CVE-2026-65627 Affecting erlang-jose package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 Oct 2026
- disclosed26 Oct 2026
Introduced: 26 Oct 2026
NewCVE-2026-65627 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest erlang-jose.
NVD Description
Note: Versions mentioned in the description apply only to the upstream erlang-jose package and not the erlang-jose package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in potatosalad jose (erlang-jose) allows a remote attacker to exhaust a node's memory with a small crafted JWE token.
The jose_jwe_zip:uncompress/2 function in src/jwe/jose_jwe_zip.erl decompresses the DEFLATE-compressed plaintext of a JWE that carries the optional zip: DEF header by calling zlib:inflate/2 on the entire attacker-controlled stream, with no bound on the output size or the inflation ratio. Raw DEFLATE reaches ratios around 1000:1 on highly repetitive input, so a few-kilobyte token inflates to hundreds of megabytes or gigabytes in a single call.
Decompression runs automatically during decryption through jose_jwe:block_decrypt/2 (JOSE.JWE.block_decrypt/2 in Elixir), before the recipient can inspect or reject the payload. With the common asymmetric key-management algorithms (RSA-OAEP, ECDH-ES) an attacker needs only the recipient's public key to craft such a token, so no authentication or secret material is required. A single small token can exhaust the node's memory and crash the BEAM, denying service to all users.
This issue affects jose: from 1.0.0 before 1.11.13.
References
- https://advisory.echohq.com/cve/CVE-2026-65627
- https://cna.erlef.org/cves/CVE-2026-65627.html
- https://github.com/potatosalad/erlang-jose/commit/857eb8e7f2d33e2c9ca2189e77226561cacaf2ad
- https://github.com/potatosalad/erlang-jose/commit/a7746ecd4950f85a393136e449a91dac62b5c429
- https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-wfpv-qxp8-x5gm
- https://osv.dev/vulnerability/EEF-CVE-2026-65627