CVE-2026-21619
Unsafe Deserialization of Erlang Terms in hex_core
- Published
- Updated
- Reserved
- Assigned by
- EEF
Description
Uncontrolled Resource Consumption, Deserialization of Untrusted Data vulnerability in hexpm hex_core (hex_api modules), hexpm hex (mix_hex_api modules), erlang rebar3 (r3_hex_api modules) allows Object Injection, Excessive Allocation. This vulnerability is associated with program files src/hex_api.erl, src/mix_hex_api.erl, apps/rebar/src/vendored/r3_hex_api.erl and program routines hex_core:request/4, mix_hex_api:request/4, r3_hex_api:request/4. This issue affects hex_core: from 0.1.0 before 0.12.1; hex: from 2.3.0 before 2.3.2; rebar3: from 3.9.1 before 3.27.0.
Timeline
ID reserved
By EEF
- 57 days later
· 57 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| EEFCNA (assigner) | 4.0 | Low2.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| NVDNVD · Modified | 4.0 | Low2.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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 |
- EPSS (exploitation in 30 days)
- 0.64% · top 49% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.0.
Weakness
Affected products
- affected eb327f8edfe45507351e38cc0805aa12fa647f0b – < cdf726095bca85ad2549d146df1e831ae93c2b13
- affected 0.1.0 – < 0.12.1
- affected 314546ac432229518714cc8e3336e916b9da6305 – < 636739f3322514e9303ca335fb630696fcbb3c95
- affected 2.3.0 – < 2.3.2
- affected 209c02ec57c2cc3207ee0174c3af3675b8dc8f79 – < 1d4478f527e373de0b225951e53115450e0d9b9d
- affected 3.9.1 – < 3.27.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Hexhex_coreGHSA-hx9w-f2w9-9g96 (opens in a new tab)
References (6)
- https://github.com/hexpm/hex_core/security/advisories/GHSA-hx9w-f2w9-9g96 (opens in a new tab)vendor-advisoryrelated
- https://cna.erlef.org/cves/CVE-2026-21619.html (opens in a new tab)related
- https://osv.dev/vulnerability/EEF-CVE-2026-21619 (opens in a new tab)related
- https://github.com/hexpm/hex_core/commit/cdf726095bca85ad2549d146df1e831ae93c2b13 (opens in a new tab)patch
- https://github.com/hexpm/hex/commit/636739f3322514e9303ca335fb630696fcbb3c95 (opens in a new tab)patch
- https://github.com/erlang/rebar3/commit/1d4478f527e373de0b225951e53115450e0d9b9d (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-hx9w-f2w9-9g96 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-21619)Record last updated .