CVE-2026-0994
Publication date 23 January 2026
Last updated 30 June 2026
Ubuntu priority
Description
A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages. Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| protobuf | 26.04 LTS resolute |
Fixed 3.21.12-15ubuntu1
|
| 25.10 questing |
Fixed 3.21.12-11ubuntu3.1
|
|
| 24.04 LTS noble |
Fixed 3.21.12-8.2ubuntu0.3
|
|
| 22.04 LTS jammy |
Fixed 3.12.4-1ubuntu7.22.04.6
|
|
| 20.04 LTS focal |
Fixed 3.6.1.3-2ubuntu5.2+esm3
|
|
| 18.04 LTS bionic |
Fixed 3.0.0-9.1ubuntu1.1+esm4
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
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CVSS version:
Base score
8.2 · High
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Base score
7.5 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8063-1
- Protocol Buffers vulnerability
- 25 February 2026
- USN-8063-2
- Protocol Buffers vulnerability
- 26 May 2026