CVE-2026-102557
A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- EPSS
- 0.27% probability · 20th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- gnome/libsoup · redhat/enterprise linux
- Source
- secalert@redhat.com
EPSS moved from 0.2% on 30 September 2026 to 0.3% on 26 October 2026.
References
- https://access.redhat.com/errata/RHSA-2026:83384Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:83618
- https://access.redhat.com/errata/RHSA-2026:84586
- https://access.redhat.com/security/cve/CVE-2026-102557Mitigation, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2543231Issue Tracking, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.