CVE-2026-44288
CVE-2026-44288 is a medium-severity vulnerability in Protobufjs Project Protobufjs with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-176.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- EPSS exploit prediction: 0% (22nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-30026
- Weakness: CWE-176
- Affected product: Protobufjs Project Protobufjs
- Published:
- Last modified:
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.
Frequently asked questions
- What is CVE-2026-44288?
- protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.
- How severe is CVE-2026-44288?
- CVE-2026-44288 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-44288 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-44288?
- CVE-2026-44288 affects Protobufjs Project Protobufjs. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-44288?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-44288 have an EU (EUVD) identifier?
- Yes. CVE-2026-44288 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30026.
- When was CVE-2026-44288 published?
- CVE-2026-44288 was published on 2026-05-13 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
More vulnerabilities in Protobufjs Project Protobufjs
- CVE-2026-41242 — Critical (CVSS 9.8): protobufjs compiles protobuf definitions into JavaScript (JS) functions. In versions prior to 8.0.1 and 7.5.5,…
- CVE-2023-36665 — Critical (CVSS 9.8): "protobuf.js (aka protobufjs) 6.10.0 through 7.x before 7.2.5 allows Prototype Pollution, a different vulnerability…
- CVE-2026-44293 — High (CVSS 8.8): protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated…
- CVE-2022-25878 — High (CVSS 8.2): The package protobufjs before 6.11.3 are vulnerable to Prototype Pollution which can allow an attacker to add/modify…
- CVE-2026-44291 — High (CVSS 8.1): protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used…
- CVE-2026-48712 — High (CVSS 7.5): protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.1 and 8.4.1, protobufjs could…
All CVEs affecting Protobufjs Project Protobufjs →
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