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01 Record

CVE-2026-0994

Denial of Service in Python Protobuf

HighPUBLISHEDCNA: Google
CNA base score8.2 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
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02 Description

Denial of Service in Python Protobuf

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.71% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 53.3% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Modified. NVD last modified this record on 2026-09-01.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-01-23 14:55Z9 MO AGO
Last updated
2026-09-01 12:04Z1 MO AGO
Reserved
2026-01-15
Assigning CNA
Google
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS 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
Weaknesses
Data version
5.2
Document digest
3e64849ff92d2d9ee9c2f20139690e7a280265c62886530ac5841f825182b432

05 Affected products

VendorProductVersionsPlatforms
PythonProtobuf<=v33.4—

06 References

07 Fixed in

AlmaLinux 9

  • protobuf
    Fixed in 3.14.0-17.el9_7
  • protobuf-compiler
    Fixed in 3.14.0-17.el9_7
  • protobuf-devel
    Fixed in 3.14.0-17.el9_7
  • protobuf-lite
    Fixed in 3.14.0-17.el9_7
  • protobuf-lite-devel
    Fixed in 3.14.0-17.el9_7
  • python3-protobuf
    Fixed in 3.14.0-17.el9_7

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • protobuf
    Fixed in 3.19.6-15.el10_1
  • protobuf-compiler
    Fixed in 3.19.6-15.el10_1
  • protobuf-devel
    Fixed in 3.19.6-15.el10_1
  • protobuf-lite
    Fixed in 3.19.6-15.el10_1
  • protobuf-lite-devel
    Fixed in 3.19.6-15.el10_1
  • python3-protobuf
    Fixed in 3.19.6-15.el10_1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • protobuf
    Fixed in 3.14.0-17.el9_7
  • protobuf-compiler
    Fixed in 3.14.0-17.el9_7
  • protobuf-devel
    Fixed in 3.14.0-17.el9_7
  • protobuf-lite
    Fixed in 3.14.0-17.el9_7
  • protobuf-lite-devel
    Fixed in 3.14.0-17.el9_7
  • python3-protobuf
    Fixed in 3.14.0-17.el9_7

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • protobuf
    Fixed in 3.19.6-15.el10_1
  • protobuf-compiler
    Fixed in 3.19.6-15.el10_1
  • protobuf-devel
    Fixed in 3.19.6-15.el10_1
  • protobuf-lite
    Fixed in 3.19.6-15.el10_1
  • protobuf-lite-devel
    Fixed in 3.19.6-15.el10_1
  • python3-protobuf
    Fixed in 3.19.6-15.el10_1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • protobuf
    Fixed in 3.21.12-3+deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • protobuf
    Fixed in 3.21.12-11+deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • protobuf
    Fixed in 3.21.12-16

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • protobuf
    Fixed in 3.12.4-1ubuntu7.22.04.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • protobuf
    Fixed in 3.21.12-8.2ubuntu0.3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • protobuf
    Fixed in 3.21.12-11ubuntu3.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • protobuf
    Fixed in 3.21.12-15ubuntu1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • protobuf
    Fixed in 3.21.12-15ubuntu1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • protobuf
    Fixed in 3.0.0-9.1ubuntu1.1+esm4
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • protobuf
    Fixed in 3.6.1.3-2ubuntu5.2+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.