What’s Vulnerable › Vulnerabilities

CVE-2025-24904: libsignal-service-rs doesn't sanity check plaintext envelopes are not sanity-checked

• Severity: high (CVSS 8.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-13 · updated 2026-06-17
• Weakness: CWE-74

Description

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, plaintext content envelopes could be injected by a server or a malicious client, and may have been able to bypass the end-to-end encryption and authentication. The vulnerability is fixed per 82d70f6720e762898f34ae76b0894b0297d9b2f8. The `Metadata` struct contains an additional `was_encrypted` field, which breaks the API, but should be easily resolvable. No known workarounds are available.

Affected products

• whisperfish libsignal-service-rs: before 82d70f6720e762898f34ae76b0894b0297d9b2f8

References

• https://github.com/whisperfish/libsignal-service-rs/commit/82d70f6720e762898f34ae76b0894b0297d9b2f8
• https://github.com/whisperfish/libsignal-service-rs/security/advisories/GHSA-hrrc-wpfw-5hj2

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