CVE-2026-87734 json
Out of order segment reassembly allows remote denial of service
published 3mo ago modified 5d ago also EUVD-2026-74620 , OSEC-2026-11
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
An issue was discovered in the utcp package before 0.0.6 for OCaml. Out-of-order segment reassembly allows remote denial of service.
Patch / fix
- opam utcp 0.0.6
- OCaml utcp 0.0.6
Is CVE-2026-87734 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- osv.dev https://osv.dev/vulnerability/OSEC-2026-11 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| opam | utcp | <0.0.6 |
0.0.6 |
Affected products
- OCaml utcp
Classification
- Weakness
-
- CWE-923 Improper Restriction of Communication Channel to Intended Endpoints
References
Sources
- CVE List CVE-2026-87734
- NVD CVE-2026-87734
- OSV OSEC-2026-11
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