Red HatCVE-2026-12478
Red Hat Enterprise Linux: integer overflow
Medium4.8CVE-2026-12478 · Published Jul 14, 2026 · updated Sep 16, 2026
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 9 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-125
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 14 | A flaw was found in libsoup's WebSocket implementation | High7.5 | No fix yet |
| Jul 14 | Red Hat libsoup: denial of service | High7.5 | No fix yet |
| Jul 14 | Red Hat libsoup: denial of service | Medium5.9 | No fix yet |
| Jul 14 | Red Hat libsoup: out-of-bounds read | Medium6.5 | No fix yet |
| Jul 14 | Red Hat Enterprise Linux 10: denial of service | Medium5.9 | No fix yet |
| Jul 14 | Red Hat open5gs: out-of-bounds read | High8.6 | No fix yet |