612 blurhash panics on parsing crafted inputs CVSS 3.1HIGH 8.6
  • TI-2025-18606 libsignal-service-rs doesn't sanity check plaintext envelopes are not sanity-checked CVSS 3.1HIGH 8.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences